[Skimmertalk] Skimmertalk Digest, Vol 58, Issue 9

[Rafael A. Peña]

My RX antenna is the 40M element on my Force 12 system.  I also have an active antenna (whip) which is in my small DC backyard home but lately prefer the 40M element.   I protect my QS1R with a Front-end-Saver device.   I can TX and have found no issues at all.

PS:  My skimmer will be turned off from duty from July 1-20.... Family is heading to YN for a much needed vacation.

Cheers!

Rafael A Peña
NN3RP
Washinington, DC
> 
> Message: 3
> Date: Sun, 23 Jun 2013 21:11:48 -0400
> From: Pete Smith N4ZR <n4zr at contesting.com>
> To: skimmertalk at contesting.com
> Subject: Re: [Skimmertalk] disabling USB connection
> Message-ID: <51C79CD4.7090402 at contesting.com>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
> 
> Yep, been there, and been doing that for years, Bob - in my setup, PTT 
> removes voltage from the active antenna, which opens a relay to the 
> whip, and also removes DC from my preamp.  That protects the hardware 
> just fine, and in my case, where the transmitting antennas are ~500 ft 
> from the RX antenna, and ~200 feet from the RX itself, is quite 
> adequate. I asked the question more for the guy whoseSkimmer antenna and 
> TX antennas are within 50 feet of each other.
> 
> In fact, the RBN Aggregator already does this in software with a "bad 
> call list".
> 
> 73, Pete N4ZR
> Check out the Reverse Beacon Network at
> http://reversebeacon.net,
> blog at reversebeacon.blogspot.com.
> For spots, please go to your favorite
> ARC V6 or VE7CC DX cluster node.
> 
> On 6/23/2013 7:00 PM, Bob Wilson, N6TV wrote:
> > On Sun, Jun 23, 2013 at 9:14 AM, Pete Smith N4ZR <n4zr at contesting.com>wrote:
> >
> >> It occurs to me that one way to mute a QS1R, SDR-IQ or similar receiver
> >> might be to open one or the other (or both) data lines in the USB cable.
> >>   This probably is 'way too simple - does any of you know if the USB drivers
> >> used on motherboards would tolerate this without throwing an error?
> >>
> > It sounds like you want to mute the data to prevent "images" of your
> > transmitted signal from being spotted? It's probably much simpler to do
> > that in software (e.g. use a "reject" list to eliminate every variation of
> > your own callsign being spotted by the local skimmer).
> >
> > The real need, of course, is to open or protect the front end of your SDR
> > whenever you transmit.  Opening or stopping the USB line will not protect
> > your SDR. :-)
> >
> > Some RX antennas using remote Pre-Amps (e.g. active Rx Loops or short
> > vertical whips) provide a way to quickly remove pre-amp power using the PTT
> > line on the radio.  That's very effective, and much better than trying to
> > do it in software or via USB commands or tricks.
> >
> > 73,
> > Bob, N6TV
> > _______________________________________________
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> > Skimmertalk at contesting.com
> > http://dayton.contesting.com/mailman/listinfo/skimmertalk
> >
> 
> 
> 
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> Subject: Digest Footer
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> End of Skimmertalk Digest, Vol 58, Issue 9
> ******************************************