开云体育

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Re: 20 W Amp Oscillates

K9HZ All Messages By This Member #6235 开云体育 DON’T DO THAT!?? It REMOVES THE BPF FROM THE RX CHANNEL!!! ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ ? Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois ? Owner – Operator Villa Grand Piton – J68HZ Soufriere, St. Lucia W.I. Rent it: ? Moderator: North American QRO Group at Groups.IO. Moderator: Amateur Radio Builders Group at Groups.IO. ? email:? bill@... ? ? toggle quoted message Show quoted text From: [email protected] <[email protected]> On Behalf Of D Solt via groups.io Sent: Friday, March 21, 2025 3:30 PM To: [email protected] Subject: Re: [AmateurRadioBuilders] 20 W Amp Oscillates ? Jerry, Try removing C18 on the LPF-Control or grounding the receive pins on the TR switch.? I think the feedback is getting in through U1 & U8.? Maybe the control logic is not correct. dave ? On Fri, Mar 21, 2025 at 4:25?PM K9HZ via <bill=[email protected]> wrote: No this is a software problem because others are having it too.? Did you recently upgrade? ? Dr.?William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ ? Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois ? Owner – Operator Villa Grand Piton - J68HZ Soufriere, St. Lucia W.I. Rent it: ? email:??bill@... ? On Mar 21, 2025, at 3:10?PM, jerry-KF6VB <jerry@...> wrote: ?No progress on my oscillation problem. I figured maybe it was external feedback from the LPF to the BPF. So I tried moving the BPF farther away from the LPF...no difference. Then I disconnected the BPF entirely & replaced it with an SMA barrel...no difference. I noticed that a few of my SMA connectors were fraying where the cable joined the crimp. Peeled off a bit of insulation and soldered them to the crimp ferrule. No difference. - Jerry, KF6VB

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#6235

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