28 Feb 2021

Stroke update - NOT amateur radio

My 2013 stroke left me outwardly looking fine, but it has had a lasting impact on me. Before I was quite active and healthy, but these days things are far harder. 

In many ways I am more fortunate than many. My voice is poor and driving, and being driven, is far harder. A few years ago I could drive 300 miles to Devon. Even 10 miles is hard these days.

See https://sites.google.com/site/g3xbmqrp3/stroke .

CDARC 80m net

As an experiment I tried to join the CDARC (Cambridge club) 80m net this morning with my 2.5W and the earth-electrode antenna. Although I had no problem hearing people, I could not be heard. My noise level is very low on this antenna, but I needed more power to overcome noise others were probably suffering. 

The SWR is too high for the auto-ATU on my FT991A. It just says "High VSWR" and gives up. On the FT817ND it works fine.

Hare Park Chippenham - NOT amateur radio


The photo shows Hare Park, Chippenham near Cambridge a few years ago. This is open to the public a few times each year. The snowdrops were incredible. 

Reeds - NOT amateur radio

This part of the UK  (East Anglia) is thought of as flat and boring yet it has a unique beauty. 

Often the skies are amazing and the land watery. My wife took this photo a few days ago. 

Ultra simple transceiver for 10m FT8

One of my ideas is for an ultra simple crystal controlled FT8 transceiver for 10m probably. Another option is 15m. Crystals can be quite expensive, but bought in quantity the price comes way down. 

I have in mind a simple DSB rig at 28.074MHz only, a bit like my WISPY transceiver.  The full transceiver version of WISPY was never built, but both the RX and TX versions were built. I wonder if there is a low cost source of 14.040 (easily pulled) or 14.037MHz crystals? This would be simpler than a synthesised source. I don't think pulled ceramic resonators would be stable enough, but they might be.

My health rather precludes me designing and building one these days, but I would be more than happy to share my ideas with anyone who could take this on seriously. Ideally, a PCB could be made as a simple kit. 

In my mind this could be a really simple rig that would be able to work the world very soon once 10m really gets going. Don't forget that 10m is always good in the Es season at any part of the solar cycle. Even very low power FT8 would get all across the world.  10m is an excellent band with small antennas and QRP. I can imagine such rigs being incredibly simple and low cost. In this version I used a 2N3866 PA, but I would use paralleled 2N3904s as these are far less expensive.  For greater TX power, further 2N3904s PAs could be paralleled with low value emitter resistors.  This is a very low cost way of getting useful output.

Very few controls are necessary, probably none! It would need a BNC connector and probably something to show it is on RX or TX. I can imagine it fitting in a low cost, small, plastic box.

QRPguys are offering something similar on lower frequencies. Maybe they will offer higher frequencies later as the sunspot cycle gathers pace? 

See https://qrpguys.com/ .

UPDATE 2020z:  Steve G1KQH has told me of some low cost crystals that would certainly work: https://kc9on.com/product/14mhz-hc49u-tall-crystals/

Sunspots - Sunday February 28th 2021

 Solar flux is 79 and the SSN 14. A=4 and K=2.

27 Feb 2021

Silver birch - NOT amateur radio

This photo shows a silver birch tree seen on our walk yesterday in our village here in East Anglia, UK.

As you can tell, the last few days have felt mild and spring like.

According to the UK Met Office, Monday is the first day of spring.

2m FT8 RX today

On 2m FT8 today, I have been RX only with the FT817ND and the big-wheel omni antenna. 

156 stations in 9 countries spotted by teatime. 

UPDATE 2250z: QRT.

Cambridge Radio Club Zoom talk

Last evening, CDARC had another excellent Zoom talk. 

Being on Zoom, speakers can be anywhere and this time the speaker was in Canada! 

I like Zoom talks as these can be seen all over the world. As well as the speaker, there was someone else in Canada taking part I believe.

Zoom has surprised me. By sharing the screen, slides can be seen as easily as in a room. Also, all taking part can chat, by video or just mic if they prefer to wear their bedclothes!

Almost spring - NOT amateur radio


We went for a walk around the village earlier. It felt very mild and springlike. Daffodils are coming out widely now as shown in the photo. 

As we are only in February there is every chance for some bad weather and snow still.