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Nick WB4SQI wrote:

Can you be a bit more specific on your PM hikes?

Yes, Nick... I usually operate for 2 or 3 hours at a time with a
normal QSO style. Overall, maybe 85% receive/standby and 15% transmit.
Maybe a little higher % transmit when there is good propagation or I'm
calling for a sked or ragchewing.

I was thinking along the lines of 7ah

That should be fine for /PM. 7Ah gel cells are the most popular
portable pack size for hams (mostly due to low cost).
There is an interesting survey of portable operators on this subject:


For casual /PM, gel cells are fine, but for backcountry packing,
you'll want Li Ion, NiMH, or better yet Lithium primary cells.

I think the best combination for "Transceiver + Amplifier" /PM
operation is with a separate battery feeding the amplifier. That way,
the transceiver can be maintained at good voltage stability. Then, you
are free to let the amplifier run down its battery and still maintain
your barefoot capability. This sort of setup is easily arranged with
the FT-817 and its isolated internal pack.

Bonnie KQ6XA

KQ6XA wrote:

I think the best combination for "Transceiver + Amplifier" /PM
operation is with a separate battery feeding the amplifier. That way,
the transceiver can be maintained at good voltage stability. Then, you

are free to let the amplifier run down its battery and still maintain
your barefoot capability.

I have found (the hard way) I need a separate power source for the
SGC237 Porta tuner. Running the SGC2020 and 237 from the same source
leads to problems when voltage dips on voice peaks. (From a 7 amp
Pyramid PS). When this occurs, the 237 loses tune and relays start
clattering. I figure a 7ah cell for the 237 and small, maybe 1.2ah for
the tuner would be realistic.

Thanks for the info also Bonnie. CU on HFpack.....

73

Nick
WB4SQI

--- In FT817@y..., Nick Marsh <nmar@e...> wrote:

...I figure a 7ah cell for the 237 and small, maybe 1.2ah for
the tuner would be realistic.

For /PP I've been using a 7ah cell on the DX-70TH with a 2.3ah cell
on the AT-11. (Haven't been /PM with it yet, but this week. Kind of
heavy for trail work, but maybe the xcvr cell will give out before I
do :-/)

Also the same 2.3ah cell on the FT-817 with 8 alkalines on the Z-11.

Good combinations both.

Frank
AB2KT

OE3MZC:
The reason for the SG237 Smartuner to start the tuning process again
might also be an old software in the EPROM of the 237! You can write
to SGC and ask for a new version that makes the tuner more stable or
you can use the SMARTLOCK feature.
Also see :



--- In FT817@y..., Nick Marsh <nmar@e...> wrote:

KQ6XA wrote:

I think the best combination for "Transceiver + Amplifier" /PM
operation is with a separate battery feeding the amplifier. That

way,

the transceiver can be maintained at good voltage stability.

Then, you

are free to let the amplifier run down its battery and still

maintain

your barefoot capability.

I have found (the hard way) I need a separate power source for the
SGC237 Porta tuner. Running the SGC2020 and 237 from the same source
leads to problems when voltage dips on voice peaks. (From a 7 amp
Pyramid PS). When this occurs, the 237 loses tune and relays start
clattering. I figure a 7ah cell for the 237 and small, maybe 1.2ah

for

the tuner would be realistic.

Thanks for the info also Bonnie. CU on HFpack.....

73

Nick
WB4SQI