
> I recently purchased a Yaesu FT-530 HT at the Seaside Hamvention and am 
> interested in finding the method of expanding the receiver tuning range.
> Does this also expand the xmit range, putting me at risk of accidental
> xmit outside of the appropriate band edge?
> Or is their a separate transmit mod for CAP, MARS, ect?
> I would like to have information on any or all possible mods.

This is what I got when I bought my 530:

Mod for expanded transmit 130-180, 400-460 MHz
        expanded receive  110-180, 300-500 MHz

1. Remove Battery.
2. Open up the case.
3. Remove the white plastic insulator.
4. Remove solder dot from jumper pad 13 (located on the lower
   right corner of the main processor board; attached to the
   keyboard side of the case.)
5. Close up the radio, careful not to pinch the ribbon cable. Be
   sure to replace the white plastic sheet.
6. Turn on the radio while holding down both the up and down
   arrow keys.
7. Modification complete.

(Yaesu revision 1-20-93)

Give this a try; it seems to work fine with my radio.  I use it
to listen to the air band without any problems at all.

-Bill

--
 Bill Bencze                               bencze@isl.stanford.edu




Carefully open the radio by removing the screws holding the case together as well as the four
tiny screws on the battery connector slide.  Split the radio apart and remove the cardboard
from the front side of the radio.  NOTE HOW THE LITTLE METAL TAB STICKS THROUGH THE CARDBOARD
FOR PROPER REASSEMBLY!!!!

Locate the solder jumper pad near the bottom of the radio (there are some numbers on it).

You can do one of two mods -- the receive only or the receive transmit.


Either mod will give you extended receive from 108 to 174, 350 to 500, and 800 to 912.

The transmit mod enables about 130-170 and 420 to 465 (about).


Remove ONLY solder pad 13 to enable both extended receive and transmit.
Remove ONLY solder pad 15 to enable the extended reveive only.

Make sure to use a VERY low wattage solder iron and sucker.  I used the $8.95 Radio
Shack solder remover (like a soldering iron with a sucker bulb) with great success.  DO NOT
USE DE-SOLDERING WICK!!!!



In article <1993Jun09.185705.25169@microsoft.com>, frede@microsoft.com (Frederick Einstein) writes:
|> ...Shack solder remover (like a soldering iron with a sucker bulb) with great success.  DO NOT
|> USE DE-SOLDERING WICK!!!!

When issuing pronouncements such as the above, it might help to offer
some explanation or justification for your apparently strong opinion.

In my experience working on surface-mount boards, I have found that
solder wick is much preferable to a solder sucker.  Why do you suggest
[hint] not using it?


Michael Sleator (KD6VBQ)        Voice:          408-748-6339
Kubota Pacific Computer         FAX:            408-748-6301
2630 Walsh Ave.                 internet:       sleat@kpc.com
Santa Clara, CA  95051          uucp:           ...!uunet!kpc!sleat





This is a compilation of modification information I received in response to 
my posted query and the info faxed to me by Yaesu.

There are at least 2 board layouts out there.
Note that while the jumper pad numbers have not changed, the board positions
of the pads have.



YAESU FT-530

Expanded Receive 110-180, 300-500 MHz
Expanded Transmit 130-180, 400-470 MHz

NOT LEGAL IN U.S.A - FOR EXPORT ONLY (The expanded transmit part)

o Keep that magnifying glass handy! 8-)
o Be aware that your repeater memories, ect. will be erased. :-(
o Remove Antenna and Battery.
o Remove four screws on bottom holding battery track.
o Remove the four (black) screws holding rear case.
o Slowly... open the front cover from tranceiver and lay both halves on 
  table.
o Note positioning of white paper insulator in right half of radio and 
  lift out
  (don't throw away)

o Carefully locate Jumper Pad 13 and remove solder.

-----------------------------------------------------------------
o NOTE: If you wish to restrict transmit to the ham band, 
  Carefully locate Jumper Pad 15 and remove solder.
  Otherwise, leave pad 15 in place.
-----------------------------------------------------------------

o Re-install white paper insulator, make sure ground tab slides through the 
  paper insulator.
o Close radio back up (Careful not to pinch the ribbon cable near lithium 
  battery when closing halves).
o Re-install the four (black) screws holding rear case.
o Re-install the four (small silver) screws on bottom holding battery track 
  to radio body.
o Attach Antenna and Battery.
o Turn off Radio.... Press and hold both arrow keys while turning on the 
  Radio.
o Modification Complete.

------------------------
|                      |
|                      |
|                      |
|                      |
|           ---        |
|           | |        |
|           ---       /                     rev. 12-21-92
|           ---      /                 
|           | |     /                         2 (|)  (|) 1
|           ---    /                          4 (|)  (|) 3
|                 /  <---  Jumpers are here   6 (|)  (|) 5
|              o /                            8 (|)  (|) 7
-----------------             Blowup --->    10 (|)  (|) 9
                                             12 (|)  (|) 11
                                             14 (|)  (|) 13
                                             16 (|)  (|) 15


					     
------------------------
|                      |
|                      |
|                      |
|                      |
|           ---        |
|           | |        |
|           ---       /                     rev. 5-14-93
|           ---      /                 
|           | |     /                           (|)  (|)
|           ---    /                            (|)  (|)
|                 /  <---  Jumpers are here     (|)  (|)
|              o /                              (|)  (|)
-----------------             Blowup --->       (|)  (|)     __
                                             12 (|)  (|) 11 |  | 6 pin mini IC
                                                     (|) 13 |__|                                            
                                             16 (|)   [] 15
					              []   
					
				Pad 15 now a vertical pad with a tiny
				"zero ohm" resistor.


My rig got confused after this mod and it was neccessary to reset the 
CPU. (The 70cm repeater offset register got fouled up and though it could 
be incremented and decremented by the normal 50khz, 
it went 0.01mhz, 0.06, 0.11, ect. instead of 0.00mhz, 0.05, 0.10, ect.).

Reset command: turn radio on while holding "MR" and "FM"
(Damn, memories erased again!)

If anyone figures out how to receive higher freqs, say up to 800-950mhz,
(so I can listen to the 900mhz ham band of course),  8-)
please let me know!

Thanks

Genew@techbook.com





Gene Wolford (genew@techbook.techbook.com) wrote:


: If anyone figures out how to receive higher freqs, say up to 800-950mhz,
: (so I can listen to the 900mhz ham band of course),  8-)
: please let me know!

Thanks to the person who pointed out by email that the pad 13 mod DOES
allow 900mhz ham band reception. Yaesu does not admit it or like to talk
about it. Because it's verbotten to listen on cell phone freqs.
I could not care less about listening to yuppies driveling on their 
beloved cell phones but it might be nice to receive the 900mhz band,
(when useage picks up).

-- 
	    Those who beat their swords into plowshares
             are destined to plow for those who don't. 
			genew@techbook.COM 
Please direct flames to: genew@ucant.gethere.frmhere
