Apr 292011

Well, the antenna I tuned up in my last post, I can say, while it doesn’t work that great on 80m, it did get a contact into Victoria this evening on the AWNOI net.  Terry VK2TEZ near Coffs Harbour gave me a 4-3 signal report, so still lots of room for improvement… part of that was due to static crashes from storms in NSW, but I think with a better tuned antenna, we should be able to get towards having a workable antenna.  At the moment the autotransformer I use has ~95 turns, with output taps at 0, 25, 50 and 75 turns.  I think one somewhere between 0 and 25, and/or some extra turns might help… so I might wind a new one and see where that gets us.

The headlight still continues to give me grief.  An interesting discovery though this evening.  Since the battery is no good, I’ve permanently mounted it to the bicycle frame.  This was achieved by removing the plastic bracket which is used to mount the headlight on the handlebars or on the helmet mount (using a rubber O-ring), and replacing this with a bracket bent out of a short piece of aluminium.  It fastens to the bicycle frame at the front right above the front wheel, using a bolt hole normally used for mounting rim brakes (my bike has disc brakes).

The upshot is that the headlight’s casing has a pretty good electrical connection to the bicycle frame.  Turns out this is a big no no with these lights.  Kiss goodbye HF if you do… you’ll get crap everywhere from 400kHz right up into the VHF.  I’ll have to do some further investigation, but I found that if I insulated the case from the frame, it helped on the 400kHz and HF emissions.  I think something parasitic is causing the 2m grief as this continues (that, or it’s less critical on the case being earthed).

For a while I thought it might’ve been something lurking around 415kHz… the standard IF frequency of most superhetrodyne receivers, but alas, can’t see anything there.  Otherwise it’d explain why it appears to be everywhere.  I definitely suspect it’s not supposed to be oscillating there though, so I think parasitic oscillations are the cause here.  I’m slowly researching my own power supply for the LED in this headlamp, so its days are numbered.

The insulation was achieved by breaking a cheap plastic picnic knife, drilling a couple of mounting holes, and mounting the headlight on that.  That quelled the HF interference quite a bit, and I was able to listen to the HF bands on my way into Brisbane.  At least it was nice to listen to something other than that sodding wedding in the UK.  (C’mon fellas, yes, great and all but can’t we just confine it to one station?)

I was concerned about the longevity of this arrangement however.  And as it turned out, I was right to be concerned.  It broke as I approached the Normanby Fiveways.  I went over a bump, heard a crack, and noticed the headlight dangling by the power lead.  I pulled over, threw it in the basket and grabbed the backup headlight.  At least there was one on the helmet, a 1W LED, so I still complied with local laws for night riding.  I didn’t have a mounting for the backup light, I just pointed it forward sitting in the bottom of the front basket, with it on flash as a warning to drivers.

Once at the destination, I reverted the headlight back to being directly mounted on the bicycle frame.  Interference was intermittent, but when it was acting up, it did wipe out 80m with S6 noise.  Not good when most stations are barely making S6 as it is.  I wound up turning off the main headlamp as for the most part I could see where I was going, and I knew the route.  As I got out of town this was less of an issue due to the lack of traffic, and of course I was on bicycle paths or the footpath for 90% of it.  That at least allowed me to hear what was going on with the net.

The other flaw I had was that the helmet’s speaker connections were acting up… wound up unplugging the earpiece side of the headset adaptor and using the internal speaker.  Thankfully I could still use the helmet’s microphone and the rest of the wiring harness… just not the speakers in the helmet.  I noticed this as I pulled out of my street, in fact I was aware there was a problem, but now I know where the problem is now.  I’ll get onto it tomorrow.  And I’ll look at a better way to mount this headlamp in an insulated fashion as an interim solution to a power supply replacement.

Apr 172011

If you ever decide to put any kind of sensitive receiver on a bicycle, you’ll want to avoid this ugly duckling of the bicycle lighting world:

Nitelights Illuminator 900

Nitelights Illuminator 900

These lights are great from the illumination point of view, and they’re not badly priced either.  However, from an EMC viewpoint, they stink.  I was given one as a present some time ago.  The first night I got it, I mounted it on the helmet, charged up its battery, then went to work the next day.  That evening, tried using the radio on the bicycle as I rode home.  The interference rendered the radio totally useless.

At first I couldn’t figure out why the signals sounded so bad on receive.  I was stuggling to hear repeaters that were normally quite strong.  The only thing that was new was the headlight.  I got home, switched on the set in my room and tuned to 2m sideband, then put the headlight on flash.  The tell-tale static from the radio gave away the headlight as being the culprit.  Worst of all, the emissions weren’t conducted, they were radiated.

Since then I’ve spent the last few months trying to figure out ways to make this headlight less noisy.  The following page serves as a notepad, and I’ll keep adding to this as time goes on.

Initially when I used it I kept the battery in my shirt pocket.  This proved to be a fatal mistake, since the roughly ¼? power cable proved to be a very effective radiator of this interference.  I found winding the power lead up into a tight coil and moving the battery to the top of the helmet right behind the headlight helped things a bit.  Adding a 2.2mF capacitor in parallel to the headlight further reduced emissions to make it barely tollerable.

Then the battery pack died.  After a few weeks of non-usage, the cells collapsed.  So for a while the problem solved itself, I could no longer use the headlight.  The headlight’s battery pack runs at a nominal 7.2V (typical 8V).  Since I run a 12V supply on the bicycle, I set about making a step-down power supply that could drop my 12V supply down to 8V approximate to run the headlight.

Initially I tried using a LM7808 linear reg.  This worked, with one major drawback: the linear reg got bloody hot.  Turns out this headlight draws about 1A of current when at full brightness.  That means in order to drop 4V, the reg was dissipating 4W of power.  Ooops!  Poor thing.

I designed a crude switchmode power supply to do the work.  Using a voltage divider to provide a voltage reference, I used a LM311 comparator to detect when we were under voltage.  The output signal from this would pull down on the gate of a IRF9540N MOSFET which acted as the main switch.  Hysteresis was used to fine-tune the switching behaviour.  Capacitors at both sides would smooth the waveform.  470µF was used on the input side, 330µF on the output (we still have that 2.2mF capacitor not far away).  I also made liberal use of 100nF decoupling capacitors to try and control the rate of switching.

On the breadboard with a dummy load, my circuit performed pretty well.  A fairly smooth output with a bit of ripple at high load.  I mounted it in a box and tested it with the headlight, and presto, the headlight was back in service.  I mounted both on the bicycle directly, so as to minimise cable length and therefore radiation.

Since now the radio shared a power rail with the light, I knew there was potential for conducted emissions to cause problems as well as radiated.  The next evening I tried it out… 2m was lousy with the headlight turned on.  The good news is that it wasn’t much worse than before, but it still rendered the radio useless at times, particularly if the signal was weak from the repeater.

Recently, I added some 470µH inductors in series with the headlight and my switchmode power supply.  I also tried common-mode chokes to no avail.  A 1mF capacitor has been added in parallel to the 470µF capacitor in my power supply to further try and reduce the noise.

Low-pass filtering on headlight

Low-pass filtering on headlight: 2.2mF capacitor in parallel, 470µH inductor in series

Part of the problem was that I was shooting blind to try and find the interference.  Today, whilst tuning up the HF antenna, I decided to experiment and see what bands this headlight had an influence on.  To my (unpleasant) surprise, interference was severe right down to 80m.  I used the spectrum analyser built into the FT-897D to hunt for the culprit, and found it lurking at around 400kHz.  When the power supply initially starts up, it’ll be up around there, then it sinks down to 392kHz as the case warms up:

Noise from the headlamp detected around 400kHz

Noise from the headlamp detected around 400kHz

This appears to be the fundamental frequency for the switchmode power supply built into the headlamp.  It would appear to have a fairly sharp square-wave type pulse, as it contains very strong odd-order harmonics.  The same interference can be observed at around 1260kHz (3rd harmonic).

The fact that this frequency is so low, probably suggests it is being intermodulated with a parasitic oscillation at some higher frequency.  This I have not yet found, the CRO showed some other hash over the signal, but I will need to do some further investigation, probably with a more sophisticated spectrum analyser than the primitive one found in my transceiver.

I’d be interested to hear from others who have had issues with these headlamps.  In particular, interference to AM/FM radio reception or transceiver operation would be quite useful if the need to persue this with the ACMA ever comes up.  The manufacturer of the headlights has so far been unresponsive to my queries, so in the meantime I can only recommend that people avoid using these headlights if they intend to use any kind of radio receiver whilst riding at night.

In the meantime, I’ll be chucking further notes here as I find more on this issue.

Apr 172011

Well, I figured I better post up pics and notes on the improved antenna design for my HF bicycle mobile station.  I spent some time tuning it up today, and without resorting to the autotuner, I’ve successfully managed to tune up all bands available to me from 40m through to 6m.  80m still remains ellusive however.

The new design incorporates a version of the autotransformer used in the earlier attempt, using more turns of wire on the same size former, and multiple output tap points.  This allows me to accomodate a very wide turns ratio to match the antenna to various bands.

VK4MSL/BM HF: The autotransformer

VK4MSL/BM HF: The autotransformer


Band Test Frequency Primary turns Secondary turns Approximate SWR Comments
80m 3.590MHz 1 90 Too high to measure This seems to get the strongest signals. Autotuner is able to tune from here.
40m 7.120MHz 26 48 ~2:1 +/- a turn on the secondary to cover the entire 40m band.
20m 14.210MHz 26 1 ~1.2:1
15m 21.200MHz 26 27 ~1.4:1 Slightly out, there is probably a better one.
10m 29.200MHz 26 27 ~1.1:1
6m 53.000MHz 26 52 ~1.2:1 +/- a turn on the secondary, able to hit VK4RBX with 10W from the driveway


On the top of the autotransformer are for selecting the secondary tap; one of 0 turns, 25 turns, 50 turns or 75 turns (caveat; I might be slightly out with my counts here).  Having done this I think in hindsight I’d have been better off moving the 0t one down to maybe 10t instead, as there aren’t too many bands that seem to work on the 0t setting.  The primary side is selected by means of a wire soldered on to a thumbtac.  The wire wraps around the tube with a piece of balsa wood for the pin to stick into.  You select the turn by piercing the insulation as you push the thumbtac through the wire and into the balsa wood behind.  Crude, but it works.

VK4MSL/BM HF: Primary tap

VK4MSL/BM HF: Primary tap

In place of the CB whip, I have taken a fibreglass whip and cut it down, stripped the winding, and used it as a support with a base-load spring to take any shock loads.  In place of the original antenna winding, is two sections of brass tubing which telescope out.  This allows for an antenna that can be partially dismantled and reassembled on the run, unlike the other antenna which was permanently fixed at 6′ length.



I have a third solid section I can insert in there too, which would further extend the antenna to 2.5m, but it becomes very top heavy when I do this.  The antenna can extend to 1.6m length, or for portable use I can throw a wire up into a tree, or support it using a squid pole and connect that wire to the autotransformer output taps.

I didn’t make any contacts while tuning the thing up, although I was hearing New Zealand on 20m quite strongly, and on 10m I could hear the VK8 (Northern Territory) beacon going quite well.  I tried a few calls on 28.390MHz, but had no contacts.


I’ve also re-inforced the antenna bracket.  Prior to doing this the antenna would sway wildly from side to side.  Yes, it meant the cars gave me a wide birth (something I greatly appreciate) but I fear had adverse affects on the signal, and probably was asking for trouble in the long run.  Putting a brace between the two brackets seems to steady things up just a little bit, and now I can rock the bike side-to-side quite violently without the antenna swinging too far.

I’m yet to go mobile with the new improved station.  Weather permitting, I shall give it a try Monday evening.  I have a meeting with Brisbane area WICEN.  Due to headlight QRM I may or may not be active while mobile, we’ll give it a shot, but I should be able to work portable once I get there.

Mar 092011

For a little bit I’ve been struggling with poor performance on my bicycle mobile station.  It was an intermittent fault.  Sometimes it’d work great, other days the FT-290R II would complain bitterly about a SWR issue, and receive performance would be abysmal.  But then I’d set off anyway, get a block away, and the problems just disappeared.  Or the thing would be working perfect, and I’d get down the road and it’d stop working.

Damn frustrating.  Intermittent faults such as these are the worst kind to try and locate.  I thought of all kinds of possibilities, but the one thing I hadn’t considered was the antenna.

Performance had been pretty patchy ever since the weekend before LCA.  It was on the Saturday that somewhere between Annerley and Milton, I lost the ¼ wavelength stainless-steel whip that I had been using.  So I spent that evening rigging up a SO-239 socket so that I could use the commercial antenna I had; a Nagoya NL-77BH that I bought at BARCfest in 2008.

I rigged that up, and on the Monday I did successfully make a contact from the bicycle on my way to LCA, but it was patchy.  I did find a few glitches, so fixed those, and Friday I made a contact in the afternoon, but it was still pretty hit-and-miss.  Not the consistent behaviour I got out of my ¼ wave at all.  Okay, maybe the coax is damaged.  Tried different leads, no dice.  Recently I bought a front basket for the bicycle, and so I could put the FT-290RII in there.  Ran coax back to the antenna, last Wednesday afternoon and Thursday morning it worked beautiful.  However Monday it gave me no end of grief.

Suspecting that the weight of the radio pressing down on the BNC terminations may have damaged that section of coax, I grabbed a length of RG195 and terminated it with BNC connectors.  Still no good.  Using the SWR meter in the FT-897D, the impedance match was out by miles.

Today I had another look.  I took the antenna off the bicycle and placed it on a mag-mount antenna base, and placed the base in the centre of an open garage door.  So big ground plane, not much different to most cars.  Checked SWR, still through the roof.  Tuned to the Mt. Cotton repeater on the FT-897D, no signal.  Pulled out a hand-held, perfectly clear 5/8 signal on its original rubber-ducky antenna.  As I was unplugging the antenna base, I watched the signal strength suddenly shoot up and the radio crackle to life when the shield was disconnected (leaving just the centre pin).  I had noticed a dead short before, but thought it was the antenna mount on the bike… something was up.

So, I grabbed a bit of solid copper wire, a PL-259 plug, and some offcut insulation.  I made a new ¼ wavelength antenna, cutting it initially at 60cm.  Swapped it for the NL-77BH and the performance was beautiful.  Check SWR, and yes, it’s high, but then again, 60cm is waay too long.  I estimated about 51cm and folded the wire over at that point, twisting the excess around the body of the antenna.  Signal strength immediately went up two S points, and on checking SWR, it was significantly reduced.  I moved it back to the bicycle where I tweaked it further.

Once happy, I cut off the excess, used pliers to fold the end sharply and soldered the folded end to the body of the antenna to prevent it hooking anything.  Then used some heat-shrink tubing to finish it off so there were no sharp ends to poke eyes out with.  The antenna provides a good match from 144 right through until 148 MHz at 30W using FM.

I haven’t tried a contact on the bike yet, nor have I got any pics to share, but the radios seem happy with it, and it appears to be hitting repeaters in the area once again, including Ipswich.  Given it’s a good 30km between The Gap and Marburg (as the crow flies) with some decent hills to boot, that’s not bad going.

It would appear the additional complexity of these high-gain commercial antennas comes at a significant cost, they don’t like getting shaken to bits on the back of a bicycle.  I’m not sure how repairable the commercial antenna I have is, it may be a case of throw the thing out, at which case I think any love affair I had with commercial mobile whips might be over.  At least my ¼ wave antennas can be made for <$20 in about 10 minutes from parts I can buy in town, versus spending >$50 and having to wait for it to arrive in the post.

Dec 122010

I picked up a few new toys recently.  I’ve been looking around for a small microcontroller based device to act as a combined remote face / DTMF generator for my FT897D.  The idea is that this device could interface with the FT897D via its CAT port, and allow me to adjust the frequency and mode, recalling the information from internal flash or an SD card.

The remote face would then be mounted on the front of the bicycle, and connect to the radio at the rear to allow easy bicycle mobile operation.  An extension of this would be control of a separate 2m radio, and a GPS to allow APRS from the bicycle.

The idea was to have the memory work like a relational database.  Rather than just recalling memory channels, and having a big long list, I could scroll through the repeaters by callsign, location (service area), or combined with GPS, proximity.  Modern flash technology would make this easily doable.

Likewise, for DTMF, rather than having to carry around a cheat sheet or remember IRLP node numbers, wouldn’t it be nice to just be able to scroll through a node list by country/region/callsign, select one, hit the “Call” button, put your callsign across and have it automatically dial the moment you raised the PTT?

I don’t have the ability to manufacture PCBs of the standard required for ICs such as most 32-bit microcontrollers.  SOIC is about as fine as I can muster, and prototyping services are expensive.  Thus I was looking for a stamp module or premade board.

Luminary Micro (now TI) make a few nice ones, and during my work at Laidley, I got to use the LM3S8962 Ethernet/CAN evaluation board.  One nice feature was that it had the JTAG built-in via a FTDI USB-serial chip.  However, the licensing for the board support package irks me — despite their code being useless on anything other than one of their chips, they still see it necessary to modify the BSD license adding a clause that prohibits its use on non-TI microcontrollers.  I had a crack at writing my own “free-software” Stellaris library, but haven’t gotten that far with it.

I happened to stumble on this board based around the STM32F103VET.  They were being sold on eBay for about $60 at the time, so I decided at that price I’d buy three.  ST’s driver library appears to be very liberal in its licensing (in fact they claim there is “no license”, I don’t know if this means “public domain”, or whether I treat it like BSD).

The LCD panel uses the Ilitek ILI9320 display controller with internal graphics RAM, and is capable of 18-bit colour.  The board also features a RTC backup battery, Texas Instruments TSC2046 touchscreen controller and on-board RS232 level converter.  The STM32 also functions as a USB peripheral, and can be programmed using the stm32loader bootloader script via RS232.

Interestingly, the LCD controller documentation states that no part of that documentation may be reproduced without written permission.  I’m not sure if writing an open-source driver classes as “reproducing” the documentation (as I’d be making documented #define statements in C).

The devices come with example source and have a pre-loaded µC-GUI demonstration on them.  So far I’ve managed to distill enough out of these sources to get working touchscreen, LCD and UART.  I’ll probably start looking at FreeRTOS next and seeing if I can get a workable device going.

STM32F103 board

STM32F103 board running a simple "Hello World" app

Hello world application for STM32

Hello world application for STM32

Guess now I had better start planning my application. 🙂

Aug 222010

Well… it seems my tinkering has paid off. This weekend was the weekend of the International Lighthouse Lightship Weekend… and also a federal election.

On Tuesday, I bought a trailer for the bicycle … this is primarily so that I can transport groceries, etc… to home since I’ve got the place to myself for a few weeks and need to be independent. Being so low to the ground, the trailer is hard to see, so I made the decision to move the CB whip over to the trailer, not only does it now radiate a signal, but it also alerts drivers to the trailer’s presence.

I was up to 3AM figuring out how to mount this antenna on the trailer… but eventually I cobbled together a mounting, moved the homebrew autotransformer over, and hey presto… I had nailed the propagation and visibility problems all at once. SWR is still horrid with the CB whip on the trailer, but the autotransformer brings it down to a manageable <15:1 SWR, which the AT-897 can deal with easily.

On the way to the event, I had the station on 14.200MHz… I heard a Chinese station… a BT call, and also later, a New Zealand station. Didn’t make any contacts until I got to the Bulwer Island lighthouse (AU0003) where I made contact with VK5SR, Cape Jaffer Lighthouse (AU0007), registering a weak 53 signal.

On the way home this evening, I first started hunting for a 40m tap on the autotransformer… found one that gave me a 10:1 SWR on 7.080MHz… Okay, not great, but better than the >25 I’d get otherwise.

Around Bardon, I was hearing some VK7 stations, tried to make contact, but I was in amongst their noise floor. As I got to Ashgrove, I tuned around and heard VK3ARK, Cape Liptrap Lighthouse (AU0037). Managed to make contact, and initially registered a 56 signal, but quickly dropped off as I rolled down the hill towards St. John’s Wood… by the time I hit Royal Parade I had dropped off completely. They got that I was mobile, not sure about the bicycle bit… but never mind. 🙂

I travel to the end of the road, trying to put out a few calls, then when I join the bike path I pause, and have a tune around… a very loud signal on 7.145MHz just about blew me away. I listened for a bit as I cycled… it was Gary ZL3SV, in the South Island of New Zealand.

He was in contact with a US station in New Jersey at the time. I could just make out the US station, however Gary just about blew me off the bike… so I waited for a break and called in. 2 others also jumped in… VK4FMVC and VK3BOT. I was barely able to hear VK3BOT, couldn’t hear VK4FMVC (40m can be like that). Gary could hear me though… he was getting me a strong 58 signal. When I checked the S meter briefly, he was registering 59+. This was around 7:00PM (UTC+10).

I was doing 100W at the time… running off a 9Ah SLA battery. I suspect I’d be lucky if even half of that was being radiated by the CB whip… Gary mentioned he was using 200W into a 1500′ centre-fed sloper… undoubtedly an excellent system. I’ll have to see about sending a QSL card over to NZ. As I continued home, there was also a VK6 station that joined us on the frequency, however I didn’t get to make a contact there… and I was nearly home.

I don’t think I’ll make HF a regular habit on the bike, but I’ll consider doing it again sometime. I’ll also see if I can document the setup a bit more… as it’s showing a good deal of promise. This was one contact I really didn’t think I’d be able to make.

Aug 152010

Well… after borrowing an antenna analyser and tweaking a few things… I made my second stationary contact using the bicycle mobile station on 20m.  This time, using 20W transmit power.  I now know where to place at least one of the taps on this autotransformer for 20m use. 😉  The station borrows heavily on the “Wonder Whip” style concept, where an autotransformer provides a means of matching the wild variances in impedance of the antenna, to something reasonable for the radio to cope with.

Shown here, is the station, exactly as it was during this contact.  The fibreglass 6′ CB whip has been spray painted yellow to make it more obvious, I plan to put a flag on there so that it resembles a bicycle safety flag (a big one) so it arouses less suspicion.  Click on any of the photos for a closer view.

VK4MSL/BM HF: as set up during the contact

VK4MSL/BM HF: as set up during the contact

This weekend was the day of the Remembrance Day contest, which is one of the major contests ran by the WIA.  Tuning around on 20m, I heard Kirby VK7KC booming in a S8 from the apple isle.  At first I tried contact with 5W, no dice… then 10W, then 20W… no luck.

I tuned off, and tried a different tap on the autotransformer… bingo, that sounded a bit noisier… I hit the button on the autotuner to clean up any last issues with the SWR, then tuned back and had another go.  Eventually after some perseverance, contact was made.

Below is a shot of the FT897D showing the frequency and S-meter reading shortly after the contact was made…. I was weak into Tassie, but that didn’t matter to me… as far as I was concerned, if I got outside metropolitan Brisbane, I was happy.

FT-897D frequency and S-meter during contact with VK7KC

FT-897D frequency and S-meter during contact with VK7KC

I haven’t yet tried other bands, although I’ve figured out some tap points for 6m, 10m and 15m… and some possible maybe points for 40m although I think the antenna will be very deaf down there.

On 80m it’ll probably be a mostly receive-only antenna, with maybe a Tx range of under 10km… if it’s enough for me to know what’s going on with the AWNOI net before I get home … and to maybe get a message relayed to VK4SD so I don’t get hassled about a late note, it’ll be great. 😉

The transformer still uses a map pin pushed though to select the tap… I’m not sure how well this will go long-term, and I think moving towards using banana plugs (or at the very least, alligator clips) will be a better solution.  Switches are another possibility.  Something that will be a more reliable connection than a pin pushed through a wire.  Shown here, is a close-up of the rear basket, the autotransformer is shown underneath the antenna bracket… which helps provide a bit of capacitance.  I find having it close up against the bracket helps, although I made provisions to be able to hang it vertically too (thereby reducing the coupling).

Rear basket showing homebrew autotransformer

Rear basket showing homebrew autotransformer

For now I’ll probably solder the centre conductor of the coax in place of the map pin, so that it’ll stay put until I can find a more convenient solution.  At least I have something on HF that works to a moderate degree.  I’ll probably give it a try next weekend on my way to the Queensland Maritime Museum, where I’ll be operating the Bulwer Island lighthouse as VK4MM in the International Lighthouse Lightship Weekend.  Hopefully I can stir up 20m sufficiently so that there’ll be some activity when 00:00 UTC rolls around.

Aug 082010

Well, I did some experiments this weekend regarding the bicycle mobile station using an autotransformer to match the shortened end-fed whip (6′ 27MHz helically-wound) to the 50ohm impedance my set demands.

I haven’t tried this on the bike itself… these were done in my bedro^W(ahhem) “radio shack”… with the antenna and its bracket sitting on a wooden chair connected to a longer bit of coax than I’ll probably use on the bike.  I will have to try this on the bicycle (ideally with an antenna analyser) to get a better idea of performance, and the up-coming Remembrance Day contest may provide a good opportunity to gauge performance, as the bands will be sufficiently “busy”.

The autotransformer is a simple design… about 50 turns of cheap speaker wire (~1.5mm diameter; ~0.2mm insulation thickness) on a 42mm OD PVC pipe section about 160mm long.  The pipe has small holes down its length, drilled at a spacing approximately identical to the wire centre-to-centre spacing (2mm).  The two extremes of the coil connect to the antenna and the metal antenna bracket respectively, the latter also connecting to the braid on the coax going back to the radio (about 30cm RG58C/U coax).  The centre conductor of the coax connects to a short piece of wire which is soldered to a small map pin, which is simply pushed through the wire’s insulation, piercing it and poking through the hole in the PVC pipe… I can select any turns ratio from 1:1 to 1:50, achieving a very wide matching ratio.  (On paper, able to match >10kOhm impedances to 50ohm.)

Early testing seems to indicate the ability to obtain good SWR figures on 6m, 10m, 20m and 40m.  80m (the holy grail for me) eludes me… and I suspect the actual radiated signal will be very low down to most stations… but if I can cover parts of metropolitan Brisbane with it, I guess I’m doing okay.  The fact that this antenna got down to VK5 with 100W up it, is a promising sign… perhaps with the autotransformer, it may do better.  Then again, it may do a lot worse… We’ll see.  Plan is to try and get it up and running before the ILLW… so that I can stir up some activity on the bands on my way to the Bulwer Island lighthouse (AU0003) before becoming VK4MM and operating a station there.

Jul 182010

Well, I’ve been riding a lot between West End and The Gap, and I get a lot of questions from people on the band about my setup. I was doing some repairs… one of the wires to the PTT had disconnected, luckily there was a 0V return via other connections… and so while I had the bike outside fixing that (it was too dark in the garage) I took the opportunity to snap some photos.

The light was fading at the time, so the pictures aren’t particularly great… I’ve touched them up to make them brighter, hence there’s a bit of noise in the photo… The last two showing the HF setup, required a flash (which I was trying to avoid due to the aluminum and reflectors)… and of course I didn’t spend time putting the FT-897D in the back… maybe later when I get everything tuned up and actually do make a true bicycle-mobile contact on HF (this one was not made mobile).

VK4MSL/BM on 2m

VK4MSL/BM on 2m: side view

Above, is the station in its entirety… fairly simple. The antenna is a plain 2m ground-plane, formed using a tunable mobile whip cut for 145.700MHz, the aluminum angle bracket makes up one counterpoise, and an additional counterpoise hangs out the back. Adjusting the angle has an influence on the SWR… in this arrangement, it works nicely.

VK4MSL/BM: Closeup of rear basket

VK4MSL/BM: Closeup of rear basket

Shown here is the rear basket where the FT-290R II (or FT-897D for HF) lurks… along with a 9Ah gel cell battery, which also powers the tail light. I haven’t been very neat about the cables. Two leads run from the front controls, the grey one (shielded) carries transmit/receive audio and the PTT, the blue one (Cat5e UTP) carries the four directional buttons — with spare wires connected to 0V. A DB15HD (“VGA”) connector terminates the cable at each end.

VK4MSL/BM: Radio controls

VK4MSL/BM: Radio controls

Remember how I mentioned the hand-mic in the last station was going to be temporary? Well… this is the arrangement here. Shown here is the PTT switch (red) and four directional buttons. Not all radios make use of all buttons … the FT-290R II uses only the up/down buttons, the FT-897D uses the right-hand button in addition for the “fast” button. Homebrew microcontroller-based radios I build will probably use all five shown for a menu interface. There’s no display in front of me, so don’t ask for an accurate signal report, I can tell you whether it’s a Q3 or a Q5, but any S-meter reading will be a wild guess. Future expansion of this may include a small potentiometer for a local volume control, and a small microcontroller-driven LCD that could be used to interface to the FT-897D’s CAT interface… but this is just early days.

Now… I did say I managed to mount a HF antenna on here and make a contact with it. The contact into VK5 that yielded this QSL card was made using a 6′ long CB whip… the station looked a lot like this:

VK4MSL/BM: HF Antenna

VK4MSL/BM: HF Antenna

The flash was needed here, took me a while to figure out where I had put the bracket (I don’t plan to ride with the HF antenna or bracket mounted very often). This is fortuitous in a way since you can now more visibly see the 2m antenna. The CB antenna mounts on a nearly identical bracket. I don’t bother with the radial out the back, as there’s no way I’ll make one long enough that would be practical. The antenna will need some work, in particular, either addition of a base-load coil, or modification, to make it resonant on the amateur bands.

VK4MSL/BM: Closeup of basket with HF mount

VK4MSL/BM: Closeup of basket with HF mount

With a small base-load coil, I should be able to make it a half-wave end-fed on 6m… some more and I should be able to make an end-fed quarter-wave on 10m. This will be the subject of future experiments. This tuning section will probably mount on top of the mounting itself, underneath the spring shown on the right.

And to answer the number one question I get from non-radio amateurs… no… I do not have a camera on my helmet (this is not a camera)… I am not broadcasting video. Kindly don’ t act like someone excited to be on television… you’re not. 😉