[Amps] QRO HF2000 tank coil Q question
dj7ww at t-online.de
Mon Mar 22 13:51:44 EDT 2021
I used stacks of T225-2 for a mobile antenna loading coil on 40m.
Measured Q was around 400.
Toroid coils with taps, which no good idea anyway, will have much lower Q.
As part of a pi network for 160m in the 2KW out class only T400 was not
getting too hot, stacks of T300 still overheated in RTTY.
From: Amps [mailto:amps-bounces at contesting.com] On Behalf Of John Keating
Sent: Montag, 22. März 2021 17:23
To: Amps at contesting.com
Subject: [Amps] QRO HF2000 tank coil Q question
Wondering if anyone can provide the specs on the low band tank coil for a
It appears to be a stack of two red-mix T225A-2 iron powder toroids, with a
total of 25 turns, and taps for 40M at the 7th turn, and for 80M at the 13th
Also wondering if anyone else notices how hot it gets on 160m.
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