Re: [amsat-bb] TranSystem MMDS converter for AO-40

[K5OE@xxxxxxx]

Ward,
Very good.  Your measurements are consistant with K5GNA's.  He has hundreds of these puppies.  I was over at Bob's house the other day and picked one up to test out, as well as several of the wire-frame dishes he has.  I was especially interested in the 24"x19" model, as it looks like a good candidate for 5 & 10 GHz with some aluminum screen added.  I also needed more gain for the local HATS ATV repeater (which is harder to hear/see than AO-40!).  I have been picking that up with my Drake, but the signal is usually only P4.

I went out this morning at 1850 utc to try and pick up AO-40, but could not find the beacon.  I am sorry I could not report a more positive assesment.  I don't know whether it was the hardware or some kind of cockpit error.  I suspect the latter because I could not find it with my Drake and helix either :-)
73,
Jerry, K5OE


In a message dated Sun, 11 Mar 2001  2:23:54 PM Eastern Standard Time, "wc0y" <wc0y@email.msn.com> writes:

<< I did some measurements on a TranSystem AIDC-3733 MMDS converter that I
recently bought through an eBay auction (more may still be available).  This
converter is similar in function to the Drake 2880.  Measurements of an
unmodified TranSystem converter and a fully modified Drake are on my website
at http://communities.msn.com/wc0y

The unmodified TranSystem converter performance was impressive.  I will
convert this one for a 145 MHz IF, but early indications are that it will
give excellent performance with no other modifications than changing the
crystal and tweaking frequency.

Some measurements are:

125 MHz IF/ 2401 MHz RF - 36.7 dB gain, 1.2 dB noise figure

145 MHz IF/ 2421 MHz RF - 36.8 dB gain, 1.3 dB noise figure

More measurement results and a photo of it are at my web site.

73,
Ward - WC0Y

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