[LCC] 7QP this weekend!

[w5wz at w5wz.com]

Steve,

that is a great question.  Here's my attempt to answer it.

Currently, I only connect the beverage to a single radio, but am making 
plans to implement a switching scheme like I've seen and experienced at 
K8AZ.

The ideal situation would be to set it up like K8AZ:

First, all the receive antenna feedlines come all the way back into the 
shack.  Then, a Magic-T style splitter is inline on each incoming 
receive ant feedline.  Next, after the splitting, preamps and 
attenuators are inline to "normalize" and balance signal strengths 
before connecting to the receive antenna switches that are found behind 
operating positions C & D.  So at K8AZ, there are 2 positions for low 
bands.  Because of the splitters and two distinct receive antenna 
switches, C & D can listen to the same or to different receive antenna 
without eliminating any available receive antenna from the other radio.

Here is how it works at K8AZ, for both position C & D:

1.  After the splitters, preamps and attenuators, all available receive 
antennas connect to an antenna switch in the shack, right behind the 
operating position.
2.  The transceiver's RX ANT OUT is connected to Port 1 of that antenna 
switch.
3.  The common from the antenna switch passes thru automatic (Dunestar 
100w) bandpass filters to the RX ANT IN on the transceiver.
4.  The transceiver is always set to listen to the RX ANT IN port, no 
matter what.

Then, to listen on your transmit antenna, select position 1 (and gain 
the added benefit of passing the signal thru both the transmit chain 
external band pass filters (Dunestar 200w automatic between XCVR and 
AMP; and after the amp on each band's feedline to the antenna farm are 
high power WA3NQN single-band filters) and the receive chain (the 
external Dunestar 100w btwn the rcv ant switch and the receiver).  Other 
positions on the rcv ant switch will only benefit from the receive chain 
BP filters.

--Scott, W5WZ



On 2017-05-05 06:58, Steve Lott wrote:
> Hi Scott !!!
<snip>
> However I have a Question for you,
> I know you use beverages
> I think you do also do some SO2R, if I am right on the SO2R
> are you using band pass filtering OR Stubs on the Receive antennas ?
> 
> Cheers!
> Steve
>