Topband: Preamp on RX antenna`s in contest environment.

[Filipe Lopes]

Hi

We have developed a preamp for contest purposes and it was tested during CQ
WW SSB @ CR6K in M/S environment.

It is a 15dB preamp, with High pass filter @1.7MHz and the preamp is
controlled by a bias-t. It has also an HF limiter in/out and a polyfuse
protection.

here are a couple of pics:
https://twitter.com/dxfmfr/status/1061323755752960000

if interested let me know off list.

73's Filipe Lopes
CT1ILT - CR6K - CR5E
F4VPX - TM3M


David Cutter via Topband <topband at contesting.com> escreveu no dia terça,
13/11/2018 à(s) 11:41:

> Cross Country Wireless pre-amp have exceptionally high IP3 using FEMPT
> transistors.  He is also developing units for contesters.  Contact owner
> Chris Moulding.
>
> David G3UNA /G6CP
>
> -----Original Message-----
> From: Topband [mailto:topband-bounces at contesting.com] On Behalf Of Rune
> Øye
> Sent: 13 November 2018 09:58
> To: topband at contesting.com
> Subject: Topband: Preamp on RX antenna`s in contest environment.
>
> All,
>
> I am currently building two RX loops for 160 meter band and to be used at
> LA8W contest station. Output signals from these loops is not that great and
> I need to add a preamp. From RX antennas to shack is approx. 1500 to 2000
> feet. I would like to have the preamps at the loops and use DC inject on
> coax cable but wonder if these 15dB preamps will be saturated. I guess the
> will have an “easier life” in the shack and behind some band pas filters.
> Distance from TX antennas is not more than 700 feet on 160. I am building
> the VE3DO loops and will space them 5/8 wave broadside and then feed each
> loop to a DX-Engennering phase box. Any suggestions from the experts J
>
> 73 Rune LA7THA
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