Re: [amsat-bb] transverter if radio mods

[K5OE@xxxxxxx]

Drew,
Here is the mod for frequency expansion.  I think I got this off the qrz site 
about 5 years ago.  It is a 10 minute job, giving you 26-29.999 MHz 
capability. I have done this mod for the same reason (interfaced the rig to a 
Ten-Tec 1210 transverter and needed 29.800-29.999 -> 145.800-145.999 uplink). 
 Be aware this mod makes the last digit in the LED display a little flaky and 
you cannot tune easily with the lowest VFO increment setting (I just used the 
RIT knob most of the time anyway since it is smoother than the "steps" on the 
VFO).  The mod is easily revesable if you want to change it back before 
selling the rig.

--------------------
Remove bottom cover. With the radio upside down and display facing you remove 
the synthesizer board with the four screws, this is near the front of the 
radio.

This gives access to the small board underneath with the surface mount 
components on it. Locate the processor chip IC401 (UC-1208).Locate pins 28 
and 
29 which are on the right hand side of the chip and are 4th and 5th from the 
top. Note they are bridged with solder. 

CAREFULLY cut the copper track NEXT to the pins. DO NOT attempt to unsolder 
the two pins form the board. Use a GROUNDED soldering iron. Locate the two 
rows 
of connector pins above the chip. 

On the bottom row locate the last pin on the right. Verify with a VOM that 
this pin has + five volts. Solder a 10k (1/4 w) resistor between this pin and 
pins 
28 and 29 on IC401.The synthesizer will now tune from 26.00 Mhz to 30 Mhz.
---------------------------
73,
Jerry, K5OE


In a message dated Wed, 20 Dec 2000 11:54:37 PM Eastern Standard Time, "Drew 
Glasbrenner" <glasbrenner@mindspring.com> writes:

<< I have a HTX10 that I am hoping to mate to a 435 transverter or receive
converter. Has anyone figured out how to open up 29.7-30.0 on these rigs. It
would be nice to be able to work all the sats without switching xtals.

Any info would be appreciated. Any leads on a transverter would be great
too.

73
Drew KO4MA

http://www.hotboards.com/plus/plus.mirage?who=ko4ma

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