Kenwood TM-32A

[Jeff Gasper]

I currently own a Kenwood TM-32A 2M/400 mobile radio and was
wondering if anyone knows how to enable the 800Mhz receive to function
properly after the conversion. The radio can receive from 410-470 Mhz
o.k. but not from 800Mhz-1Ghz. I think the problem has to do with a very
sensitive receive ability in that frequency range.
If anyone knows how to improve the receive in the radio without
major modification I would be very grateful. Please E-Mail any comments
or suggestions to...

Jeff Gasper N2WVJ
jsg...@rit.edu

I thank anyone with help for their time and effort.
Jeff Gasper N2WVJ
Telecommuniications Major at Rochester Institute of Technology

[Jeff Gasper]

In article <1995Mar24.1...@ultb.isc.rit.edu>, jsg...@rit.edu
says...

My mistake, I own a TM-732A by Kenwood. Not a TM-32A as I posted
earlier. Thanks to hid...@nd.edu for my mistake being noticed. If
anyone has any information on this radio's modification results, I am
still searching for information. Thanks to everyone and 73's!
Jeff Gasper N2WVJ

[CHRIS CONKLIN (N0PAV)]

In article <1995Mar24.1...@ultb.isc.rit.edu>, jsg...@rit.edu (Jeff Gasper) writes:
> I currently own a Kenwood TM-32A 2M/400 mobile radio and was
> wondering if anyone knows how to enable the 800Mhz receive to function
> properly after the conversion. The radio can receive from 410-470 Mhz
> o.k. but not from 800Mhz-1Ghz. I think the problem has to do with a very
> sensitive receive ability in that frequency range.

First, I assume you mean Tm-732A, since all Kenwood mobiles (hence TM-xxx) have
3 digit suffixs.

I don't know directly the answer to the 732, but being that Kenwood keeps their
radios (HTs-mobiles at least) very similar in design - I can tell you what the
sister radio (the TM-741) needs.
There are two RF switches that engage in response to which freq range you tune
to. The first switch in closed for 410-470, with one end attached to antenna
system (through diode, impedence matchings, etc etc). The other switch closes
(and the first opens) when you tune to 8xx Mhz.
Unfortunately, if 732 is like 741 there is no antenna (or anything) attached
to the other end of the switch. There is a "800" silk-screened on the PCB of
the 450 deck on the 741- which is where one should attach coax to another
antenna- or in a worst case scenario attach to the other antenna system and
suffer possible disadvantages (such as poor(er) 800 rx).

Again, I'm guessing. But check the schematic or the PCB of the 450 unit for a
pair of IC's, one of which has nothing attached to pin #1- between the antenna
network (found on the schematic adjacent to the power module) and the bandpass
filtering for 440 rx into the detector IC.

Good luck, es 73
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Christopher Conklin
Public Policy Masters Student: University of Northern Iowa
Net:Conkl...@uni.edu

Amateur Radio voice: 444.650Mhz n0pav/rpt
Amateur Radio packet: n0p...@ko0x-1.ia.usa.na

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