[amsat-bb] TH-D72 questions

Wouter Weggelaar wouterweg at gmail.com
Wed Jan 13 12:52:53 UTC 2016

To add to that, also be aware that the VFO order is important! if you swap
TX and RX, this rig does NOT allow duplex. it is only full duplex when your
TX is on VFO B and RX on VFO A. You can only enable the duplex mode while
on VFO B. This is different to the true full duplex of the TH-D7.

Additionally, the TH-D72 has both narrow and wide FM deviations. be aware
of this. I believe the common practice in satellite operation is still FM
wide (or normal) and *not* narrow.


Wouter PA3WEG

On Wed, Jan 13, 2016 at 5:10 AM, Patrick STODDARD (WD9EWK/VA7EWK) <
amsat-bb at wd9ewk.net> wrote:

> Zach,
> You are correct. You cannot program memory channels on
> a TH-D72 where the transmit and receive frequencies are
> in different bands. You will need to use the lower
> VFO (VFO B) for your transmit/uplink frequency, and the
> upper VFO (VFO A) for your receive/downlink frequency.
> This means you will be switching VFOs when adjusting your
> receive frequency when working SO-50 and LilacSat-2.
> Depending on the pass, you may not need to adjust your
> receive frequency when working AO-85, focusing only on the
> transmit frequency.
> The radio will save the settings like tuning step and PL
> tone, once you set them. These settings are specific to
> each band and VFO. What you have in VFO A does not carry
> over to VFO B, nor do the settings for the 2m band in
> one VFO carry over to the 70cm band (or vice versa).
> These suggestions are in addition to what I e-mailed you
> directly a few days ago.
> In addition to working FM satellites, the packet/APRS part
> of this HT is capable of being used to make packet QSOs
> via the digipeaters on NO-84 and the ISS. I have used APRS
> messages to do this, working only with the HT's keypad.
> It is like typing out SMS messages on a flip-type mobile
> phone, but it is possible. Exchanges are similar to what
> you would do on any other satellite, just done quickly to
> get the information to the other station and so you can
> get the other station's exchange. Using APRS messages means
> you will have copies of what you send to other stations,
> along with messages from other stations back to you, stored
> in the HT.
> Good luck, and 73!
> Patrick WD9EWK/VA7EWK
> http://www.wd9ewk.net/
> Twitter: @WD9EWK
> On Tue, Jan 12, 2016 at 11:26 PM, zach hillerson via AMSAT-BB <
> amsat-bb at amsat.org> wrote:
> > I am a new owner of the TH D72 by Kenwood.  I'm having a bit of
> difficulty
> > with a few default settings and was hoping am ore experienced user could
> > pass on a few tips.
> > My understanding is that I cannot save duplex setups into the memory
> > channels.  I am manually entering the necessary frequencies for AO 85 and
> > SO 50.  Each time I put a new frequency in the radio defaults to a 25khz
> > step and the tone defaults to 88.5 Hz.  I want to have 67Hz and 5khz
> steps
> > as default.
> > There has to be a better way of using the radio for satellites (my only
> > use) then manually entering each frequency and then manually changing
> each
> > default but I haven't found it in the manual yet.
> > Any help for a smoother experience would be appreciated.  I can barely
> > remember to go outside in time for each pass, let alone remember to go
> > through all the keypad functions.
> >
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