QRZ! Ham Radio 16/QRZ_16.iso/modfiles/tmv7a.txt

Internet Message Format | 2000-10-29 | 4KB

From: [e-mail] (MR CORY B MCDONALD)
Date: Sat, 31 Jan 1998 22:25:46, -0500
To: [e-mail]
Subject: Mars/Cap mod for Kenwood TM-V7A

   Remove the top and bottom covers and the detachable
face holder. Look at the p c board that is vertical behind
the front of the radio. There will be 2 small chip resistors
on the left side of the board. Carefully remove the one
with the number 0 . It will be the one closest to the left
near the grounding spring. You will probably have to scrape it off
with a pair of needle nose pliers. After you remove it
the TX should be VHF TX 136.995 - 173.995. RX should
be 118-174. UHF TX should be 410-469.995 RX should be
300-470.

---------------------------------------------------------
From: "Bowyer, Mike J" <[e-mail]>
To: [e-mail]
Subject: Expanding the Kenwood TM-V7: A & E versions

Original TM-V7A Mod from [e-mail] (MR CORY B MCDONALD)
Additional TM-V7E notes from [e-mail] (Mike Bowyer)


Original TM-V7A Mod:
--------------------

Remove the top and bottom covers.

Look at the vertical p.c. board behind the front of the radio. There will be
2 small chip resistors on the left side of the board.

Carefully remove the one with the number 0. It will be the one closest to
the left near the grounding spring. You will probably have to scrape it off
with a pair of needle nose pliers.

After you remove it the VFO ranges should be:
VHF TX 136.995 - 173.995. RX should be 118-174.
UHF TX should be 410-469.995 RX should be 300-470.



Additional TM-V7E notes:
------------------------

There is a row of five numbered links on the edge of the front panel board.
In my E version radio, 0, 2 & 3 were made as standard. I now have only one
link fitted in the number 4 position which enables the repeater function not
defaulted in European versions. I have removed all other links.

I can now also receive the AM Aircraft band (118-137MHz). It is possible to
change from AM to FM by pressing the MHz button for 1 second. Plus I have
discovered doing the same key press (MHz for 1s) in the UHF band gives a
800-999Mhz RX band.

The European version has a 1750Hz tone-burst function, a modified band plan
for the auto-repeater shift function, adds a -7.6Mhz repeater shift and sets
the band limits to 144-146 & 430-440 - the AM Air band & 800Mhz bands are
disabled. All these European 'features' are lost when the radio is expanded.
(The repeater offsets are still programmable, but you must learn how to
whistle at 1750Hz). I think the only other difference between the A and E
versions is that the E version has an N type antenna connector fitted.

Making link number 5 causes the radio to power up in a Memory recall mode
(i.e., with channel numbers) and so is not overly useful!

I'm not sure exactly what links 0, 1, 2, & 3 all do individually! Maybe
other configurations are possible: any information would be gratefully
received.

As for RF performance, the front-end (and PA) must be tweaked to use
frequencies other than the factory alligned defaults, with a little tweaking
out of band performance should come good (at the expense of regular 2m/70cm
performance).

The chip resistors are SMD zero ohm things - a wire link (or solder blob)
will do the same job. They can be carefully removed (for re-use) by using a
fine tipped iron, de-solder braid, and a pair of long nose pliers or
tweezers. The front board can be carefully detached from the rest of the
radio to make removing the links easier.


Mike Bowyer.
[e-mail]