[Moon-Net] FT-736R how to adjust 23cm frequency?

Richard W. Solomon w1ksz at earthlink.net
Thu Nov 24 22:38:28 CET 2016


Before you start tweaking, I suggest you verify that your counter is
accurate. 

 

A simple GPSDO, with a 10 MHz output, can serve as your counter Reference 

Input. That will ensure you have accuracies that are as good as you can get.

 

73, Dick, W1KSZ 

 

From: moon-net-bounces at mailman.pe1itr.com
[mailto:moon-net-bounces at mailman.pe1itr.com] On Behalf Of Simon Lewis
Sent: Thursday, November 24, 2016 2:25 PM
To: Dirk Reyners; moon-net at mailman.pe1itr.com
Subject: Re: [Moon-Net] FT-736R how to adjust 23cm frequency?

 

Dirk 

 

I am pretty sure the MO on the main IF unit is the one to aim for

 

I had 2 x 736rs with the same issues

 

If I remember the MO is multiplied - so a few Hz off at 144 is much larger
at 432, is larger again at 1296 

 

I ended up stacking polystyrene around the master oscillator can and trying
to keep the radio as stable as possible by leaving it on or turning it on
well before operating 

 

I am pretty sure from memory the master osc drives all modules hence the
issue

 

Kinda hope that helps!

 

Cheers

 

Simon  

 

 

Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986>  for Windows
10

 

From: Dirk Reyners <mailto:dirk.reyners at telenet.be> 
Sent: Friday, 25 November 2016 12:55 AM
To: moon-net at mailman.pe1itr.com
Subject: [Moon-Net] FT-736R how to adjust 23cm frequency?

 

Hi Group,

This evening we tried to calibrate my FT736R on 23cm, the frequency is 
2,6KHz off. (if you watch the pictures we set 1296.300 and counter says 
1296.2974

Very annoying in E.M.E....

The 144MHz and 432MHz transmitters are +/- a few Hz bang on frequency.

I opened the optional 23cm module to find out which screw to turn but, 
nope... no result

these are photos from the module

https://photos.google.com/photo/AF1QipOFOI3ghJ1kRXI8DoS1_qWZOSO5yigafyAirmlW

https://photos.google.com/photo/AF1QipME0uD3er7_4qPN8_Emlgz2eFcE2HV5QbNp2xiw

https://photos.google.com/photo/AF1QipPNDynDquUoT7_mUN2XRI2z0Y8BjCR9LplAINZO

http://www.foxtango.org/ft-library/FT-Library/Eighties/FT-736R_Tech_supp.pdf

anyone done this before?

I tried Q14, nope

TC01 caused a fast frequency drift of 300KHz downward so quickly put it back

Would be soooo nice to have my rig on frequency

Best 73! ON5GS Dirk



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