[NLRS] DEM 10g Amp question...

[Donn Baker]

Hi Bruce,
No reason you couldn't put a small voltage divider on the aux output (or
input to the amp) to reduce the 24/12 to, say 12/6 volts.  A small
capacitor, maybe .1uf would also serve to dampen the 24v spike.  And yes, I
suspect the "sequencing" you'll get will help keep your SMA relay from
cooking as it will no longer hot switch.

I've been told the amps want 13.8 VDC, and fall off fairly rapidly at lower
Vcc.  It might be worth a DC-DC converter to provide 13.8 at the terminals
from anything between 10 and 12.6 volts.  I suspect the amp wants <1 amp
@13.8, so its an easy load.

I got notification the sequerncer boards have arrived at Paul's, and will
be shipped shortly.  We need to talk to see what I need to order for parts
for your boards and mine.

See you tomorrow, I hope.

73 Donn
WA2VOI/0

At 20:13 31-05-03 -0500, you wrote:
>My 10Gig 2w amp arrived and I am starting to work on integrating it into my
>system.
>
>It came wired for "ground to transmit" however, I can see the pad that I
>would move the PTT line to if I were to supply a "pos voltage for transmit".
>
>As it is, I can easily parallel/pig-tail the "ground to transmit" that I
>have coming out of my IF rig and key both the xverter and the amp with this
>action.
>
>However, wouldn't it be smarter and actually have some sequencing effect if
>I were to use the AUX-out of the xverter which is "24v" spiked declining to
>12v all on transmit?  Would the 24-12 be too much voltage for the PTT
>circuit in the amp?  I would think that the PTT circuit in the amp wouldn't
>sink too much current.
>
>I do have some Paul Wade sequencer boards coming but didn't actually
>anticipate using them in the 10G set-up.
>
>I know K0SHF grounds both of his units at the same time for keying and so
>far has had no problems.
>
>Thoughts?  I may call Steve at DEM, but I thought I'd ask my local friends
>first :-) .
>
>Bruce Richardson - W9FZ
>
>Hup Hup. In the Big Sky -- Kate Bush
>
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