Call Search
     

New to Ham Radio?
My Profile

Community
Articles
Forums
News
Reviews
Friends Remembered
Strays
Survey Question

Operating
Contesting
DX Cluster Spots
Propagation

Resources
Calendar
Classifieds
Ham Exams
Ham Links
List Archives
News Articles
Product Reviews
QSL Managers

Site Info
eHam Help (FAQ)
Support the site
The eHam Team
Advertising Info
Vision Statement
About eHam.net

   Home   Help Search  
Pages: [1]   Go Down
  Print  
Author Topic: Yaesu FT-736R Mic Not Keying  (Read 1719 times)
AK4RL
Member

Posts: 11




Ignore
« on: June 19, 2011, 12:12:01 AM »

 Sad   I recently acquired a nice looking Yaesu FT-736R that was sold as a working radio (not from ebay).  He kept his Heil mic and cord and did not have the original mic.  Since I have always been an Icom and Kenwood fan, I did not have any Yaesu mics around.  I bought an adapter cable for Kenwood 8 pin round to Yaesu 8 pin round and hooked it up and got nothing.  If you press the MOX button, the radio keys and if you short pin 6 (PTT) to ground the radio keys.  I figured bad adapter so I bought a MH-31 Yaesu mic and still the radio will not key.  I then did a total reset but no change.  Any suggestions as to what I should check now?  Any strange combination of buttons on the FT-736R that I must punch?  Would appreciate your help. TNX and 73, Ray AK4RL
Logged
AC5UP
Member

Posts: 3845




Ignore
« Reply #1 on: June 19, 2011, 12:41:48 AM »

Can we assume the MH-31 hasn't been adapted to something different than an FT-736R? If you connect an ohmmeter to the mic plug between what would be pin 6 and ground, does it show wide open until you squeeze the PTT, then it drops to a dead short?

If you can key the radio with a jumper across the mic plug I'd say the problem is in the mic.
Logged

Never change a password on a Friday                
K2DC
Member

Posts: 1354


WWW

Ignore
« Reply #2 on: June 19, 2011, 03:54:50 AM »

Ray,

   Older Yaesu's used a common ground for MIC and PTT on pin 7.  Newer rigs and mic's use separate grounds, pin 7 for MIC and pin 5 for MIC.  You may need to open the connector on the mic and rewire it, or rewire your adapter.  Pin 8 is MIC, pin 6 for PTT and pin 7 is ground for both.  The 736R manual is available at:

http://ketel.home.xs4all.nl/ham/FT736/FT-736R_Manual.pdf

GL & 73,

Don, K2DC

Logged
AK4RL
Member

Posts: 11




Ignore
« Reply #3 on: June 19, 2011, 01:34:41 PM »

I checked today and the transceiver does key using the VOX. The mic is wired for standard 8 pin round Yaesu. Thanks for your comments, 73 Ray AK4RL
Logged
WB2WIK
Member

Posts: 20574




Ignore
« Reply #4 on: June 19, 2011, 02:42:49 PM »

You need to re-wire the mike to make the PTT work with the 736R.

At least you confirmed there's really nothing wrong with the rig, at all.

I use a boom mike and a footswitch with my 736R so hadn't thought about this for a long time, but it's true Yaesu changed their wiring over the years and "new" Yaesu mikes are not compatible with 1980s Yaesu rigs like the 736R.
Logged
Pages: [1]   Go Up
  Print  
 
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.11 | SMF © 2006-2009, Simple Machines LLC Valid XHTML 1.0! Valid CSS!