A Cheap Indoor Dipole for 80m-15m
I finally got my hands on an HF transceiver last week. It’s a gently used IC-735, with CW, SSB, AM, and FM on all bands 160-10 meters with the exception of 60 meters. It has had the MARS modification done on it, so it will transmit on any frequency between 100 kHz to 30 MHz. It has a max power output of 100 watts in CW, SSB, and FM modes, and 40 watts in AM. A handy rig to have for a ham who’s just starting out. It’s certainly not as spiffy as the brand new DSP rigs with huge LCD displays and power computers under the hood, but there are more than enough features to satisfy the beginning to intermediate operator. Since I got the rig on the air on March 10th, I’ve had six contacts with my straight key, each in a different state, so I only need 44 more states to get WAS!
But I’m getting ahead of myself. The fanciest, most expensive rig on the planet isn’t worth a hill of beans without an antenna to send and receive signals. I’ve avoided HF for a long time because I assumed the antenna requirements would be too costly in terms of space and money. I live in a townhouse with no attic, no basement, and a postage stamp yard, and putting up antennas outside is entirely out of the question. There simply isn’t enough space to string up a full sized dipole indoors for most of the HF bands. I had the inspiration, however, to try setting up an antenna for 20 meters, which is a popular HF band and should also resonate on 10 meters if designed carefully.
Pete Curry 2:08 pm on January 5, 2013 Permalink |
Hi: I’d like to try this. Does it matter if the base leg is a bit shorter as long as the total length is the same? Thanks, Pete Curry, KA2TTU
Josh B 5:18 pm on January 5, 2013 Permalink |
Hi Pete,
As far as I can tell the only difference a shorter base leg might make is in making it a bit more directional. As it is setup at my house it’s already much more sensitive along an axis perpendicular to the base leg and in the opposite direction of the two side legs. So for instance the opening of the “C” shape points south and I get much more reception from the north than from any other direction, but I have still made contacts in all other directions as far as 1,000 miles or so. If you get your put up please send me some pictures and let me know how it works!
–73 de Josh NC4JB
Pete Curry 10:49 pm on January 5, 2013 Permalink |
Thanks, Josh. I’ll let you know how I make out, Pete
Pete Curry 9:15 am on January 6, 2013 Permalink |
Hi Again: In your headline you talk about 80m to 15m coverage with this antenna–with “m“ I assume meaning meters. But in the third paragraph you say you can load it up on all bands between “80 and 18 MHz.” If these numbers are both MHz, shouldn’t the first one be something like 3.5 to 4.0? Thanks, Pete/KA2TTU