[Moon] Best IF for 23 cm transverter

[Ton PA0TBR]

Thank you all, many interesting comments. I still have some questions...

Don: The reason for a first IF frequency of less than 55 MHz is that I like
to use my ANAN 100D SDR and I have no modern 2m rig in my shack. The ANAN
is very stable and can be GPS locked.
But that doesn't rule out an IF of 144 MHz, I could add a transverter for
that.

Don, Dorn: Kuhne does indeed specify that a filter is required for the
lower cost MKU 13 G3 28, but it does not mention this for the more
expensive TR 1296 H-28 S. Maybe they forgot or have sufficient filters in
their TR 1296? I should have mentioned this, sorry.

Dick: I assume that you must be using the TR 1296, correct? Is that mounted
inside or outside the shack? Do you have more info about any filters it has?

Zdenek: You mention that a cavity filter is always required, also with an
IF of 144 MHz?  Both on the input to the final amplifier and after the LNA?

John: The Anglian transverter looks like a good choice if going for an IF
of 144 MHz. I think that I would need a small amp on the 144 output and my
Leo Bodnar GPS clock could be used to lock the crystal frequency.

Rainer: Making or getting filters is not the problem. I am considering the
different options. Maybe the (lack of) price for the Kuhne filter is the
problem? hi

Hans: that is how I learned it some 50 odd years ago and why it triggered
my question about filters. I am not sure if that holds true with modern
mixers and interdigital filters and I wonder if the double conversion does
not create it's own set of problems.
Modification of a (Kuhne) transverter to an IF of 50 MHz is maybe not a bad
idea, but is more risk than building filters.

Dorn: You mention that you use transverters for several higher frequencies
with an Anglian 144 MHz transverter. That might be a good argument to go
for an IF of 144 MHz, should I want to go to 13 cm or so later on.

73,
Ton pa0tbr