Gray Tenn. Hamfest sellout
Hello all, I really HATE to do this but unless something drastic happens this week (IE...hitting the lottery) I am going to sell out of ham radio and electronics in general. I have been collecting satellite gear for the past few years and have not even used most of it. Alot of the items are brand new. ARR Preamps, M2 CP VHF and UHF antenna's, (the BIG one's) Rohn 45 tower parts, ect... The radio's are.. Kenwood TS-790A with 1.2Ghz and IF-232 computer module Yaesu FT-847 Both radio's are in excellent condition (8-9 out of a 10) I also have 3 service monitors and assorted test gear that I will be selling. 2 ea IFR 1000S and 1ea. Cushman CE-50TG I will be attending the Gray Tennessee hamfest, located in northeast Tennessee on the 18th of October. If your wanting to build up a topnotch satellite, or VHF/UHF station, Please come by and visit my table. I don't have a list compiled yet but it will be quite a lot. Thanks and 73's RoD KD0XX
hi
Any body know ?, in where i can buy Turnsytle antena for LEO Sat ? and cheap. I have some project testing Prototype LEO Sat.
73 de YF0EEE
Dirgantara R - YFØEEE wrote:
hi
Any body know ?, in where i can buy Turnsytle antena for LEO Sat ? and cheap. I have some project testing Prototype LEO Sat.
73 de YF0EEE
Turnstile antennas are actually pretty easy to make. At its simplest, it's four bits of wire about 1/4 wavelength long, with a 1/4 wavelength phasing loop joining them. Note that the lengths of the elements and the phasing loop are going to be actually 1/4 wavelength multiplied by the velocity factor, which for the elements will be so near unity it's not worth bothering with (make them a tiny bit shorter *if* you need to), and for the phasing loop will be dependant on the cable used - 0.66 for RG58.
You haven't said which frequency range you want the antenna for, but on UHF I've had excellent results with the K5OE antenna, and I've also had a lot of success with the "cheap yagi" designs by WA5VJB. The latter I found a bit "narrow" to tune, though.
Gordon
hi Gordon
if I use home brew it is possible in space ?, Sun solar hardener it possible damage the antenna any solution ? Factory build ? if possible already tested in hardener and for Space use.
btw want to use in VHF and UHF
thanks
de YF0EEE
----- Original Message ----- From: "Gordon JC Pearce MM3YEQ" gordonjcp@gjcp.net To: "AMSAT-BB" amsat-bb@amsat.org Sent: Tuesday, October 14, 2008 2:44 PM Subject: [amsat-bb] Re: Turnstyle antena
Dirgantara R - YFØEEE wrote:
hi
Any body know ?, in where i can buy Turnsytle antena for LEO Sat ? and cheap. I have some project testing Prototype LEO Sat.
73 de YF0EEE
Turnstile antennas are actually pretty easy to make. At its simplest, it's four bits of wire about 1/4 wavelength long, with a 1/4 wavelength phasing loop joining them. Note that the lengths of the elements and the phasing loop are going to be actually 1/4 wavelength multiplied by the velocity factor, which for the elements will be so near unity it's not worth bothering with (make them a tiny bit shorter *if* you need to), and for the phasing loop will be dependant on the cable used - 0.66 for RG58.
You haven't said which frequency range you want the antenna for, but on UHF I've had excellent results with the K5OE antenna, and I've also had a lot of success with the "cheap yagi" designs by WA5VJB. The latter I found a bit "narrow" to tune, though.
Gordon _______________________________________________ Sent via AMSAT-BB@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
participants (4)
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Dirgantara R - YFØEEE -
Dirgantara YF0EEE -
Gordon JC Pearce MM3YEQ -
R. Chastain