[amsat-bb] Re: One questiong for ant hombrewers...

Art McBride kc6uqh at cox.net
Tue Jul 24 21:41:07 PDT 2012


Pavel,
 You may want to consider a one wavelength one turn QFH. Its best gain is
below 30 degrees above the horizon. The pattern is still omni. 

Art,
KC6UQH

-----Original Message-----
From: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org] On
Behalf Of Pável Milanés Costa co7wt
Sent: Monday, July 23, 2012 5:14 AM
To: amsat-bb at amsat.org
Subject: [amsat-bb] One questiong for ant hombrewers...

Hi to all.

I'm Pavel Milanes, CO7WT, from Cuba, member of the GROS.

I have a question in my head and I have not enough arguments to decide, I
have to BUILD my own antennas, so having this into account:

What is the most cost effective (cost / gain / difficult in building / omni
pattern) that can I build?

I have in plans to build a LNA from a servian pdf using the BF998 MOSFET,
that will be at the antenna point, Andrew Heliax LDF-4 50 ohms for the
download to the shack and of course this is a FIXED antenna, with NO rotors.

I have heard of and modeled all this ones and all have his pros and cons...
- QFH
- Turnstile dipoles
- Turnstile moxons (100 ohms)
- Eggbeater

I think (correct me if I'm wrong) that the best election will be the QFH,
because his really omni pattern, beside the fact that I will have to build
two of them (rhcp and lhcp switched properly with a relay) and the lower
gain will be 'compensated' with the LNA...

Please, I don't want to start a flag war, only heard about some experiences
to decide my self.

Last tip, TRX on 70 cm will be a Kenwood channelized TK-382N for FM (5W) and
TRX on 2m will be a Alinco DR-130.

73



Este mensaje ha sido enviado mediante el servicio de correo electronico que
ofrece la Federacion de Radioaficionados de Cuba a sus miembros para
respaldar el cumplimiento de los objetivos de la organizacion y su politica
informativa. La persona que envia este correo asume el compromiso de usar el
servicio a tales fines y cumplir con las regulaciones establecidas.
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