I have been thinking about getting my Ham technical license and have purchased ARRL book to help me and taking sample tests on QRZ site so was looking for a radio that I could multi purpose on I still enjoy 11 meters.. I am trying to talk a lot more SSB than am now and was using a Siltronix 1011C but I bought this Yeasu 101E with 11 meters and a am filter in it . I did this so I could use radio everywhere if possible. When I talk on am channel 27.165 I am heard on all 11 meter channels I can turn radio power level down but no difference. It does not seem to do this when in SSB lower or upper.so I can still use radio some. Any help would be appreciated to help me stop multi transmitting. Thank You Jimbo
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Yeasu 101e transmiting on all 11 meter channels at same time.
- Thread starter Jimbo165
- Start date
Has anyone you talk to miles away from you been able to hear your transmissions on other parts of the band at the same time you are trying to talk to them on 27.165 or is this something you are just experiencing on a radio sitting next to you on the bench?
OldTech03 the people telling me this are 5 miles away and it is more than one radio operator so must be my radio. I had one of them go to other channel when i went to Lower Side Band and they said they could not hear me on another channel in that mode. I just bought this radio and cannot return it. Thanks
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Ok, next question that I should have included in the first one. Are they able to hear you clearly on other frequencies and can they hear you on every position on the band or is it spread out say by 10KC increments or 30Kc increments or whatever the spread may be? I'm trying to narrow down if this could be internal spurious issues in the fundamental Harmonics range and I'm not at either yet frankly I wish it was sitting in front of me right now as I'm in the middle of testing a spectrum analyzer and other bench equipment but we will have to do it the hard way if we can. Are you sure about the AM filter on the surface one could think it has an unstable AM filter or maybe even a very bad AM filter?
I have the service manual on the laptop and when I find some time I will take a look it's been a while since I worked on one of these there may be others on here deeply familiar with these that may have run across this in the 101E I don't recall facing that issue on the bench before and I have worked on 100's of these but is was back when they were pretty new.
I have the service manual on the laptop and when I find some time I will take a look it's been a while since I worked on one of these there may be others on here deeply familiar with these that may have run across this in the 101E I don't recall facing that issue on the bench before and I have worked on 100's of these but is was back when they were pretty new.
If all else fails someone would pay good money to transmit on all channels at once. It's not a total loss.
OldTech03 they say i am heard pretty good on the other channels but i have not had someone key up my radio and me in a mobile to hear it myself i will do that very soon. I see it has a Am Filter XF-30b and a SSB XF-32A in radio and do not know how to check if good or bad. It has crystals 7.520- 16.020- 35-520- 35.020- 34.520- 34.020- 33.020- 27.020- 20.020- 13.020- 9.520 in radio right now. I wish it was on your bench as i have not the expertise to work on it but i have ordered service manual and we give it a rookie try for sure. I do not want to sell radio to someone just so they can transmit on all channels 543 Dallas because it has took me long time to just find this one. Thanks to all for your comments especially you OldTech03.
couple of questions,
are you sure you are tuning it properly?
The 101e is a different animal about pre-selecting and tuning.
how much power are you using on AM?.... 30 watts MAX!!!
be warned that this rig has lethal voltages both inside and outside.
there can be 600 volts on various internal points and also on the EXTERNAL plug jack sockets.
Road Squawker I have a Instruction manual and did best I could it is very hard to get this radio to run less than 50 watts am pep. I will try to go thru it all again tonight. I work on old tube linear's a lot so know about the zap factor for sure. I have a service manual coming . I really like this old radio a lot but no techs close around here that work on this type. It may become a shelf queen but I hope not. Thanks
I haven't kept a running count of all the FT-101 radios we have serviced the last 43 years. Might be a thousand, probably less.
Just the same, this is not a common symptom. First fault that comes to mind is neutralizing the final tubes. This adjustment is tricky, in part because the metal screw shaft you turn has voltage on it. Also, it's a bit finicky to set in the first place.
More than once we have seen a radio with two finals that the owner thought were a "matched pair". Closer inspection showed that even though both tubes had the same brand name printed on them, each was made in a different country.
To match the finals in a FT-101 they must come from the same factory assembly line. Every manufacturer of that tube would build it a little differently. The small mechanical differences become big RF differences. The tube was not designed for RF, so these properties were not precisely the same from one factory to the next. Those small differences had no effect on how it performed in a color TV.
But to make that radio's neutralization work properly, both tubes must be mechanically the same on the inside. Not a big trick to determine, just by comparing the shape and position of parts visible inside each tube.
The correct setting of that neutralizing adjustment is determined in part by those small mechanical differences. A tube from one factory will need the screw at one position. The other tube from a different factory would need that same adjustment turned a bit farther.
The result is that there is never one setting of that screw that will be right for both tubes at the same time. If you have discovered a forum post by someone who got frustrated with this procedure, this was probably the root of the problem.
But wait a minute! This probably has nothing to do with what's causing your fault.
If it tunes up , and the transmit is stable on sideband, the final tubes are neutralized well enough. If they aren't you'll see odd things like a "carrier" on the wattmeter in SSB transmit, even when you aren't talking. Or the meter readings will jump erratically when you turn the Plate Tune and/or Load controls during tuneup.
If they show a smooth peak when each control is turned while tuning up, the final tubes probably are NOT the culprit.
One big difference between sideband and AM in this radio is the modulation limiter. Yaesu calls it "ALC", as in Automatic Level Control".
But it only works on sideband.
Only.
IN AM MODE THERE IS NO MODULATION LIMITING OF ANY KIND!
None!
This leads to a suspicion that some part of the radio is being overdriven in AM transmit.
But not on sideband. The radio will hold itself below the overdrive point in sideband.
This 'wide open' quality of AM transmit mode in this model has a lot do with its popularity for 11-meter AM.
This problem probably isn't so simple as just "Turn down the mike gain".
But a block diagram of this radio's transmitter will reveal that it has more than one circuit that can become overdriven, way upstream from the final tubes.
Just be sure that the Preselect, Plate Tune and Load controls are all set for max.
NEVER, NEVER, NEVER use those controls to 'turn down' the radio. They must be tuned for max power. This is what tunes them to the frequency you're using.
The Carrier knob is the only one that should serve to set the radio's power level for AM.
I do hope that's how you were tuning it. The instruction manual's procedure is a bit obscure, and was written for an operator who does NOT have an inline RF wattmeter connected.
Much better to peak those three knobs for max RF wattage. A different setting could cause odd things to happen.
73
Just the same, this is not a common symptom. First fault that comes to mind is neutralizing the final tubes. This adjustment is tricky, in part because the metal screw shaft you turn has voltage on it. Also, it's a bit finicky to set in the first place.
More than once we have seen a radio with two finals that the owner thought were a "matched pair". Closer inspection showed that even though both tubes had the same brand name printed on them, each was made in a different country.
To match the finals in a FT-101 they must come from the same factory assembly line. Every manufacturer of that tube would build it a little differently. The small mechanical differences become big RF differences. The tube was not designed for RF, so these properties were not precisely the same from one factory to the next. Those small differences had no effect on how it performed in a color TV.
But to make that radio's neutralization work properly, both tubes must be mechanically the same on the inside. Not a big trick to determine, just by comparing the shape and position of parts visible inside each tube.
The correct setting of that neutralizing adjustment is determined in part by those small mechanical differences. A tube from one factory will need the screw at one position. The other tube from a different factory would need that same adjustment turned a bit farther.
The result is that there is never one setting of that screw that will be right for both tubes at the same time. If you have discovered a forum post by someone who got frustrated with this procedure, this was probably the root of the problem.
But wait a minute! This probably has nothing to do with what's causing your fault.
If it tunes up , and the transmit is stable on sideband, the final tubes are neutralized well enough. If they aren't you'll see odd things like a "carrier" on the wattmeter in SSB transmit, even when you aren't talking. Or the meter readings will jump erratically when you turn the Plate Tune and/or Load controls during tuneup.
If they show a smooth peak when each control is turned while tuning up, the final tubes probably are NOT the culprit.
One big difference between sideband and AM in this radio is the modulation limiter. Yaesu calls it "ALC", as in Automatic Level Control".
But it only works on sideband.
Only.
IN AM MODE THERE IS NO MODULATION LIMITING OF ANY KIND!
None!
This leads to a suspicion that some part of the radio is being overdriven in AM transmit.
But not on sideband. The radio will hold itself below the overdrive point in sideband.
This 'wide open' quality of AM transmit mode in this model has a lot do with its popularity for 11-meter AM.
This problem probably isn't so simple as just "Turn down the mike gain".
But a block diagram of this radio's transmitter will reveal that it has more than one circuit that can become overdriven, way upstream from the final tubes.
Just be sure that the Preselect, Plate Tune and Load controls are all set for max.
NEVER, NEVER, NEVER use those controls to 'turn down' the radio. They must be tuned for max power. This is what tunes them to the frequency you're using.
The Carrier knob is the only one that should serve to set the radio's power level for AM.
I do hope that's how you were tuning it. The instruction manual's procedure is a bit obscure, and was written for an operator who does NOT have an inline RF wattmeter connected.
Much better to peak those three knobs for max RF wattage. A different setting could cause odd things to happen.
73
1ST thing is it is a YAESU not a YEASU. 2ND thing is check the crystals & make sure they are correct for the position of the band switch because you can plug any crystal into either of the spots in the radio & it does not know any difference. I know some did not do the 11 meter mod so they use the 10 meter positions for the 11 meter crystal.I had a 101EX & the 11 meter crystal was in the 1ST 10 meter slot & nothing in the 11 meter slot. The Top portion of the 10 meter band is useless since the radio does not have FM so they moved the other 10 meter crystals each up one spot. Just like the optional digital display it just shows the frequency for the band it thinks you are on.
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