Put a pair of switching diodes (IE: 1N914) back to back and across the
pre-amp input to ground. High level RF will be shunted to ground while not
effecting normal operation. ARR used to include the diodes if you
specifically asked for them.
Doug
K4AC
> -----Original Message-----
> From: towertalk-bounces@contesting.com [mailto:towertalk-
> bounces@contesting.com] On Behalf Of Jim Brown
> Sent: Saturday, May 23, 2009 11:28 PM
> To: TowerTalk
> Subject: Re: [TowerTalk] ARR 1.8 - 2.0 MHz Pre-Amp
>
> On Sun, 24 May 2009 02:40:36 +0000, RICHARD SOLOMON wrote:
>
> >Anyone know where I can buy one of these ?
>
> I've used their VHF pre-amps on 6M and 2M, and they work fine. BUT
> -- they do NOT like a much RF in their front end -- they fail. I'm
> using a DXE preamp to match the level of my Beverages to the RX
> inputs of my K3 (also FT1000MP, TS850) and it works VERY well. So
> well, in fact, that my Beverages are still useful on 20M!
>
> Note that preamps are almost never needed below about 14 MHz except
> for these low output RX antennas, and even then, only to equalize
> their levels with the main TX antennas.
>
> 73,
>
> Jim K9YC
>
>
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