Thanks for this very well-prepared and presented lecture. I've done some previous learning on this subject and you came up with some interesting points and "real world" tips. Thanks for your time and effort that went into this. 👍
Great presentation. I can vouch for the effectiveness of Colin's QRP transformer design as I've been using one for the last year or so here. It's survived all sorts of grim weather and has made QRP contacts all over the planet in SSB and CW.
The choke being moved to the transformer altering the SWR proves that the antenna system is trying to use the coax to compensate for a lack of an adequate RF ground which makes me question whether the claim that you don't need any radials, or at least something forming a RF ground, is required and whether a 0.05 wavelength counterpoise is enough. If you removed the choke altogether and the SWR altered, even with a 0.05 wavelength counterpoise in place, then it would confirm that the antenna system is using as much of the feeder as it needs to compensate for the lack of an adequate RF ground and the claims made by many that it doesn't are false.
I beleive that an amount of the coax is required as a "counterpoise". If i use no choke used and then a choke 0.05 away from feed point there is zero difference to the SWR between these. If I place the choke right at the feedpoint then the SWR does change dramatically compared to the previous 2 scenarios of no choke or one 0.05 away.
Many thanks to Colin for giving it a go, fair play to him. But judgeing from the comments so far, I think I must be on another planet. There were unfortunately several technical mistakes and some of the slides were too blurry to read and generalally the presentation was a bit disjointed. My critisison is really aimed at the RSGB tonight at 8. If you can't put out a reasonably semi professional video, then please don't.
Great presentation Colin, very informative, thanks for taking the time to put it together, and to the RSGB for getting it out there.
Outstanding! Thanks for posting.
Great presentation. Really informative & enjoyable.
Thanks for this very well-prepared and presented lecture. I've done some previous learning on this subject and you came up with some interesting points and "real world" tips. Thanks for your time and effort that went into this. 👍
We're glad you enjoyed it. Do subscribe to our UA-cam channel if you don't already, as we'll be sharing some Convention lectures in the coming weeks
Excellent presentation!
Great presentation. I can vouch for the effectiveness of Colin's QRP transformer design as I've been using one for the last year or so here. It's survived all sorts of grim weather and has made QRP contacts all over the planet in SSB and CW.
Great to hear you've enjoyed the webinar - and that you've been able to put Colin's recommendations into action 🙂
This is great. Very informative and well presented. Thank you M7MDO
We're glad you enjoyed it. If you subscribe to our UA-cam channel you won't miss out on all the other great content we release!
@@TheRSGB I am already 😊
The choke being moved to the transformer altering the SWR proves that the antenna system is trying to use the coax to compensate for a lack of an adequate RF ground which makes me question whether the claim that you don't need any radials, or at least something forming a RF ground, is required and whether a 0.05 wavelength counterpoise is enough. If you removed the choke altogether and the SWR altered, even with a 0.05 wavelength counterpoise in place, then it would confirm that the antenna system is using as much of the feeder as it needs to compensate for the lack of an adequate RF ground and the claims made by many that it doesn't are false.
I beleive that an amount of the coax is required as a "counterpoise". If i use no choke used and then a choke 0.05 away from feed point there is zero difference to the SWR between these. If I place the choke right at the feedpoint then the SWR does change dramatically compared to the previous 2 scenarios of no choke or one 0.05 away.
Many thanks to Colin for giving it a go, fair play to him.
But judgeing from the comments so far, I think I must be on another planet.
There were unfortunately several technical mistakes and some of the slides were too blurry to read and generalally the presentation was a bit disjointed.
My critisison is really aimed at the RSGB tonight at 8.
If you can't put out a reasonably semi professional video, then please don't.