On 2025-04-13 13:00, K9HZ wrote:
Jerry¡ on the 1.8 MHZ filter¡ did you build it on the LPF or did
you just short across it?
*** I built it.
- Jerry, KF6VB
DR. WILLIAM J. SCHMIDT - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ
PJ2/K9HZ VP2EHZ
Owner - Operator
Big Signal Ranch ¨C K9ZC
Staunton, Illinois
Owner ¨C Operator
Villa Grand Piton ¨C J68HZ
Soufriere, St. Lucia W.I.
Rent it: www.VillaGrandPiton.com [1]
Moderator: North American QRO Group at Groups.IO.
Moderator: Amateur Radio Builders Group at Groups.IO.
email: bill@...
FROM: [email protected] <[email protected]>
ON BEHALF OF jerry-KF6VB
SENT: Sunday, April 13, 2025 1:29 PM
TO: [email protected]
SUBJECT: [AmateurRadioBuilders] U8 test
Hello all,
My T41 has been oscillating on bands higher than 20M. I think others
have traced
a similar problem to U8, the first analog switch in the receive path
on
the K9HZ LPF control card.
I just looked at the card - U8 is going to be a challenging chip to
replace, and it
would be nice to test things first, and not replace it if it doesn't
need it. Can anybody supply details of such a test? I have a decent SA
with tracking generator.
- Jerry, KF6VB
Links:
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[1]
[2] /g/AmateurRadioBuilders/message/6392
[3] /mt/112245177/243852
[4] /g/AmateurRadioBuilders/post
[5] /g/AmateurRadioBuilders/editsub/243852
[6]
/g/AmateurRadioBuilders/leave/11522011/243852/920863695/xyzzy
