In the case of the YCCC 9-circle array, which I designed, common mode
suppression is deployed at both the antenna ends of the feedlines and at the
combiner where the antenna feedlines come together. The YCCC feedpoint preamp
already includes common mode suppression, so additional feedline
I do have very high CMI chokes (0ver 10K ohms) at the feedpoint of each
vertical element and at the HI-Z combiner box for each element. This may
seem extreme, but I am more than pleased with the results. I have been
working on improving the low band RX systems here for many years. I have a
113 ft
On 11/30/2021 11:34 AM, Lee STRAHAN wrote:
All my Hi-Z amps have had common mode isolation in them since day one. So
placing another choke at the Hi-Z amps seems to be not necessary.
Makes sense to me! Thanks Lee.
73, Jim K9YC
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Greetings All,
For the Hi-Z arrays any additional common mode choking for most all
installations would not be needed. You are correct at K3LR there are added
common mode chokes in the element feedlines. I am fairly certain that adding
these helped more with interstation isolation. I have
The feedline (if coax) outer braid responsible for imbalance RF
radiation, is fed from the antenna end.
Choking it there eliminates a RF active length.
vk4tux
On 1/12/21 03:48, Dennis W0JX via Topband wrote:
K9YC made an interesting comment in his post, saying that the feedline chokes
Nope it’s just the high EU QRM level you are fighting!
Regards,
Mark, K1RX
> On Nov 30, 2021, at 11:15 AM, David Olean wrote:
>
> Hello Nick,
>
> You were my contact #2 on 160. Vy FB signals! I had much trouble being heard
> in EU both nights. I called many weak and strong stations and
K9YC made an interesting comment in his post, saying that the feedline chokes
would be most effective if placed at the antenna end of the feedline.
W1FV's 9 circle YCCC array has them right at the controller.
The older K7TJR combiner utilized no feedline chokes. However, I believe that
Lee's new
thanks Dave
The conditions were difficult. I did not hear many stations from the USA
and Canada, or I heard them very quietly.
Let's hope to see you in ARRL 160
---
Nick, UY0ZG
http://www.topband.in.ua
David Olean писал 2021-11-30 18:14:
Hello Nick,
You were my contact #2 on 160. Vy FB
Hello Nick,
You were my contact #2 on 160. Vy FB signals! I had much trouble being
heard in EU both nights. I called many weak and strong stations and got
no replies. After awhile I quit. It was like my TX antenna fell down!
73
Dave K1WHS
On 11/30/2021 11:05 AM, uy0zg wrote:
Hi
It
Hi
It was raining and foggy all weekend in southern Ukraine. There was a
lot of noise. I suggest listening to some sound recordings:
http://www.topband.in.ua/2021/11/30/sound-recordings-qsos-in-cq-ww-cw-2021-band-160-m/
--
Nick, UY0ZG
http://www.topband.in.ua
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