RE: [amsat-bb] AO40 modes

["laura halliday" <marsgal42@xxxxxxxxxxx>]

Tony Langdon <tlangdon@atctraining.com.au> wrote:

>(snip...)
>U/S and V/S are good combinations form those with
>commercially built rigs and the cheap MMDS converters.
>I'm likely to try U/S first, while building my L band
>uplink...

I'd expect lots of activity on U/S, because it's the same
bands as AO-13 Mode S.

>Will have to look at converters for 450 -> 28 MHz so I
>can use SSB on 2400 MHz, can go as low as 25-26 MHz and
>it'll work with all of my receivers, which gives terres-
>trial reception on 2403 as well.
>
>Anyone know of a reasonable 70cm - 10m converter design?
>It would need to be reasonably cheap, use readily available
>(in VK) parts. Noise figure need not be too flash, and
>conversion gain need not be too high, as the converter
>will be operating after the 2.4 GHz converter...

How is the availability of Mini-Circuits stuff? Ed Krome
(now K9EK, then KA9LNV) published a nice transverter in
QST a while back. It is based heavily on Mini-Circuits
components, and it works well.

I recently built a Hamtronics 70cm -> 10m receive converter.
It's a warmed-over 1970s design with dual-gate MOSFETs as
RF amplifiers and mixers. The same one that was written
up in the AMSAT Jurnal. It works fine so far...

What are the requirements for importing electronics into
VK-land? Us VE-types can import any electronics we want,
duty-free, as long as we pay the federal and provincial
sales tax on it.

Very little is readily available in Canada. We have to
import just about everything.

>Will probably have to get a crystal cut specifically for
>this job (due to the odd frequency offset), so will need
>crystal specs for the design as well for ordering purposes.

Ed's converter uses a 5th overtone crystal in the 101 MHz
region, multiplied by 4. The Hamtronics converter comes
with a crystal.

Laura Halliday VE7LDH     "Que les nuages soient notre
Grid: CN89mg                     pied a terre..."
ICBM: 49 15.042 N 122 59.053 W       - Hospital/Shafte
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