Egg Beaters – for the hard of hearing

Posted on December 25, 2023 by webmaster@hamradio.knipmeyer.co.uk

Firstly Merry Christmas ! Its a relaxing day here and not the usual busyness for a Monday! Having an extra two days for the weekend has been really nice, I’ve done loads of other stuff and also playing with IC-9700 with the satellities, or attempting to, would be more accurate 🙂

So far I’ve heard zilch, as in nothing, not a tweet from a ‘bird’ I looked up Amsat’s tracking of sats other had heard, so would be confident that I should be able to hear them too, alas to no avail. I then tried FT8 on 2M, I was getting out just fine with the eggbeaters, but not hearing a thing, I did notice some very high peaks of QRM on the WSJT-X ‘scope’, so my first step was to move the antennas further from the house and a better line of sight of the sky to the horizion, which accomplished, well, nothing.

I then tried SSTV via a my hand held units into the IC9700 and MMSTV, this worked fine, so the 2M antenna was at least receiving and transmitting. I went to 70cm and found a clear frequncy and gave the same SSTV test, this worked fine… so what was going on ? Ok simple test, lets swap antennas between the Diamon X3000 which goes into the Kenwood, put that onto the 9700. Again,

No problem getting out with FT8 and no problem on SSTV. I tried WSPR with 5 watts on all three antennas, the egg beater 2M worked fine.

I then checked thru the IC9700 settings, all good there and used the manual ATT/P.AMP switch on the front of the radio it self, what I noticed was that the internal preamp did increase the signal, but with the external pre-amp there seemed no increase in performance.

What I suspect is happening is that my mast-head pre-amp is designed for a single feed of coax into it, then into a single verticle antenna, where as I have splitters each end for taking the coax and seperating out the 2M and 70cm bands. By the reckoning I can hear local 2m fine (including MB7IPD) on the egg beater, I suspect that the 70cm RX is doing nothing, although the antennas resonent for TX, I think the multiplexer and multiband masthead are not working together correctly.

As its getting dark now, and have the luxury of another day off tomorrow, I will research which sat’s are most common and which band the RX is the most common, then I will setup a single feed for that antenna into the mast-head amp, and run two feeds from the egg beaters, then I should be able to find out if its the egg-beaters/coax/multiplexer causing the lack of ‘ears’.

Until then, 73’s

2E0FWE

Egg beaters – SWR Troubleshooting Dec 2023

Posted on December 24, 2023 by webmaster@hamradio.knipmeyer.co.uk

With no rain and getting the other radios on the air, it was time to tackle the errant SWR on the eggbeater antennas. I lowered the antenna on the tiltbase and with the rigexpert started going thru each connection on the antennas – there are quite a few with the single feedline solution going into the mast head amp, so there is plenty of possiblity for them not to be perfectly coupled/screwed together.

I started with directly connected to the 2m and 70cm eggbeaters, no issue there, SWR was spot on both, almost 1:1 on 2m and around 1.4 on 70cm. I then connected the mast-head triplexer and read the readouts from there, whilst this took some ‘wiggling’ it resulted in getting like-for-like direct readings. I then connected triplexer into the amp and read the output of the amp, the SWR here was higher, but not what i had seen previously, regardless, I re-tighetented all the connectors, this brought the output from the mast head down to the same results as from the output of the triplexer. I then reconnected the feedline from the transceiver back into the amplifier and measured from the far end, again good results. So the issue here was either a single or multiple loose connections. I suspect the the connection between the triplexer and the amp which is a double-barrel male N connector.

I put the title base back up and screwed all the bolts back into the base, feeling my age I was keen to get back into the warmth of the shack !

I measured the SWR from the feedline back into the rigexpert, again good results, so I went ahead and connected another triplexer to split the frequencies out into the 9700 2m and 70cm inputs.

With the results coming from the triplexer looking good i went about reconnecting to the IC-9700. The book-shelf rack proving useful again in getting the coax into the radio easily just by rotating the whole bookcase.

Both 2m and 70cm transmissions from the IC-9700 are looking spot-on – next I will try out getting the amp configured from the 9700 and start testing with some satellities !

Back from Holiday

Posted on December 23, 2023 by webmaster@hamradio.knipmeyer.co.uk

Having had a very nice holiday at the start of the month in Montreux Switzerland I had disconnected all my antennas to ensure no damage to equipment whilst away. With a busy schedule its taken several weeks to get the antennas hooked back up again, but I’m glad to be back on 2m/70cm and HF.

Thanks to the book-shelf shack rack, the anteannas were easy to reconnect for the 7300, Kenwood TM-V71 and CRT6900. I was back on the air monitoring SSTV in no time at all and had a good QSO with OE6XFX on 20m with a good signal report (595) on our transmissions. The 20M SSTV was busy as ever for a Saturday afternoon!

I monitored the Southampton repeater on 70cm and 2M Poole gateway and plenty of activity, was nice to hear some good technical discussions goin on the 70cm repeater in Southampton, was nice to listen in.

I’m hoping for more good weather over the weekend so I can continue work on the eggbeater antennas and looking forward to getting those going on the 9700.

Until then, catch you on the airwaves and 73 !

Egg Beater Pre Amp – Day 2

Posted on November 27, 2023 by webmaster@hamradio.knipmeyer.co.uk

The splendid sunny day of yesterday could of been a whole season away – the weather today (26/11/23), bleak. Drizzle, a slight bit of wind so any gaps in clothing easily penetrated, it was not a good day to be outside, but I wanted to progress the mast head amplifier !

The weather station proving useful – preceptation whilst not heavy, was irritating..

First step was to get the mast down, thankfully the barinco tilt base makes this really easy – having help to raise it first time was ace as getting it into the tilt base is great, but once in its easy enough to do on my own, although my aged bones do struggle with bending over and taking the nuts off. This time out I made note of the different spanner sizes required for each bolt which will be useful in the future.

Having got the antennas down, it was time for some ‘fettling’ on the egg beaters – they was slightly off perfect vertical with the mast, so first thing was to straight them up with the rest of the mast. I also moved the 2m antenna further away from the mast so the radials didnt come into contact with the mast.

With the pre-amplifier installation work completed, I then set about attaching the amplifer to the mast head. I let gravity help here and attached the amp in a way i wasnt fighting it trying to drop off all the time – this worked pretty well. I had some issues with routing the cables internally, but otherwise got the feedline in nicely.

The Ultraflex 10 coax from M&P really looked the business, but it took some ‘convincing’ to go thru the egg beater base. Nothing too aggresive, just a firm push into the radial support, but it did go thru thankfully ! I then had to connect all the relevant ends up, I had pre-ordered some of the connectors I know I would needed but also had plenty to choose from in the shack.

After putting everything together and getting the egg beaters vertical it was time to beat a hasty retreat to the warth and a cup of tea in the shack. The rain wasn’t helping me today !

Once back in the shack I tested the SWR on the Rigexpert sitck, which does the majority of bands, alas today wasn’t to be my day as the SWR reports were not looking good.

With the WX not improving any time soon and a plethora of other things to do (XYL computer upgrades being one of them) I satisifed myself with at least getting the amp on the mast, I willl have to spend some time in investigating and correcting the connectors to find where the issue is !

Still, I’m exicted to be able to start using the egg beaters with an amp, the work will no doubt be worth the effort to pull out those weak signals.

Until then, 73s !

Egg beater Pre-Amps – Day 1

Posted on November 25, 2023 by webmaster@hamradio.knipmeyer.co.uk

It has been a splendid sunny day down here in Bournemouth, whilst the tempretures have been dropping, it was nethertheless a fine day. My original plan was to get essential bits-and-bobs done and out the way, so i could spend the afternoon working on the antennas outside, however the week had caught up with me and a much needed afternoon rest resulted in 2-3 hours lost, but at least I felt better 😀

overnight temps from the now working weather station

Having had a rest I started work on the mast head amplifier, collecting all the parts I had stored away and the dremel, ready for making some holes. I had left my 9700 on 145.500 and was very surprised to hear a call out for a radio check ! Funnily this would be my first ‘ground’ QSO via the egg beater antennas and a good way to check that everything was working as expected. I had a great QSO with M0ABI who was portable in Barton on Sea, given I was using an eggbeater antenna for satellitle comms I was very happy to make this contact, and Mike had alot of history/knowledge of Satellites as well, it was a great QSO and I got back to work on my mast head amp.

Having place the mast-head amp in the ellectrial box housing and marking out where the bolts to attach it to the beam/scaffold would go, i then drilled two small holes with a dremel do it would line up nicely once in the box. I attached velcro supplied with the box to the back of the masthead amp. Its incredbly strong stuff and affixed the amp to the box nicely. I then screwed on the triplexer via a N-Type barrel connector.

With the triplexer and amp connected, i dremelled out the side-holes for where the feed line from the radio will come and the outputs of the triplexer, I stowed the 23cm output and kept a N-Type barellel connector on the 70cm output of the triplexer, as these are all PL259, hopefully this will make attaching the correct antenna to the triplexer easier once outside.

I checked out the feedline holes and am quitely confident the LMR coax I have will fit in there quite nicely. I have M&P Ultraflex10 for the feedlines to the eggbeaters between the multiplexer, to minimize the loss as mch as possible. I’m hopng tomorrows weather is at least dry so I can get outside and get the amp on the mast, then see if I can hear those birds just a little bit better….

A shack tidy (work in progress)

Posted on November 20, 2023 by webmaster@hamradio.knipmeyer.co.uk

With my shack getting some actual usage of late, as well as the G4PRS 2M call on Monday nights, it felt like a good time to tidy things up. I’d not been particualy happy with the layout of the radios in the window, in particular it was susceptiable to any rain/water ingress. With that I orderd a budget 3 tier book shelf, having measured the dimensions, it was a nice foot print and my radios should all fit…

Having move the radios from the shelving, I then set about putting them in-situ to see how it worked out – i wasnt 100% sure where I was going to put the book-case radio shack, but the corner seemed a good idea, and put the Apple iPad that was there back into the Alex Loop pack ready for my next /P or /M use. The position worked well, but there was a clear issue of routing power and coax to the radios, so Ihad to do some ‘DIY’ on the shelves. Here goes my warranty…

The cheapness of the bookcase meant the back-walls of the compatments didnt present much work for the dremel, if it was earlier in the day, I would of done this outside tho, it generate a fair amount of dust and smoke, but I kept the windows wide open and also took my time with each section. I didnt need ‘perfectly square’ holes, just enough so that I can route the coax and other cables thru, and as can be seen in the last photo, this worked out pretty well !

The main transformer now had a nice clearance for its rather noisey fan (my only complain of this transformer, its otherwise done an excellent job) then can start placing the radios in place. I started with my 11m CB+manual antenna matcher, this went in easily enough, and then I placed the Kenwood TH-V71E on top of that. I put all the necessary data/audio cables in place in case I choose to use them, but I’m going to be using this as my main 2m/70cms rig. At the moment its using the Diamond X-9000 which has excellent gain on the 2m and 70cm bands. I am looking forward to trying it out on the G4PRS net on Monday night.

I fed in the very chunky cables for the IC9700. Currently I am running a very simple setup, with no mast head amplifier and direct to the satellite egg-beater antennas. This should become a single feed with a splitter both ends once I put the mast-head amp in place.

With the radios all connected and the basic setup up and running, I then set about using the IC9700 for what it was really designed, operating satellites. Luck would have it that the ISS would be passing over, not a particularly high elevantion at 22 degrees, but worth a try. I waited for an hour and was pleased to hear QSO’s from all over europe going into and out of the ISS repeater. I manually controlled the doppler, but there was no need to rotate the yagis liked what I used to have to do. First impressions of the non-amplified eggbeaters is very encouraging and I look forward to continue to setup the annteas and systems in the coming weeks.

Eggbeater progress and 70cm communications

Posted on November 13, 2023 by webmaster@hamradio.knipmeyer.co.uk

Sundays weather took a turn for a worse, the best part of the day was used to enjoy some time out the shack and with my XYL. We headed off to the New Forest then to Milford on Sea. In the Bongo I have the Kenwood TM-D710GE which I use for APRS on 2M and scan the other bands, GB3IW used to be on 2M, with amazing coverage, being able to reach as far east as Shoreham/Worthing, it was a good way to make /M and /P contacts (as you’ll see in other posts on the blog). I tried out to reach IW from Milford-on-Sea, but no luck, where ever the repeater is now, its a former shadow of its once great coverage, which probably led to its demise thanks to abuse.

We headed back home and whilst there was spatters of rain, there was a time to get out before the sun went down to make some small progress on the satellite antennas.

I removed the previous horizontal beam and replaced it with the one supplied in the kit. I was careful enough, as the vertical holders are only fibreglass, and it would be unwise to knock them and suffer any undue damage! As I had already had a full day, and the next step would be to start erecting the antenna and horizontal fetelling, decided to call it a day, happy at least that the anteannas are in there temmporary mount.

I’m hoping for some good weather today to at least make sure I can locate the coax and get things in place. My son is due to visit this week, so I will put the antenna vertical with him the first time at least, then I will have a better idea of the effort and how easy it is to get up.

I finished the day with a nice meal of roast lamb, which on a cold, wet and rather miserable evening, was a welcome break.

GB3SU + M0DQO 70cm contact

Further to my lack of 70cm contacts via GB3IW, I had a scan thru the bands at the QTH on the IC9700 today (Monday 13/11/23), I was glad to find GB3SU in Southampton. I monitored for a while and was pleased to hear a call out from M0DQO, who was operating portable on his way to work. It was a good QSO and learned about Chris’s setup, which worked really well being /M via Bluetooth controlled PTT Headset. It was a good start to the day and will put the repeater in the D710 to listen to when I’m out and about in the New Forest or en-route to Guildford.

Eggbeater anntennas for Satellite communications

Posted on November 12, 2023 by webmaster@hamradio.knipmeyer.co.uk

Having an IC-9700 offers the benefits of full fuplex communication on the 2m/70cm bands used by satellites. I previously used two yagis and a rotator with some sucsses in contacting satelltites. The IC9700 with HRD performs excellently in doing the ‘doppler’ tracking, but still found that manually rotating the antennas a distraction when attempting to have QSO’s as the ‘birds’ flew over.

With that early this year I ordered the M2 Satellite Package but due to work and study commitments its been sat in my hallway for several months, waiting to be setup. Well today was that day, with fine weather forecast in the shortening winter months, it was now time to take this on, taking a nice break from my academic and technological pursits also got me outside, albeit just to the front garden !

My first tasks was to remove the Yagis from the existing beam (I was later to learn this wasnt strictly necessary), so I took the 70cm and 2m yagis and put them in them in storage. They can probably be well used on the bike stand for /P operation in the future, although I do have the handheld arrrow antenna for that as well.

I unpacked the antennas, which had been done very well by M2 in the US, you’ll see more of that on the video once I edit it all together ! I started on the 70cm antenna as it was smaller and easier to handle, and would give me some experience ready for the larger 2m antenna.

I found that getting the copper into the loop configurations was easy enough, by feeding thru gently into the eyelets and placing into the holders at the base, the small screws were manageable even with my large fingers. I had tightened and then finished with the allen key.

I then started on the base of the radial holder, whilst the antennas can be used without these, for satellitle communicaton they proivde a reflective plan providing gain at the horizon and a null directly overhead, this is exactly what is needed as the time a ‘bird’ is spent overhead is very short, with the tracking previously done via the TV rotator taking the time to get across the sky.

For the 70cm radials one hand holding the radial and another screwing in the bolt was not an issue due to the size of/lightness of the radials. These went in really well thanks to the precision engineering.

Having completed the main 70cm antenna, it was time to attach it to the supplied beam. I always seem to struggle with getting these U-Clamps on, and it was still no exception in this case, still after a bit of fettling, I had the 70cm nicely installed on the beam, ready for the 2M antenna to go on next. I had a break and a nice cup of tea first tho.

Having had a nice cup of tea and a bit of a break, i then went on to the 2m antenna. This is much larger in size than the 70cm antenna and features a extender bolt. All of the components looked good quality and should provide years of good serivce. I had no problem with the copper wire to form the egg beater. Having taken my knowledge from the 70cm construction, i put the small radial trap-bolts in 90% of the way, then locked in the radials one a time, this really made sure that I wouldnt lose the bolts and the radials had a good girp.

After tidying up, I moved the antenna to where I will try it out first and know I have enough feed line to reach it, it should just about get the roof line of the bunglow in this part of the garden.

Forecast for weather tomorrow is not looking to bad, but not quite as nice as today, hopefully there is a few hours to at least get the feed line and the antenna up. I do have a mast head amplifier as well, but I’m taking it one stage at a time !

Hopefully i’ll provide another update soon !

Satellite Antenna build – 70cm antenna

Posted on August 7, 2022 by webmaster@hamradio.knipmeyer.co.uk

So during a break from studies and the fact this 70cm antenna had been sat in the shack since mid July, I decided this morning to at least make some progress with it.

The warm weather continues here in England/IO90BS – neighbouring Hampshire is now on a hosepipe ban, I’m hoping with the plentiful rivers and springs that Bournemouth will not be subjugated to such things, but with another 30c week forecast next week, who knows. I’m having to do any outside work very early in the morning else its just too hot to work.

I enjoyed my attempts at satellite communcation with the Kenwood THD7 and Arrow antenna, this is great for portable operation. In the shack I have the ICOM 9700, which is built for satellite operation, as yet I’ve only used the 9700 on simplex and repeaters per-band, so probably 50% less than what the radio can actually do ! The Satellite feature allows split channel and (2m&70cm), so I wanted a solution to use the 9700 at the QTH.

I didnt want to spend a fortune on antennas, so I hunted out a reasoniibly priced 2m and 70cm antenna. For today will talk about the 70c antenna, the DUAL PA432-8-1.2RA. I got mine from Nevada Radio, other places sell them, but I’ve never had any problems with Nevada radio in terms of getting products to me and after sales care.

The specifications for the antenna are very good for the price, and with satellite communications you don’t want an antenna that is very focused (i.e. with alot of elements on it) else it makes tracking the passes a very precise movement across the sky. As I’m using an old TV rotator at 30 degrees fixed tinflation, this should be a good antenna for me.

Assembly was easy enough, the instructions and labelling of the elements are very good to ensure they are put in the right way first time. I have yet to threadlock my screws until the antenna goes up, but will do when I know it is working correctly and raised. There is a choke on there, its important *not* to unclips/cut these, if you’ve not seen a 70cm antenna before you might be tempte dto cut them thinking its packaged this way, and its not, just leave as is 🙂

Once completed I erected the antenna on the bike stand. Initial results were disappointing with the SWR very out of the 70cm band. Rembembering how volitle and sensitive equipment is at this frequency I swopped out the coax, which resulted in much better results.

I was very happy for about an hours work to get an antenna with high gain and good SWR reports.

As I want to mount the antenna on a horizontal beam, I will need to work out how to attach it (probably another 90 degree holder), but for now I’m glad the antenna is out its box and ready to use.

Next week I’ll hopefully get the 2m Yagi built (Diamond A144S5R2) and then can see how to tie it all together.

2E0FWE Site

HAM Radio activites of Alan K.

Category Archives: 70cm