Posted by
Dave Sublette-2 on
May 19, 2018; 6:12pm
URL: http://elecraft.85.s1.nabble.com/K2-Using-the-K2-above-29-MHz-tp7640947p7640950.html
I have used my K2 with a DEMI 2M transverter board in it to drive
transverters from 902 through 10368 MHz for many years. When I used it to
drive both 902 and 903 MHz portions of that band, the output was very much
lower when 29MHz was in use for 903. I can't say whether it was due to the
29 MHz IF or the 144MHz transverter output. I didn't pay much attention to
spurs as 902/903 is a trashy band anyway. I have made many nice QSOs with
the setup.
73,
Dave, K4TO
On Sat, May 19, 2018 at 1:18 PM Steve Kavanagh via Elecraft <
[hidden email]> wrote:
> The K2 is specified to operate on 10m only up to 28.8 MHz. While
> contemplating possible future VHF rigs for a multi-operator multi-band
> environment, I have wondered about using a K2 as an IF for VHF transverters
> at around 29-29.4 MHz (to avoid interference with bands using 28 MHz IF).
>
> Both of my K2s seem to operate (VFO synthesizer works) up to 30 MHz. At
> 29.5 MHz the available transmit power (QRP) is starting to drop off and
> this is quite noticeable at 30 MHz. The QRP PA efficiency drops off
> somewhat as well. There are a few receive birdies on the 100 watt radio,
> but the QRP one is pretty quiet - nothing that should be noticeable under
> the extra noise coming from a transverter. Turning the preamp on makes
> extra noise as it should (but it is after the bandpass filters so that
> doesn't mean a whole lot). But it seems that it should work ok as long as
> I don't want more than 4-5 watts (most likely I'd use a K60XV), perhaps
> with a bit of bandpass filter tweaking.
>
> Are there any caveats that I am unaware of? Spurious emissions, perhaps?
> Has anyone tried using their K2 above 29 MHz?
>
> 73,
> Steve VE3SMA
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