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Topband: OK1RP (KD9SV) Front end saver experiences - how much isolation

To: "topband@contesting com" <topband@contesting.com>
Subject: Topband: OK1RP (KD9SV) Front end saver experiences - how much isolation should I expect?
From: g3nkc via Topband <topband@contesting.com>
Reply-to: g3nkc <g3nkc@yahoo.co.uk>
Date: Fri, 31 Oct 2025 07:52:06 +0000
List-post: <mailto:topband@contesting.com>
Good morning all,Just before I departed to TO4K,  we had the possibility of an 
rx antenna, at the last minute.Some while ago, I obtained a pcb based on the 
OK1RP pcb artwork, which I threw together the day before my departure.I had 
proven the operation of the assembled pcb before I travelled, but the unit was 
not boxed, and I had to use flying leads off the pcb for final testing in 
situ.I found that the isolation obtained was about 4 s-units, which probably 
isn't good enough.  Actually our rx antenna anyway was not good enough ( too 
noisy), different story! I tested this by activating the ptt direct to the 
unit, and observing the signal reduction.I plan to mount the pcb in a die cast 
box, and coax to the pcb.The question, if anyone is using this design,  how 
much isolation do they see when on tx ?( currently used with my K3)73 Dave, 
G3NKC  (MD4K & TO4K op.)Sent from my Galaxy
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