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

Lizeth Norman normanlizeth at gmail.com
Tue Jul 24 00:25:54 PDT 2012


Hi!
The building of the qfa is a problem. Following the plans on the net
yeilded an antenna that was resonant low in frequency. The good news
is the material is easy to get and cheep. Have not had the chance to
build a third one and find out if I can get it optimized. The 435 MHz
version was less than 2.5:1 Should be lower, though.
OTOH, I did build two (lhcp and rhcp), and switched them. The
performance was fairly good.
Keep me in the loop.
73 es have fun,
norm n3ykf


On Mon, Jul 23, 2012 at 7:13 AM, Pável Milanés Costa co7wt
<co7wt at frcuba.co.cu> wrote:
> 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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