In all honesty I haven't been on 2-meter EME for 35 years. Gear was all
homebrew then. That said, I would stick with a 28 MHz i-f. You must consider
image response and where it lands with respect to other services. I once saw an
analysis that promoted a different i-f but I fail to remember what it was or
why. Definitely avoid anything lower.
I would split everything if you are ever to consider a separate HP amp and
mast-mounted preamp. If you are going to worry about frequency stability I
wouldn't bother with the high stability option. You can use an external source
that is much better. I wouldn't necessarily opt for a GPSDO without knowing its
phase noise performance, however. I put together a surplus (ebay) Morion OCXO
that I've had running for about six months and it has been within 3 milliHz of
10 MHz for several months.
I would suggest the low drive power input. You can always attenuate this. PTT
low to TX would be my choice.
Wes N7WS
On 6/2/2021 6:32 AM, W8JH wrote:
I am looking to add the DEMI (Q5) transverter to my K3s and have no
experience with transverters other than the internal one in my KX3. In the
future, I may wish to progress to 2m EME as well.
Here are some choices I need to make and I would appreciate any advice:
Common IF vs Split IF. I'm thinking split IF with a K3s?
Common RF or Split RF. Common RF for one antenna connection?
IF drive level of -20 to 0dBm vs 0dBm to +20dBm. I think the K3s
transverter output is 0dBm so I'm not sure what to think here.
PTT polarity low instead of high I'm thinking.
High stability Local Oscillator vs. standard.
I could get a custom IF and I think there is some slight advantage to a
14mHz custom but I'm guessing the 28mHz standard IF is good enough?
Thanks in advance for any advice or references.
-----
73,
Joe, W8JH
K3s, KPA 500, KAT 500 and KX3 happy user.
--
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