Re: Topband: Post contest season: TX antenna vs RX antenna cros-stalk. What do you do?

2016-03-27 Thread Jim Brown
On Sat,3/26/2016 3:49 AM, Mark van Wijk, PA5MW wrote: Our fixed setups usually had harmonic coax stub filters per individual antenna. You may find my applications note on optimizing the location of harmonic stubs useful. It's on my website. k9yc.com/publish.htm Using the technique I've

Re: Topband: Post contest season: TX antenna vs RX antenna cros-stalk. What do you do?

2016-03-26 Thread Mark van Wijk, PA5MW
, PA5MW -Original Message- From: Jim Brown Sent: Thursday, March 24, 2016 6:11 PM To: topband@contesting.com Subject: Re: Topband: Post contest season: TX antenna vs RX antenna cros-stalk. What do you do? On Wed,3/23/2016 11:38 PM, Mark van Wijk, PA5MW wrote: The problem is that while

Re: Topband: Post contest season: TX antenna vs RX antenna cros-stalk. What do you do?

2016-03-24 Thread Jim Brown
On Wed,3/23/2016 11:38 PM, Mark van Wijk, PA5MW wrote: The problem is that while listening to your receiving antennas, there is also some signal from the transmit antenna getting through thanks to the internal cross-talk of your rig's TX/RX relay. There are many heads to this snake, but also

Re: Topband: Post contest season: TX antenna vs RX antenna cros-stalk. What do you do?

2016-03-24 Thread JC
>>I was wondering what people do besides the obvious 'kill the TX antenna input during RX mode' ?<< There are several reasons why it is necessary to detune the TX antenna during RX, however disconnecting the center of the TX coax during RX on 160m is a MUST. If you don't understand the problem

Re: Topband: Post contest season: TX antenna vs RX antenna cros-stalk. What do you do?

2016-03-24 Thread Filipe Lopes
I am using 2xTS590 and never had any issues either. 73s Filipe CT1ILT CR6K Sent from my Huawei Mate 8 Em 24/03/2016 12:05 p.m., "Terry Posey" escreveu: > Hi Mark - > > I have not experienced K3 TX/RX antenna isolation problems with my station > configuration. I expect

Re: Topband: Post contest season: TX antenna vs RX antenna cros-stalk. What do you do?

2016-03-24 Thread Terry Posey
Hi Mark - I have not experienced K3 TX/RX antenna isolation problems with my station configuration. I expect that if there is an isolation problem with your rig's TX and external RX antenna routing/switching, that problem would be nearly impossible to quantify using your station's TX and RX

Re: Topband: Post contest season: TX antenna vs RX antenna cros-stalk. What do you do?

2016-03-24 Thread Mark van Wijk, PA5MW
was wondering what people do besides the obvious 'kill the TX antenna input during RX mode' ? 73 Mark, PA5MW -Original Message- From: william radice Sent: Tuesday, March 22, 2016 2:05 PM To: topband@contesting.com Subject: Re: Topband: Post contest season: TX antenna vs RX antenna

Re: Topband: Post contest season: TX antenna vs RX antenna cros-stalk. What do you do?

2016-03-22 Thread william radice
Serious multi-op contest stations face this issue all the time. Most use individual band filters and they almost completely eliminate the issue. At our station we used the Dunestar filters for operating positions on different bands. As for 160 I personally use the KD9SV "front end saver"

Topband: Post contest season: TX antenna vs RX antenna cros-stalk. What do you do?

2016-03-22 Thread Mark van Wijk
Now that we are 'sort of in post contest season mode' and sharing some good ideas, there is another question: During recent Field-day setups I noticed severe cross-talk issues between TX antennas and the separate RX antenna circuits. For sure any TX/R relay circuitry offers roughly 50-65 dB