Ubitx audio feedback problem. - UK Vintage Radio Repair and Restoration Discussion Forum

Radio Scotland · 2nd Sep 2021, 2:08 pm

Recently built an ubitx transceiver version four. The problem with this version is low RX audio. So i added an audio amp and now i have plenty of volume. Problem is i'm getting audio feedback on TX. I read online about a guy who cured it by putting a 5 volt relay on the PTT line which cuts the speaker off during TX. I've tried this but the relay won't active on TX.

Anyone got any ideas on why this is ?

Thanks in advance for any help.

Cheers.

Radio Scotland · 2nd Sep 2021, 10:31 pm

Well after doing a bit of research it seems i need to use a ''low level relay'' But not sure how to wire it

2nd Sep 2021, 2:08 pm	#1
Radio Scotland Heptode Join Date: Jul 2020 Location: Larkhall, South Lanarkshire, Scotland. Posts: 671	Ubitx audio feedback problem. Recently built an ubitx transceiver version four. The problem with this version is low RX audio. So i added an audio amp and now i have plenty of volume. Problem is i'm getting audio feedback on TX. I read online about a guy who cured it by putting a 5 volt relay on the PTT line which cuts the speaker off during TX. I've tried this but the relay won't active on TX. Anyone got any ideas on why this is ? Thanks in advance for any help. Cheers. __________________ Help!! I've been electrocuted by a glass thing that glows

2nd Sep 2021, 10:31 pm	#2
Radio Scotland Heptode Join Date: Jul 2020 Location: Larkhall, South Lanarkshire, Scotland. Posts: 671	Re: Ubitx audio feedback problem. Well after doing a bit of research it seems i need to use a ''low level relay'' But not sure how to wire it __________________ Help!! I've been electrocuted by a glass thing that glows