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 <[email protected]> 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:[email protected]] On Behalf Of Rune > Øye > Sent: 13 November 2018 09:58 > To: [email protected] > 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 > _________________ > Searchable Archives: http://www.contesting.com/_topband - Topband > Reflector > > _________________ > Searchable Archives: http://www.contesting.com/_topband - Topband > Reflector > _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
