[amsat-bb] Re: Station not coming together - the full post (sorry for repost, reply to this)
wa4ivm at amsat.org
Wed Mar 7 16:59:03 PST 2007
Google on Jerry's "Texas Potato Masher II". His changes to the original
are worth the effort. I built one each and worked AO51 with them using
5 watts and an HT. Progressed to M2 beams and UHF preamp and retired
the IIs for possible field day use. They are easy to make with PVC and
#12 house wire. A length of 12/2 with ground or 12/3 will get you the
wire if the junk box is empty.
Edward Cole wrote:
>At 09:07 PM 3/6/2007, Edward Cole wrote:
>>My impression of Hamtronics equipment --snip
>Sorry should have written Matt. Also Ramsey instead of Hamtronics,
>though they are about the same in performance.
>Matt, try running your preamp at the antenna as the first step and
>see if you improve your reception. I would also move the antenna
>away from the other antenna.
>Then if still not good enough reception try a 2m whip. If the whip
>works better then you know you have a problem with the
>eggbeater. Does the eggbeater have a ground plane under it? If so
>this would favor overhead reception vs. on the horizon. The
>eggbeater is circular polarized for over head directions; did you
>make it right-hand or left-hand circular polarization? The simple
>whip or small yagi actually work better since polarity on LEO sats
>seem to shift a lot.
>For much better results you might tilt your eggbeater down to
>20-degrees and mount a light TV rotator to swing it in azimuth. In
>this position you should have the ground-plane radials to make the
>antenna directional. I belive that is what Jerry, K5OE, ended up
>doing to maximize his use of this antenna. Using an Arrow antenna
>mounted this way has worked very nicely for many LEO operators.
>Ed - KL7UW
> BP40IQ 50-MHz - 10-GHz www.kl7uw.com
>144-EME: FT-847, mgf-1801, 4x-xpol-20, 185w
>DUBUS Magazine USA Rep dubususa at hotmail.com
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