From: Eric Webner 
Subject: [drakelist] Re: Info R4C


Eric Webner  made an utterence to the drakelist gang
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Hello Francesco,
 
First, I must apologize for not writing back sooner. I hesitated in my
response to try to come up with a knowledgeable answer and have found
myself engrossed in repairing my T-4XC transmitter, which I have just about
finished.
 
After studying the manual, I believe you should start by checking the
voltage of each power supply. There are supplies providing 150 and 12
volts, as well as a negative bias supply. Also check your AGC circuits,
which serve to bias V1, V3 and V5 "off." If I understand section
4-7 of the manual, you should get about -40 volts on the AGC line when in
mute or standby modes. 
 
What does the radio do when you switch the AGC off?
 
Please post your questions to the drakelist also. There are guys on there
who know much more how to troubleshoot this radio.
 
73,
 
Eric KA8FAN


Frank  wrote:
Dear Eric
I have a receiver r4-c, that is broken last night
The S-meter in way "STY-BY " stops him to Half scale
. 

Positioning the switch on ON 
The S-meter Returns back and is positioned below the
0 (Under Zero) 
Not listen to you Nothing 
Where you think that the breakdown is found

Tnx for All 73 IK0IRE Francesco



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Hello Francesco,
 
First, I must apologize for not writing back sooner. I hesitated
in my response to try to come up with a knowledgeable answer and have found
myself engrossed in repairing my T-4XC transmitter, which I have just about
finished.
 
After studying the manual, I believe you should start by
checking the voltage of each power supply. There are supplies providing 150
and 12 volts, as well as a negative bias supply. Also check your AGC
circuits, which serve to bias V1, V3 and V5 "off." If I
understand section 4-7 of the manual, you should get about -40 volts on the
AGC line when in mute or standby modes. 
 
What does the radio do when you switch the AGC off?
 
Please post your questions to the drakelist also. There are guys
on there who know much more how to troubleshoot this radio.
 
73,
 
Eric KA8FAN
Frank
<radiovintage2000{at}yahoo.it>
wrote:
Dear EricI have a
receiver r4-c, that is broken last nightThe S-meter in way
"STY-BY " stops him to Half scale.
Positioning the switch on ON The S-meter
Returns back and is positioned below the0 (Under Zero)
Not listen to you Nothing Where you think that the
breakdown is foundTnx for All 73 IK0IRE
Francesco___________________________________
Nuovo Yahoo! Messenger: E' molto più divertente: Audibles,
Avatar, Webcam, Giochi, Rubrica… Scaricalo ora!
http://it.messenger.yahoo.it;
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Read only the mail you want - Yahoo!">http://us.rd.yahoo.com/mail_us/taglines/spamguard/*http://promotions.yahoo.com/new_mail/static/protection.html">Yahoo!
Mail SpamGuard.
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