Topband: RX Antenna for DXepedition
steve d
kc8qvo at yahoo.com
Tue Aug 21 14:00:54 EDT 2007
George AA7JV wrote:
The big question I am facing is whether I should take a separate RX antenna, such as a K9AY loop, or wire for beverages? Given the location, I do not expect much man-made noise. On the other hand, I expect QRN from thunder-storms to the north. Will the noise on the TX antenna be too high? Would a dedicated RX antenna be worth the extra weight and work required to erect it?
Response:
Hi there George. Consitering your location, I think you will be OK using your inverted L as an RX antenna. You aren't going to get top-notch performence, but at the same time you are only a two-man crew and the less the effort you put in to set up the better your vaccation will go (trust me, I know - Ive done 1 man operations while on vaccation on 6, 2, 432 the past several years). Your location will probably be pretty quiet. so band noise wont be much of an issue (maybe a few crashes from storms, like you say, but that shouldn't make the band unusable). Your signals will be weaker, but the low noise would compensate. If you are DX it doesnt take a big station to make contacts - everyone is looking for ya.
A K9AY loop system, if you do opt for an RX, is going to be your best bet. Beverages take up a lot of space and are a pain to set up. Same goes for the EWE, and other flags (minus the K9AY - single support, 2 wires for 4 directions). You could also go with BOG's (beverage-on-the-ground), I think they are also called Snake antennas. They dont perform as well as a beverage does but if you get out a significant amount of wire it will only help.
I think youll be fine on the L, but its up to you. If you had more pairs of arms then you could put together a top-notch station, but with just the two of you and ham radio not being your main focus then it isnt worth it to put any more in to your station than what will get you on the band. If you are a perfectionist, go for whatever you want! Thats my 2c HI
You say you are going to run on 80 and 160? If just those two bands then make your L for 80 and switch in a loading coil for 160. That way you can achieve resonance at the antenna and the size is a bit smaller. That is, unless your tuner is mounted at the antenna.
Set up a doublet for the VHF bands too (40-10) HI.
Steve, KC8QVO
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