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Author Topic: 101zd watts change per band  (Read 3101 times)
KB2WVO
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Posts: 382




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« on: October 14, 2017, 02:30:18 PM »

as title says. the tune up shows on 80 = 95ish to 100 watts moody she is. 40 = 75 to 80 watts. 20 if it breaks 25 watts iam lucky.. 17 = 70ish watts.

SWR's 80=1.7 , 40=1.1 , 20=1.5 , 17=1.1
no clue on this at all..
any ideas ??

101ZD MK3
« Last Edit: October 14, 2017, 02:33:10 PM by KB2WVO » Logged
AC5UP
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Posts: 4419




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« Reply #1 on: October 14, 2017, 03:40:09 PM »

Dirty or burned contacts on the bandswitch?  Give extra attention to the wafer(s) that work with the RF driver and power stages.

Might also clean & re-lube the bearings on the plate and load variable condensers.  Bandswitch would be my first check, but if a ground wiper on a variable condenser has developed a dead spot where 20 Meters ought to be it could do what you describe.  When you adjust the plate & load knobs does the meter move smoothly through the peaks and dips?  Not jumpy or erratic?  If so, that would tell you the variable condensers are probably OK.  Does the drive control increase / decrease the meter reading smoothly?

You'll also see someone suggest you look for oxidized star washers under the screws that ground the driver board to the chassis.  Same for the variable condenser mounting hardware.  Wouldn't hurt if they were cleaned and re-snugged...............
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HAMHOCK75
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Posts: 388




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« Reply #2 on: October 14, 2017, 05:51:07 PM »

My FT101EE had a similar issue. Every band was fine but 11M which was very low. Turned out the crystal oscillator for that band had not been properly adjusted so the output was low only on that band.
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KB2WVO
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Posts: 382




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« Reply #3 on: October 14, 2017, 10:34:20 PM »

AC5UP:
ty for info. will check switch and Vcaps.
the power on load and tune seem smooth.. meter doesnt jump unless i swing it quick.

HAMHOCK75:
yeah i should check alignment. never done it before. so thats new to me. been reading the service manual a lot.
i may just have to sit down and make it a winter project. it is 37 years old.
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G3RZP
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Posts: 8139




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« Reply #4 on: October 15, 2017, 01:54:56 PM »

You might have old and tired PA tubes.
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KB2WVO
Member

Posts: 382




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« Reply #5 on: October 15, 2017, 08:24:32 PM »

You might have old and tired PA tubes.
no clue. there 6146W's. if they give 100 watts on 80 and tired.. wouldnt they not give 100 watts at all ??

if it was a mono bander radio. i might say yep but i dont know.. you all are the teacher. iam just the student.
johnny 5. need input. input. lol
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AA4PB
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Posts: 14354




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« Reply #6 on: October 16, 2017, 06:43:24 AM »

Old tubes often provide less output at higher frequencies. Your output on 17M doesn't fit that scenario.
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Bob  AA4PB
Garrisonville, VA
KB2WVO
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Posts: 382




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« Reply #7 on: October 16, 2017, 04:00:47 PM »

Old tubes often provide less output at higher frequencies. Your output on 17M doesn't fit that scenario.


jumped upto 10 only gettin 60 out on a 1.8 swr .. lol think its goin to be a recap and then alignment winter project.
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KC4ZGP
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« Reply #8 on: October 16, 2017, 04:27:32 PM »


Hamhock,

Yours transmitted on 11 meters as well.

Hmmm...

Kraus
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HAMHOCK75
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Posts: 388




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« Reply #9 on: October 16, 2017, 05:09:02 PM »

That was standard issue for FT101's in the 60's & 70's. I was told Yaesu sold more FT101's than there were licensed hams.

Mine also came with the AM crystal filter and some of the 10M crystals had been removed and European CB band crystals installed. I guess CBer's in the 60's, 70's could do DX when the sunspot cycle was favorable, LOL!
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KB2WVO
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Posts: 382




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« Reply #10 on: October 16, 2017, 07:34:13 PM »

can a mod close this posting please..

ive had enough....

goin to find a good book and build a ncie warm fire. with the book. poof. i wont be reading no mor epostings in this post. ty for all the help

you all know who u r..
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