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Subject: VX-5R Expanded frequency

Date: Fri, 16 Apr 1999 19:18:51 -0500



VX-5R Expanded frequency



Remove the battery pack, beneath where the pack was, is a black cover

(heavy duty paper) it's just stuck and is removable to install the

optional barometer/temperature-0 module.



Remove this and you'll see 8 solder pads, for some reason some have 3

pads bridged, in my case there were 4 bridged. In either case unsolder

the 5th pad counting right to left. Do a full reset, the HT is now

open.



 This worked fine on my VX-5R, but you are on your own.



K9UO



----------------------------------------------------------------



Dear Fellow HAMsters,



I just traded my FT-51 for the tri-band VX5. This radio is a marvel. I

like the advanced features like selecting the receive mode (narrow,

wide or am). Anyways, this radio is locked up pretty well if no

modification has been done. I found some mods on the internet but all

of them were the MARS/CAP mod. So, I decided to experiment with my

radio and find the full mod. As usual, yaesu was kind enough to provide

us with a schematic diagram of the radio. I glanced at the schematic

and after finding the section regarding the jumpers on the back of the

radio, it was quite obvious what needed to be done. First, take the

battery out. In the upper half of the battery compartment, there is a

black piece of paper covering the radios circuitry. Remove it by

lifting it from the side with your fingernail or flat-head etc...DO NOT

THROW IT AWAY.  In case you're wondering why there is a hole in your

radio, its for the altimeter/barometer gadget you can add to your

radio. After removing the black piece of paper, you will see 8 solder

pads going across the bottom. On my radio, the middle two solder pads

were shorted. If you unsolder the fourth solder pad counting from the

left, you will do the MARS/CAP mod. If you unsolder all of the pads,

you will open up your radio. Now I must say that the full mod on this

radio isnt a FULL mod - its nothing like the FT-51. Unfortunately, the

radio is somewhat handicapped by the microprocessor and there is

nothing you can do(unless you plan on replacing the microprocessor).

When I did the full mod on my FT-51, it could receive almost everything

(fm radio was garbled because of narrow bandwidth) and it could

transmit on a whole range of frequencies including 900 MHz. This isnt

the case with the VX5. In fact, you cant even enter certain

frequencies. If you enter lets say 35 MHz, the radio will beep and it

will return to your previous entry. Also, the radio skips over 868-890

which prevents you from listening to cell phones.



Anyways, the FT-51 was a sweet radio...too bad too sad!!



At least you can listen to radio, shortwave, and tv on the VX5. OH,

one interesting thing - NOT that I did it - but, you can transmit

on CBS (59.7 MHz) and if you're close enough to the TV antenna you

can hear your voice on the TV.



-hrach

KF6PEM



P.S. Here is a list of exactly what you can receive and transmit.



RX:

.53-16

48-728

800-999



TX:

48-66

108-222

305-577



P.S. #2

When you try to transmit on the frequencies not listed above, the

radio gives a TX error. Now this might be good news, because this

means that the radio is still somewhat locked and that the TX error

is not because the radio is incapable of transmitting. Maybe there

is another modification which can be done to allow this

transmission. If anybody finds out, please email me at

hrachs


P.S. #3

Please be careful when modifying your radio. Although this mod

should be fine with all VX5's, your's might be different! Also,

make sure you dont leave any extra solder in the radio. Little bits

can splatter here and there and to your luck, it might land on the

pins of the microprocessor. Anyways, I better wrap this up - 7 am

its almost bedtime. Have fun and DONT transmit illegaly.



-hrach



-----------------------------------------------------------



From: "Glenn" 

SOURCE: The QRZ Windows Ham Radio CDROM



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