Mark III no receive, but does transmit

husker
Old Timer who can't shut up

Posts: 461

Mark III no receive, but does transmit Feb 4, 2019 0:38:47 GMT -5

Quote

Post by husker on Feb 4, 2019 0:38:47 GMT -5

Hi all,
I have been working on my Mark III for over a decade slowly doing work between other projects.
I had the AM working awesome, but no SSB receive at all. I went to adjust the plate tuning, the screw was frozen, when it let go it moved way to much and pegged my swr/power meter. I re adjusted it but now I have no receive at all even in AM. SPOT doesn't work either (it did).
So it seems the relay isnt fully resetting? Also the 8.5k sandbar resistor is getting extremely hot in the transmitter side.

There is a slight hiss (like static) but no receive. On the SSB side, it isn't working either. I can transmit but zero receive at all. No hiss no nothing.
I have replaced all the caps, any burnt resistors etc.

HELP guys..I want my MarkIII to work!!!

Bob

238 Old Timer who can't shut up Posts: 720	Mark III no receive, but does transmit Feb 4, 2019 21:47:38 GMT -5 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by 238 on Feb 4, 2019 21:47:38 GMT -5 Mine did that the other day. It ended up being the V3/ 12at7 tube. Tube was good, but the pins & socket needed cleaning. When i did that the receive came back. 238

husker Old Timer who can't shut up Posts: 461	Mark III no receive, but does transmit Feb 4, 2019 22:45:31 GMT -5 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by husker on Feb 4, 2019 22:45:31 GMT -5 I am thinking part of the relay is stuck. The 8.5 K sandbar gets so dang hot, it would blister your finger. zthat's nt good lol

husker
Old Timer who can't shut up

Posts: 461

Mark III no receive, but does transmit Feb 4, 2019 23:02:10 GMT -5

Quote

Post by husker on Feb 4, 2019 23:02:10 GMT -5

Feb 4, 2019 21:47:38 GMT -5 238 said:

Mine did that the other day. It ended up being the V3/ 12at7 tube. Tube was good, but the pins & socket needed cleaning. When i did that the receive came back. 238

Well, I tried what you said...son of a gun if AM didnt come back! Now on the SSB lol

321 treeclimber Old Timer who can't shut up Posts: 675	Mark III no receive, but does transmit Feb 5, 2019 7:37:27 GMT -5 via mobile Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by 321 treeclimber on Feb 5, 2019 7:37:27 GMT -5 What is the spot switch ? Sorry,its an ignorant question but i have it on a hb111 that i want to get working. 321
	Last Edit: Feb 5, 2019 7:38:30 GMT -5 by 321 treeclimber

238 Old Timer who can't shut up Posts: 720	Mark III no receive, but does transmit Feb 6, 2019 1:47:47 GMT -5 husker and 321 treeclimber like this Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by 238 on Feb 6, 2019 1:47:47 GMT -5 You use it to line the receiver with the transmitter.

321 treeclimber Old Timer who can't shut up Posts: 675	Mark III no receive, but does transmit Feb 6, 2019 6:09:23 GMT -5 via mobile Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by 321 treeclimber on Feb 6, 2019 6:09:23 GMT -5 Thank's

Post by husker on Feb 4, 2019 0:38:47 GMT -5

Post by 238 on Feb 4, 2019 21:47:38 GMT -5

Post by husker on Feb 4, 2019 22:45:31 GMT -5

Post by husker on Feb 4, 2019 23:02:10 GMT -5

Post by 321 treeclimber on Feb 5, 2019 7:37:27 GMT -5

Post by 238 on Feb 6, 2019 1:47:47 GMT -5

Post by 321 treeclimber on Feb 6, 2019 6:09:23 GMT -5