Topband: 4 sq receive and high power

[Hardy Landskov]

Ignacy,
I have a K7TJR 4 square. In fact I was one of the beta testers way back and 
I have measured +15 dBm using an HP 435A power meter on the 4 square when 
transmitting 1500 watts on my Delta Loop which is 160 feet away. The receive 
patterns are very distorted according to EZNEC when I put all the towers and 
antennas in the file BUT it still works great and I have not had any rx amp 
failures. I was surprised but the Hi-Z amps are very bullet proof.
73 & HNY Hardy N7RT


----- Original Message ----- 
From: "Ignacy Misztal" <no9e at arrl.net>
To: <topband at contesting.com>
Sent: Wednesday, January 04, 2012 6:47 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
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