The HI-Z preamps do seem to be immune to any normal high power TX issues. I have had a HI-Z 4-sq up with the closest element only 65 feet away from the TX vertical with no problems running full legal limit. Currently I have a 2 element system in place only 30 feet away from my 40 meter 4-sq, also running full legal limit, and have seen no problems.
Back to back diodes are a very bad thing, they will cause all kinds of problems on RX. 73, Larry - W7IUV >________________________________ > From: Ignacy Misztal <[email protected]> >To: [email protected] >Sent: Wednesday, January 4, 2012 5:47 PM >Subject: Topband: 4 sq receive and high power > >I was planning to buy a 4 sq receive system for the upcoming CQ160 contest. >One question is about handling of high power when the 4sq cannot be put far >away from the tx antenna. HI-Z claims that their system is immune to high >power. DX Engineering claims the opposite and requires a sequencer. The >sequencer adds complexity and cost. > >Did anyone experience a damaged amp in those systems? Would clamping the >input of a vertical with 2 back to back diodes be acceptable? > >On a different note, the Hi-Z site states new legal problems and no sales. >There 4 sq was about $770 with new amps. However, DX Enginnering has an >"electrical only" option to HI-Z for $799 that appears equivalent to Hi-Z. >However it is sold out. So neither is available. Not sure there is another >viable option. > >Ignacy, NO9E >_______________________________________________ >UR RST IS ... ... ..9 QSB QSB - hw? BK > > > _______________________________________________ UR RST IS ... ... ..9 QSB QSB - hw? BK
