Hi Dave,
your antenna is somehow surprising to me.
If you do not want to have a large band of frequencies, you can adapt the
two loops of this QFH (in the band of doppler effect naturally), at the same
GPS frequency; if think this will improve the gain.
I do not see how do you realised the isolation of the hot point of the
loops. All seems to me made of copper...
Alain
F4GBC
i apologies for my bad english.
-----Message d'origine-----
From: quartz55
Sent: Wednesday, November 20, 2013 11:34 PM
To: [email protected]
Subject: [time-nuts] DIY antenna
Haven't seen this posted in the past, but I haven't seen everything.
Anyhow, it appears to work as good signal strength wise as the PCTEL antenna
I got with this Nortel unit. Of course it needs to be installed in some PVC
or similar. The chip was only about $3 from mouser (MAALSS0042-38878), I've
got maybe 5 more and I made the board by trimming a single sided board with
exacto knife. I'm going to try another and get the elements more precise,
these are somewhat not round and of not equal lengths, plus I'm going to run
some coax through a piece of brass tubing as an infinite balun, but I'm not
expecting to see any or much improvement. This one is made from semi rigid
line, thanks Jim. It was easy enough to do, just very detailed soldering
and my soldering tools are really not small enough to work on these surface
mount devices. So far I've only used it sitting on the deck railing which
is not a great location, but then I don't have any great locations for GPS
antennas.
This is after I re-worked it, originally it didn't work very good, I think
some of my solder joints weren't good, it's so hard to see. I have to use
one of those headband things with all the mag to see the details and it's
impossible to solder on it with the headband mag. I use a large magnifier
with the round fluorescent tube around it.
http://i251.photobucket.com/albums/gg287/DogTi/time/diyant_zps7849aa73.jpg
Dave
N3DT
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