[Date Prev][Date Next][Thread Prev][Thread Next] - [Date Index][Thread Index][Author Index]

R: More patch results.



Hi  Frederick

Using the patch as a feed it would be very interesting to know where,in
respect of it,you have placed the geometrical focal point of your
4'  center fed dish.

In other words,where you finded to be for max signal strenght the phase
center of  your patch used as a feed ?

1) Just  at the same level of the patch ?

2) Before the pach ? and if so,how millimeters in front of it ?

Tank you for this information and 73 de

i8CVS Domenico

----- Original Message -----
From: Frederick M. Spinner <fspinner@hotmail.com>
To: <amsat-bb@AMSAT.Org>
Sent: Sunday, September 02, 2001 5:58 AM
Subject: [amsat-bb] More patch results.


> Listened tonight on my BBQ dish with a homebrew passive feed around MA
> 160-190. I don't know if something has gone south in my receive chain with
> the old DEM preamp and converted Drake, but AO-40 wasn't that strong.
> Beacon was about a S-unit and a half above the noise.  SSB was barely
> readable, CW was okay.
>
> Switched to a 3.5 turn Helix on the DH Satellite 4' center fed dish
> Got about a S-unit and a half increase in signal.
>
> Tried the patch I built with the coaxial feed on the "near diagonal" and
got
> another S-unit or so of signal, but to my unscientific ears, the S/N
sounded
> better on the patch more than the one S-unit increase.  I tried the other
> polarazation sense on the patch and the sigs were a S-unit or so down.
>
> S-units were on a FT-847.
>
> This was very unscientific.. I don't know if you've all see the original
> "Mode-S: The book" by K9EK, but I was doing the manual handling of the
dish
> and feed like the "wok" that Ed used in the picture in the beginning of
the
> book.... but with a four foot dish!
> So it was hard to hold everything at the peak of signal strength and tune
> around.  I'll have to build up a mount in my "spare time".
>
> I think the patch works, and a bit better than a helix for a feed.  It's
> much easier to construct and get a good match on.
>
> I was a bit disconcerted about the signals I were receiving. They should
> have been better.  Anyway, for the purposes of testing the patch, the
> relative readings were good.
>
> Fred W0FMS
>
>
> _________________________________________________________________
> Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp
>
> ----
> Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
> To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org
>




----
Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org



AMSAT Top AMSAT Home