[Moon] [Moon-Net] 1296 EME

Ingolf, SM6FHZ ingolf.fhz at gmail.com
Tue Dec 22 22:56:02 CET 2015


Steve and all,

there is actually a 13 cm version of my circularly polarized patch feed as
well. You will find it at my Web-site. The below presentation gives the
important dimensions as well as simulated and measured performance of this
feed.

http://www.2ingandlin.se/Circularly%20Polarized%2013%20cm%20Patch%20Feed.pdf

However, on 13 cm the advantage in size compared to a WG-feed might not be
as clear as on lower bands. The efficiency is lower than for a well
designed Kumar type WG-feed. Still it might be easier to build with
hand-tools than a WG-feed.

Enjoy it as an early X-mas gift for the EME fraternity!

Seasons Greetings to all and the best wishes for the coming New Year 2016.

73 / Ingolf, SM6FHZ


2015-12-20 16:27 GMT+01:00 Steve Gross <n4pz at live.com>:

> Hi John
> Thanks for the info. I am interested in Ingolf's feed.
> I have a VE4MA feed on 1296 and it's super but tweaking it is not easy for
> me.
> I never heard about ingolf's feed.
> Great on your CW QSOs. I started with a 10 foot dish and gave up. My 16
> foot dish is light years ahead of the 10 footer.
> Thanks to K5JL I have a TH327 amp originally built by DL9EBL which makes
> 1500 watts on 1296.
> That of course does wonders on transmit. I spent serious money on the
> system but who cares. It's my passion in life now that I'm getting too old
> to chase girls with any success.
> I have a compromise feed on 2304 but it works. Sort of. Hi Hi
> I will be on today on 1296 if you are interested John.
> Merry Christmas my British friend.
> 73Steve N4PZ
>
>
> -----Original Message-----
> From: Moon [mailto:moon-bounces at moonbounce.info] On Behalf Of g4bao
> Sent: Sunday, December 20, 2015 8:30 AM
> To: Moon-Bounces
> Cc: Dave Sublette; moon-net
> Subject: Re: [Moon] [Moon-Net] 1296 EME
>
> Yep I'm up to 49 1296 initials with that feed system and a 1.9m and 170
> Watts.
>
> 9 of those 49 are CW initials and I've got "challenged" hearing when it
> comes to EME CW so it could have been (and will be) more! I regularly get
> better reports than slightly bigger dishes with full size Septum feeds
>
> Ingolf's feed really works well and needs no tweaking if you follow his
> build instructions.  Cost me about £20 for metal and a cheap 1 to 2 GHz
> stripline hybrid from EBay
>
> 73 and happy Christmas
>
> John G4BAO
>
>
>
> On Dec 20, 2015 10:30 AM, "Peter Blair" <g3ltf at btinternet.com> wrote:
>
> > And as an endosement to the quality and performance of this feed in
> > small,  ~2m, dishes I have worked both the stations mentioned on fully
> > random CW, no side channel, no logger.
> > 73 Peter G3LTF
> >
> > From: Ingolf, SM6FHZ
> > Sent: Sunday, December 20, 2015 10:05 AM
> > To: Dave Sublette
> > Cc: Moon-Bounces ; moon-net
> > Subject: Re: [Moon-Net] 1296 EME
> >
> > Dave and all.
> >
> > For a small dish at 1296 MHz (~<2.5 to 3m) a conventional feed horn
> > can be somewhat bulky and cause some blockage, this feed might be an
> > effective
> > alternative:
> >
> >
> > http://www.2ingandlin.se/Circularly%20polarized%20patch%20feed%20for%2
> > 01296%20MHz_A.pdf
> >
> >
> > G4BAO, John and SM6PGP, Hannes are both successfully using it with ~2m
> > dishes. They use slightly different schemes to generate circular
> > polarization. Hannes is using the scheme shown in the link whereas
> > John is using a branch line coupler (3 dB hybrid) directly as
> > described in RadCom in October and November 2015. Both ways have pros
> and cons.
> >
> > It should also be noted that a small dish (<10 to 15 lambda) with a
> > large f/D (~>0.4) is difficult to feed in the low noise way as Paul
> describes.
> > This is due to the feed size needed to get a narrow enough beam to get
> > a quiet dish system. Avoid small dishes with f/D >0.4 if you would
> > like to get a low noise receive system.
> >
> > There is, as Paul says, a lot to gain from carefully choosing a feed
> > that suites your dish and ambitions.
> >
> > 73 / Ingolf, SM6FHZ <http://lists.moonbounce.info/listinfo/moon>
> >
> _______________________________________________
> Moon mailing list
> Moon at moonbounce.info
> http://lists.moonbounce.info/listinfo/moon
> _______________________________________________
> Moon mailing list
> Moon at moonbounce.info
> http://lists.moonbounce.info/listinfo/moon
>



-- 
Ingolf, SM6FHZ
http://www.2ingandlin.se/SM6FHZ.htm


More information about the Moon mailing list