开云体育

ctrl + shift + ? for shortcuts
© 2025 开云体育
  1. Yaesu-FT-101
  2. Topics

FT-101EE component question

 

Hello group,

I have an FT-101EE (1976 vintage I believe)

I have noticed the capacitor in the C103 position is a 1000uf 25v, whereas the
schematic calls for a .047uf to be there.? Schematic also shows this as being a
non-electrolytic, whereas mine is.

C-103 connects to the T12 transformer on the bottom of the chassis.

So, question is...what is the proper cap there?


Thanks!


MIke
KD7VRG
Tucson, AZ
 

They are both supposed to be there. One is s simple RF ground. The?electrolytic cap is “grounded” through the lamp bulb. But it is wired with the positive lead grounded through the bulb.?

Look at it carefully.?
 

Bruce, Thanks for the reply, but I don't think you got the gist of my question.

I wasn't asking if it should be there. I was asking about the huge disparity between
the values of what I actually see in the radio vs. what the schematic calls out.


Mike
KD7VRG
Tucson, AZ
 


Mike

C103? -? 0.047 uf
C 148? - 10uf
C 152? - ? 1000uf

Emerson
PP6EW

Em ter., 20 de jun. de 2023 às 20:32, mikemm58 <mmcauley@...> escreveu:

Hello group,

I have an FT-101EE (1976 vintage I believe)

I have noticed the capacitor in the C103 position is a 1000uf 25v, whereas the
schematic calls for a .047uf to be there.? Schematic also shows this as being a
non-electrolytic, whereas mine is.

C-103 connects to the T12 transformer on the bottom of the chassis.

So, question is...what is the proper cap there?


Thanks!


MIke
KD7VRG
Tucson, AZ

 

开云体育

Ok thanks Emerson. Can you help with the location of C152?


Thanks



Mike


-------- Original message --------
From: Emerson PP6EW <bunhoel@...>
Date: 6/20/23 7:04 PM (GMT-07:00)
Subject: Re: [Yaesu-FT-101] FT-101EE component question


Mike

C103? -? 0.047 uf
C 148? - 10uf
C 152? - ? 1000uf

Emerson
PP6EW

Em ter., 20 de jun. de 2023 às 20:32, mikemm58 <mmcauley@...> escreveu:
Hello group,

I have an FT-101EE (1976 vintage I believe)

I have noticed the capacitor in the C103 position is a 1000uf 25v, whereas the
schematic calls for a .047uf to be there.? Schematic also shows this as being a
non-electrolytic, whereas mine is.

C-103 connects to the T12 transformer on the bottom of the chassis.

So, question is...what is the proper cap there?


Thanks!


MIke
KD7VRG
Tucson, AZ

 

Mike

there are many different versions of FT-101.
Look the schematics at:
alignment manual.pdf

73

Emerson


Em ter., 20 de jun. de 2023 às 23:12, mikemm58 <mmcauley@...> escreveu:

Ok thanks Emerson. Can you help with the location of C152?


Thanks



Mike


-------- Original message --------
From: Emerson PP6EW <bunhoel@...>
Date: 6/20/23 7:04 PM (GMT-07:00)
Subject: Re: [Yaesu-FT-101] FT-101EE component question


Mike

C103? -? 0.047 uf
C 148? - 10uf
C 152? - ? 1000uf

Emerson
PP6EW

Em ter., 20 de jun. de 2023 às 20:32, mikemm58 <mmcauley@...> escreveu:
Hello group,

I have an FT-101EE (1976 vintage I believe)

I have noticed the capacitor in the C103 position is a 1000uf 25v, whereas the
schematic calls for a .047uf to be there.? Schematic also shows this as being a
non-electrolytic, whereas mine is.

C-103 connects to the T12 transformer on the bottom of the chassis.

So, question is...what is the proper cap there?


Thanks!


MIke
KD7VRG
Tucson, AZ

 

Ok I think I found the answer.

My manual, in Section 6 "MODIFICATIONS", page 6-21 & 6-22
describes a fix for "Hum Problems", and calls for the addition
of a 1000uf/25v electrolytic on T12 to ground (which is what I have)

So some owner in the past probably made this mod.

Mike

1 - 7 of 7