[amsat-bb] Re: more about the TH-D72A for satellites

Jeff Yanko wb3jfs at cox.net
Fri Dec 10 00:37:11 PST 2010

Hi Patrick and all,

Seems the TH-D72A is pretty much a replica of the TH-D7(A) with some minor 

One word of caution on spliting the audio at the HT.  DON'T DO IT.

Let me explain.  I have the TH-D7(A) and used a plug adaptor to go from the 
1/10", 2.5mm, recepticle to 1/4" for the headphones.  Everything worked 
great, for about a year, then I noticed the audio was cutting in and out. 
Turns out the weight of the adaptor and sometimes I used a splitter to 
record, made the contact very poor.  Now if I plug in the HMC-3 head set 
there isn't a problem since the two plug system, Speaker-Mic jack, holds and 
maintains the connection very well.  If I go back to the single audio out 
plug, the problem resurfaces.

What you could possibly do is find and solder a 1/10, 2.5mm, plug to a wire 
then run a couple feet to the splitter so there will be little or no weight 
on the recepticle at the HT.

Figured I'd save others from a headache.


Jeff  WB3JFS
Las Vegas, NV

----- Original Message ----- 
From: "Patrick STODDARD (WD9EWK/VA7EWK)" <amsat-bb at wd9ewk.net>
To: <amsat-bb at amsat.org>
Sent: Monday, December 06, 2010 9:57 AM
Subject: [amsat-bb] Re: more about the TH-D72A for satellites

Hi Bob!

> I, too, have been considering "retiring" my TH-D7A(G), and you just sold 
> me
> on the new Kenwood after our contact on AO-51. Sounded great.

Several commented on my audio during the two passes I worked, as well as
"selling" them on the new radio.  If a bunch of D7s show up for sale, maybe
a few of them will end up in the hands of those interested in working

> Ordered mine from HRO a few minutes ago. Also got the drop in charger.
> Since they changed battery to a Li-ion, the D7A charger (NiCad) will
> not work. Hope these new batteries last longer than the old NiCad's.

Do you have a drop-in or fast charger for your D7?   I think the wall-wart
charged my battery in 4 or 5 hours on Saturday night. The battery had a
partial charge in it, enough to power on the radio and perform a full reset
before letting it charge fully.  I haven't looked at the model numbers for 
the accessories closely, since so few of them are in the stores now.  I'll 
some of them as they arrive in the stores on the slow boat from Japan.

I have an old Kenwood speaker/mic, and the external power cables are
the same as for the TH-F6A and TH-D7 (among others), so I had all the
accessories I could get for the radio right now.  I didn't use the 
yesterday; I used the mic on the face of the radio, and plugged my audio
splitter (including adapter to step down from the 3.5mm plug on the splitter
to the 2.5mm speaker jack on the HT) with earpiece and audio recorder
into the speaker jack.

I've read the other posts on this thread, and I will take a look at the DUP
setting when I get home tonight.  It is possible that the way I had it set 
(transmit on VFO B, receive on VFO A) is the only way it works on the
D72.  If that is the case, then Kenwood did it right by their choice of VFO
A having to be the receiver when in DUP mode.  VFO A is more sensitive
than VFO B.  Being able to use the joystick-like 4-way control button on the
face of the radio to tune up and down made it easy to make the adjustments
on the receive VFO, without having to use the knob on the top of the radio
(press A/B to switch VFOs, then press down on the joystick button to move
down 5 kHz, then A/B again to get back to VFO B before transmitting - all
done with the thumb that also pressed the PTT on the side of the radio).
Packet in general, as well as looking at the APRS functionality beyond
simply transmitting my location, will be something I take a closer look at
some other time in the near future.

I apologize if I appear to be going into too much detail on what I've done
in setting up the radio before I went on the air with it yesterday.  I'm 
at it as someone who hasn't used Kenwood HTs in at least 15 years until
the past few weeks when I bought a TH-F6A, and no experience with the
TH-D7.  If you know the TH-D7, you'll be able to get running quickly with a
TH-D72.  The manual would still be a useful read for those people, to learn
about the new functionality in the TH-D72.

For those interested in reading the manuals without shelling out cash first,
Kenwood has a good download site for instruction manuals of its ham gear:


Just enter "TH-D72", and you will see two sets of links.  The first set are
for the PDF version of the printed manual supplied with the radio, in
several different languages.  The other links that have "CDROM" in the
description are for the detailed manual that is supplied on a CD with the
radio.  For software used with the radio (virtual COM port driver, along
with the Memory Control Program) along with software for other Kenwood
radios, go to:


I haven't looked on the CD that came with my radio, since I didn't want
to pull out the CD/DVD drive and plug it into my netbook last night.  That
was why I went to these links to download what I might already have on
that CD.  :-)



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