Yaesu FT102 no TX - UK Vintage Radio Repair and Restoration Discussion Forum

Old80git · 30th Sep 2018, 1:33 pm

Hi,
My 102 has no transmit, new PA stage with valves new RF valve all relays seem to be operating, voltages are present OK on plate and screen grids, can anyone help me ?

Reg G4VWF

g4aaw pete · 30th Sep 2018, 7:55 pm

Hello Reg

A few questions:

Does the PA current appear to be 'right'?
Does the lack of output power happen in all modes, even in tune mode?
Is there a satisfactory 'click' from the relays when using the PTT?

I have an FT102, but its some time since I gave it an airing.
The number one cause of trouble with these, as I'm sure you're aware, is relays.

Mine came to me with a duff antenna change-over relay. At the time, these were available from the dearly departed Maplin.

Regards
Pete

HamishBoxer · 30th Sep 2018, 8:59 pm

Knowing what the relays are like,might be worth a dowsing in De-Oxit.

Welcome to the forum!

Old80git · 23rd Oct 2018, 11:13 am

Can anyone help me with the connections for the RF relay that resides alongside the 6146 valves in the PA compartment? I need a few good photos to show how it is connected, if anyone can help me I would be eternally grateful, please ground the anodes before getting near as high voltages can lurk in here, but it only takes a couple of minutes to remove top cover and lid on the PA compartment, I really need help and am politely asking for it.

Another "old git" G4VWF. 80 years old.

g4aaw pete · 23rd Oct 2018, 11:00 pm

This is the drawing I made when replacing the antenna relay on mine.
Sorry, but didn't take any pictures.

Radio Wrangler · 23rd Oct 2018, 11:37 pm

Someone, somewhere may have several dozen of those relays sold off in a bag at the end of Maplin.

David

Restoration73 · 24th Oct 2018, 7:19 am

The three band switch spindles are linked by couplers. These sometimes work loose
meaning the switch contacts don't line up on the correct band so check these.

30th Sep 2018, 1:33 pm	#1
Old80git Retired Dormant Member Join Date: Sep 2018 Location: Northampton, Northamptonshire, UK. Posts: 2	Yaesu FT102 no TX Hi, My 102 has no transmit, new PA stage with valves new RF valve all relays seem to be operating, voltages are present OK on plate and screen grids, can anyone help me ? Reg G4VWF

30th Sep 2018, 7:55 pm	#2
g4aaw pete Heptode Join Date: Jan 2008 Location: Birchington Kent, UK. Posts: 596	Re: yaesu FT102 no TX Hello Reg A few questions: Does the PA current appear to be 'right'? Does the lack of output power happen in all modes, even in tune mode? Is there a satisfactory 'click' from the relays when using the PTT? I have an FT102, but its some time since I gave it an airing. The number one cause of trouble with these, as I'm sure you're aware, is relays. Mine came to me with a duff antenna change-over relay. At the time, these were available from the dearly departed Maplin. Regards Pete

30th Sep 2018, 8:59 pm	#3
HamishBoxer Dekatron Join Date: Aug 2007 Location: W.Butterwick, near Doncaster UK. Posts: 8,935	Re: yaesu FT102 no TX Knowing what the relays are like,might be worth a dowsing in De-Oxit. Welcome to the forum! __________________ G8JET BVWS Archivist and Member V.M.A.R.S

23rd Oct 2018, 11:13 am	#4
Old80git Retired Dormant Member Join Date: Sep 2018 Location: Northampton, Northamptonshire, UK. Posts: 2	Yaesu FT102 RF relay Can anyone help me with the connections for the RF relay that resides alongside the 6146 valves in the PA compartment? I need a few good photos to show how it is connected, if anyone can help me I would be eternally grateful, please ground the anodes before getting near as high voltages can lurk in here, but it only takes a couple of minutes to remove top cover and lid on the PA compartment, I really need help and am politely asking for it. Another "old git" G4VWF. 80 years old.

23rd Oct 2018, 11:37 pm	#6
Radio Wrangler Moderator Join Date: Mar 2012 Location: Fife, Scotland, UK. Posts: 22,896	Re: Yaesu FT102 no TX Someone, somewhere may have several dozen of those relays sold off in a bag at the end of Maplin. David __________________ Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done

24th Oct 2018, 7:19 am	#7
Restoration73 Nonode Join Date: Jun 2013 Location: Surbiton, SW London, UK. Posts: 2,801	Re: Yaesu FT102 no TX The three band switch spindles are linked by couplers. These sometimes work loose meaning the switch contacts don't line up on the correct band so check these.