23cm antennas to work repeaters

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M0DHP
Posts: 31
Joined: Sun Sep 24, 2017 3:25 pm
Location: Thames Ditton IO91TJ

23cm antennas to work repeaters

Postby M0DHP » Tue Nov 07, 2017 10:16 am

Beginner's question about working 23cm DATV repeaters (e.g. GB3SQ, GB3PV, GB3ZZ) with a setup like this ... viewtopic.php?p=13811#p13811

With the repeater input on 1249MHz and the output as high as 1316MHz, is it feasible to use just one antenna switched between TX and RX? Or are two antennas needed, tuned to the different frequencies?

Or do people usually work crossband - 70cm in, 23cm out?

Many thanks and 73
Ray M0DHP

g8vpg
Posts: 154
Joined: Fri Oct 11, 2013 9:35 am
Location: Bristol

Re: 23cm antennas to work repeaters

Postby g8vpg » Tue Nov 07, 2017 10:51 am

Ray,
The perfect aerial for 23cm repeater working was the old G3JVL quad-loop, which had three driven elements on a log periodic feed and covered the frequency split well. The design is around if you want to have a go at making one.
I am currently using the smallest Wimo beam;
http://www.wimo.de/yagi-antennas-shf-wi ... ml#shf2328
This covers 1249/1316 quite well and is a very well made aerial that has been up for over 15 years and is still working well. Ordering direct from Wimo in Germany is no problem and orders arrive within a week.
73 Shaun G8VPG.

M0DHP
Posts: 31
Joined: Sun Sep 24, 2017 3:25 pm
Location: Thames Ditton IO91TJ

Re: 23cm antennas to work repeaters

Postby M0DHP » Tue Nov 07, 2017 12:56 pm

Thanks for the info, Shaun. I'll take a look at those suggestions.

73
Ray


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