Re: Electrolytics - FT-101B
The wire wound resistors were OK. I cleaned the flying lead contacts and pins on tubes and tested the drive tube, which was OK. No tester was available for the PA tubes. Re-installed tubes and everything worked.
Completed the Rx and Tx alignment process and started 'on air' testing. Power out is low, (20 to 80 watts)? and Rx and TX frequencies do not match. (People have said 'You are off-frequency' every time I've made contacts on this radio.)? I have seen videos on fixing the latter issue and will try to locate matching tunes to get power level up.?
This thing is slowly rejoining the land of the living, but I have to say that using it makes me appreciate my TS590sg!
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Re: Electrolytics - FT-101B
I ran into similar discrepancies when I resurrected my 101E after nearly 30 years in storage. The comments I got back from reputable service people was that tables were "generally accurate" but not to be considered to be dead on. As long as they were steady and nothing seemed to be "suffering" they were OK.
Check to see if the wire wound .6ohm resistor, located on the bottom of the power tube sockets, has been blown open from excessive current.?
if yes, you might have bad power tubes too.?
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Re: Electrolytics - FT-101B
Check to see if the wire wound .6ohm resistor, located on the bottom of the power tube sockets, has been blown open from excessive current.?
if yes, you might have bad power tubes too.?
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Theses relays are not hard to find on eBay.?
Not sure I’d bother with tearing into rewiring that socket!!
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Looking for a replacement for RL1. I think the one in my FT101B has the "tired spring" mentioned in the service manual.? Potter & Brumfield part R10-E1X6-V90 looks like it might work with a bit of wiring change.? Interested to hear if anyone has tried this and what the result was.
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Re: Electrolytics - FT-101B
Cleaned contacts in both relays with card stock and deoxit. Both were visibly dirty. Fired radio up and receive is OK, but I could not get any idle current in Tune mode. I checked rectifier board supply lines and saw:
+748v (vs +600v theory)
-180.7v vs -100v theory
+182.3v vs +150 v
11.5v AC is 10.5v AC
+14.2v vs +13.5v
Yikes!
No sign of damage anywhere. Re-seated relays, but no change. Checking tube now.? The PA tubes are different brands, so I'm guessing all 3 will be replaced before aligning the thing. But right now the big thing seems to be weirdness with power.
I feel snake-bit. Suggestions, anyone?
73,
Tom AI4TH [was KO4HNB]
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Re: FT-101EE: Good RX-No TX
Vince
A source of Tx problems is often Q3 (2sc784R) at PB 1181B RF unit.
good luck Emerson, PP6EW
Em sex., 31 de mai. de 2024 às 10:36, Vince, KN6KKZ via <vf6fhellcat= [email protected]> escreveu:
? I have been away from this project a while and I am eager to get back to work on diagnosing and repairing the TX issue. This FT-101EE receives beautifully, and the S-meter seems to work properly in indicating received signal strength. When PTT or MOX is keyed, the S-meter needle (PO position) jumps to the left, against the resting pin. The movement is only a fraction of a mm, but just enough to observe it being forced the wrong way. The instant PTT/MOX is released, the needle momentarily spikes up to around S5 before coming back to rest on the pin. This same condition occurs on all bands against a dummy load. The needle spike that occurs after releasing PTT/MOX is to around S5 in USB, but when in LSB or AM mode it only spikes up to around S1 (max carrier).?
Just hoping this symptom might throw up a flag for someone and help me narrow down the source of the issue.
Thank you,
Vince, KN6KKZ
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Tom, I value and appreciate moral support. Helps keep up the fighting spirit. I am hoping that I can get the original NEC tubes tested tomorrow to rule them out. I have new C13, C131 and C11 mica caps in hand that I know I should change, but I’ve been a bit intimidated by getting to C13. Looks like the face has to come off to remove the chassis side bar to get in there. I don’t believe this echo-echo has been touched by a #2 Phillips or a soldering iron since it left Japan. Still has the protective film over the panel.
73, Vince, KN6KKZ
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Wish I could offer more than moral support, but I' m fighting the same issue with a 101B.? Every time I correct one thing it uncovers something else.? Bad rectifier board, dirty relays, mismatched PA tubes.? Looks like this could be a long running project!
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? I have been away from this project a while and I am eager to get back to work on diagnosing and repairing the TX issue. This FT-101EE receives beautifully, and the S-meter seems to work properly in indicating received signal strength. When PTT or MOX is keyed, the S-meter needle (PO position) jumps to the left, against the resting pin. The movement is only a fraction of a mm, but just enough to observe it being forced the wrong way. The instant PTT/MOX is released, the needle momentarily spikes up to around S5 before coming back to rest on the pin. This same condition occurs on all bands against a dummy load. The needle spike that occurs after releasing PTT/MOX is to around S5 in USB, but when in LSB or AM mode it only spikes up to around S1 (max carrier).?
Just hoping this symptom might throw up a flag for someone and help me narrow down the source of the issue.
Thank you,
Vince, KN6KKZ
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Re: FT-101 only transmits on 40m
Will look into it but is there a separate alignment for each band??
I can receive ok to some degrees in these bands where I have no output power.
Will browse through the service manual soon.
VA3GPJ
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Re: FT-101 only transmits on 40m
Looks like they are all there. Didn't pull it out to examine.
I am receiving ok on other bands actually. I noticed they are a bit quieter than on 40m but I can receive enough.
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Re: FT-101 only transmits on 40m
Try going through the Rx & Tx alignment procedure.
It might be that the trimmer capacitors need to be touched up correctly to provide drive to the finals.
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Hi,
I got this FT-101 about 2 years ago. I went through some checks to make sure tubes were neutralized and no obvious burned parts. Still has original tubes
It seems to transmit and receive quite fine on 40m. I only had 40m dipole so didn't bother to transmit on other bands.
This year, I got an old tuner, so put up a simple long-wire antenna.?
Again, 40m seems to be fine, I was able to get QSOs on CW and SSB.
But I realized there is no output power on other bands. IC goes up and down as per the "carrier" knob. But on PO meter setting nothing comes out. Nor can I see it on my power/SWR meter. (again 40m it seems to work as it should).
I am a bit stumped. What would you suggest I look at first?
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Re: FT-101 only transmits on 40m
Take a look at the Heterodyne crystal board visible on the top chassis near the right front of the radio. Are all the crystals there?
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FT-101 only transmits on 40m
Hi,
I got this FT-101 about 2 years ago. I went through some checks to make sure tubes were neutralized and no obvious burned parts. Still has original tubes
It seems to transmit and receive quite fine on 40m. I only had 40m dipole so didn't bother to transmit on other bands.
This year, I got an old tuner, so put up a simple long-wire antenna.?
Again, 40m seems to be fine, I was able to get QSOs on CW and SSB.
But I realized there is no output power on other bands. IC goes up and down as per the "carrier" knob. But on PO meter setting nothing comes out. Nor can I see it on my power/SWR meter. (again 40m it seems to work as it should).
I am a bit stumped. What would you suggest I look at first?
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Re: Electrolytics - FT-101B
Thanks, Claude.? Another item for the list...
TH
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Re: Electrolytics - FT-101B
Ello Tom,
I had the same problem and I found that it was the Speech processor.
Check it out, if its not your relay.
Good luck.
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Dang it.? Me again.
Got my 101B working.? Made QSO's in New Hampshire and Mississippi from VA. Then it stopped modulating USB and LSB.? Still puts out signal on tune and AM. Back to the service manual again.? I'm thinking of dirty relay contacts or a problem with a component in
the modulator board.?
Any recommendations?? This thing is providing more learning opportunities that I bargained for.
Tom KO4HNB
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Re: Electrolytics - FT-101B
Dang it.? Me again.
Got my 101B working.? Made QSO's in New Hampshire and Mississippi from VA. Then it stopped modulating USB and LSB.? Still puts out signal on tune and AM. Back to the service manual again.? I'm thinking of dirty relay contacts or a problem with a component in the modulator board.?
Any recommendations?? This thing is providing more learning opportunities that I bargained for.
Tom KO4HNB
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Re: Electrolytics - FT-101B
Hi Pat,
I bought mine back in the late 70's just getting started with my Novice license.? A career and decades later decided to get back into Ham radio.? For now, thinking about carefully checking it out.? Would hate to damage anything since it's been sitting for years.? Bought an ICOM-7610 but would love to get my first radio back online.??
Dan
--
73, KK7JNR
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Re: Electrolytics - FT-101B
My FT101B originally belonged to my dad.? I put it on the air every month or so, always on CW.? Decided to recap it to learn more about the radio and get better at soldering in tricky situations.? Finished the electrolytics (C78 and C77 were the last to do) today; and the radio appears to have lived through it.? Need to do some checking and maybe adjustment before putting it back on the air.? Hope to hear more about your projects.? Thanks again for checking for the phantom caps.
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Tom ai4th
Ron, N1BHE
Bruce Collins
Vince, KN6KKZ
Claude VE2YI
