Hi Greg et al
I have been partial with the helix for satellites. I run 10W to a 16 turn helix through 40 feet of LMR-400. I rarely have an issue getting into AO-51. I believe AO -51 is our only L band bird, I try to "exercise" my gear when the opportunity is there. I experience very little fading with the L band uplink, input to the satellite is quite solid down to fairly low elevations. The yagi would as you mentioned would better for terrestial 1.2ghz stuff. 73 Bob W7LRD ----- Original Message ----- From: "Greg D." <ko6th_g...@hotmail.com> To: amsat-bb@amsat.org Sent: Tuesday, September 21, 2010 10:03:31 PM Subject: [amsat-bb] Antenna Opinions? Hi folks, So, we had a swap meet a couple of weekends ago, and I found a bargain I couldn't refuse. Of course, now I need to decide what to do with it... The Find was a 35 element 1296mHz antenna, well built and in excellent condition. Linearly polarized, horizontal; supposed to be 23dBi gain. Manufacturer, of course, is unknown. No markings, but it does not look home-built. By the mounting hardware, it looks like it was part of some sort of stacked array. The problem is that I already have a 1296mHz antenna. Home-made, circularly polarized, 18 turns Helix. Should be something like 17dBic, if the calculations are correct. In the shack, which is at the wrong end of 60' of 1/2" hardline and a total of about 15' of RG-213 or something like it, I have my Yaesu 736R and its 10 watts of screaming RF power. No preamps. Which antenna should I keep up on the rotor assembly? Last weekend I put up the new antenna. I've made one AO-51 LU pass with the new antenna, and I was not impressed. Several times I couldn't get into the bird, presumably because of the crossed polarization. But when I did get in, it was full quieting, even at low elevations. I don't recall having this much trouble with the Helix. I think AO-51 is the only current satellite on L-band, right? For other uses, there's nothing terrestrial to aim at, repeaters-wise; they're all hiding behind one or more hills, or went off the air years ago. That leaves Weak Signal work (hence the horizontal mounting). I do have one shot into the valley, to the North West, but probably slim pickings for contacts. I haven't tried EME. I'm leaning towards putting the Helix back up, and passing the new one on to someone more able to use it. What are your thoughts? Thanks, Greg KO6TH _______________________________________________ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb _______________________________________________ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
