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World of Ham Radio 1997
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1997-02-01
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Subject: Any mods for Yaesu FT736R?
Summary: Lots of things to play with on ur 736
I modified mine. There's a catch tho - the mod involves adding a pair of
switches to the module-address lines into each of the rf modules..it's
kinda funky but it does work. Look at your schematic, then wire up the
switches such that your 6m and 2m modules *think* that they're 440MHz
modules! The trick then is to look at the display, which reads 443.000,
and mentally adding 6.0 such that you know the real frequency is 449.000MHz.
Similarly, the display will read 445.000 when the 2m module is really at
145.000. When you finish adding the switches, you'll have to powerup the
'736 with the switches in the 'extended range' position. Then use one of
your existing memory frequencies, transferred to either the A or B vfo, to
then bandswitch up or down to the 440 band. Bingo! If you goof, the
display will read "error". Start over by powering down, and then repeat
the procedure. Sometimes the frontpanel logic will simply lock, just start
over and it will eventually work. Mine never takes more than 2 tries. With
the switches in the 'normal range' position the '736 will function as a
stocker.
The range for the 6m unit is therefore 46-56 MHz, and the 2m unit will
give you 140-150 MHz. Yes, the transmitter will also work this span, but
keep in mind a 10 watt signal on the 49 MHz band sticks out like a sore
thumb! ;-) ("Wow! Listen to *that*! He must have a better walkie-talkie
than these RadioShack junkers!") ;-)
My attempts to modify the range on the 430 MHz rf module have not meet
with much success, and a careful look at the schematics/numbers tell the
story quite well; The module covers 430-440, a 10MHz range. Therefore,
the address-line trick will yield no more coverage.
Have Fun, 73! --
-Avatar-> KB6LUY +-------------------------+
%
Note: I haven't tried or verified this, proceed at your own risk!
WA2ISE
And don't transmit outside your licesned bands!
----------------------------------------------------------------------------
Here is a diode mod for frequency spread. If you come up with any thing
better, Please let me know. I would like to make some mods to my 736R also.
The FT-736R MARS/CAP Operation Modification 4/22/89
The following DIODE installation or omission on the 144MHZ Main Unit will
change the 144MHZ frequency spread of the FT-736R.
D24 | D25 | D26 | D27
----|-----|-----|-----
X | O | O | X -- 144.0 - 148.0 MHZ
----|-----|-----|-----
X | O | O | O -- 141.0 - 154.0 MHZ
----|-----|-----|-----
X | X | O | O -- 144.0 - 146.0 MHZ
" X " = OMIT
" O " = INSTALLED
I hope this is some help. My name is Mike, and the call is WF8B.
My home PBBS is NK8T in OHIO. Good luck and 73.
de Mike WF8B @ NK8T Loveland, Ohio, USA.