UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - FRG-7. Very quiet

Phantomrose1999 · 31st Aug 2020, 2:16 pm

As this is my favourite site, hope there are some FRG-7 experts here

Bringing one back to life but time to reach out

It has low RF sensitivity, can’t peak the front end could, the S meter doesn’t move. On AM it’s very very quiet. On LSB I can hear some noise. Was able to pickup an AM station one day with a very long wire.

Have replaced the 3x 3SK40 fets with originals. All voltages ok. The two oscillators are working. But there is virtually no signal at TP104. At under 1mhz I get a 180mv signal at 52mhz (I do hear noise at the speaker) but at any other frequency there is no output at TP104

Does the mixer IC fail ? SN76514 ?

Any other suggestions ?

David

31st Aug 2020, 2:16 pm	#1
Phantomrose1999 Hexode Join Date: Mar 2008 Location: Melbourne, Victoria, Australia Posts: 289	FRG-7. Very quiet As this is my favourite site, hope there are some FRG-7 experts here Bringing one back to life but time to reach out It has low RF sensitivity, can’t peak the front end could, the S meter doesn’t move. On AM it’s very very quiet. On LSB I can hear some noise. Was able to pickup an AM station one day with a very long wire. Have replaced the 3x 3SK40 fets with originals. All voltages ok. The two oscillators are working. But there is virtually no signal at TP104. At under 1mhz I get a 180mv signal at 52mhz (I do hear noise at the speaker) but at any other frequency there is no output at TP104 Does the mixer IC fail ? SN76514 ? Any other suggestions ? David Attached Thumbnails Last edited by Phantomrose1999; 31st Aug 2020 at 2:29 pm.