[Skimmertalk] Fw: Re: Antennas for multi-band Skimmer installations

[H Lawrence Serra]

>(Does it make any sense to have 4 times as much money
>in the protection hardware as the SoftRock receiver???)... sigh...
 
Yes! I just had a T/R box with hang timer built to protect my SDR-IQ sdr which feeds the CW Skimmer. My ANTs are close together on the big flat roof here, I usually run 550W. I already fried the front end of my RA6790 milspec rcvr when I used it for the Skimmer because its T/R relay could not keep up with contest fast QSK keying. 
 
I also put in line between the ANT and the SDR-IQ two pairs of cross-polarized 1N914 diodes from the center conductor to the shield, and a #49 panel lamp bulb in a socket in series with the ANT coax center conductor. Much easier to replace the #49 bulb than an RF amp front end. 
 
The hang-timer keeps the ANT disconnected from the Skimmer sdr from the first key-down dit for an adjustable period of hang time suitable for your keying speed.
 
Pete says he cannot send the schematic on Skimmertalk for some reason, so if anyone is interested, send me an email and I will forward it you directly.
 
73, Larry N6NC 



--- On Wed, 9/23/09, Wes Cosand <wes.cosand at gmail.com> wrote:


From: Wes Cosand <wes.cosand at gmail.com>
Subject: Re: [Skimmertalk] Antennas for multi-band Skimmer installations
To: skimmertalk at contesting.com
Date: Wednesday, September 23, 2009, 1:35 PM


On Wed, Sep 23, 2009 at 4:21 PM, Pete Smith <n4zr at contesting.com> wrote:

>  FWIW, the Clifton active antenna amp has a relay between it and the
> antenna rod, which opens whenever it is powered off.  There is also a gas
> tube before the first transistors.
>

Sounds pretty good!  Probably would work fine for my needs.

I am protecting my present receiver with the Polyphaser gas tube and the ICE
model 197 RF Limiter.  (Does it make any sense to have 4 times as much money
in the protection hardware as the SoftRock receiver???)... sigh...

Wes WZ7I
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