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New BITX-40 User and Antenna Recommendations

Faisal Akber (VA3SFA) All Messages By This Member #28087 Hi Everyone, I ordered a BITX-40 a short while ago (A3-720). I've finally wired it together and got it working!! Once I have a decent small antenna I'll get on the air. I live in an apartment and won't be able to put up dipoles or large verticals. I am looking at two different options: 1 - A short (2m) vertical with a loading coil. 2 - A small magnetic loop. Have you tried the BITX-40 with any of these two types of antennae? What are your experiences and recommendations? Thanks and 73, VA3SFA/W6
Thomas Noel #28090 开云体育 Both will work, and both will have similar challenges as you can’t fool Mother Nature. The (extremely) short loaded vertical will have low efficiency and narrow bandwidth, and will require a tuner. The magnetic loop will also have extremely narrow bandwidth and require adjustment with even slight frequency changes. Google K2MIJ and his extremely small antennas for HF, such as the 9” tall “Limbo Stick” Another idea is the spiral loop. Thomas W Noel KF7RSF toggle quoted message Show quoted text On Jun 11, 2017, at 11:15 AM, Syed Faisal Akber <faisal@...> wrote: Hi Everyone, I ordered a BITX-40 a short while ago (A3-720). ?I've finally wired it together and got it working!! Once I have a decent small antenna I'll get on the air. ?I live in an apartment and won't be able to put up dipoles or large verticals. I am looking at two different options: 1 - A short (2m) vertical with a loading coil. 2 - A small magnetic loop. Have you tried the BITX-40 with any of these two types of antennae? What are your experiences and recommendations? Thanks and 73, VA3SFA/W6
Daniel Norris All Messages By This Member #28108 A really cheap and simple option worth trying is an indoor dipole. ? Check out this page, , and omit the 20m radials since you're only using it for the bitx40.? I have something similar installed in my house... although I haven't used it much (I spend too much time doing homework right now... not enough playing with radios), I was able to hear stuff on it when I first set it up. ? You'd need some kind of swr meter to trim it to the correct length, but that's it. ?? --Dan KK6WCG toggle quoted message Show quoted text On Sun, Jun 11, 2017 at 11:33 AM Thomas Noel <tnoel@...> wrote: Both will work, and both will have similar challenges as you can’t fool Mother Nature. The (extremely) short loaded vertical will have low efficiency and narrow bandwidth, and will require a tuner. The magnetic loop will also have extremely narrow bandwidth and require adjustment with even slight frequency changes. Google K2MIJ and his extremely small antennas for HF, such as the 9” tall “Limbo Stick” Another idea is the spiral loop. Thomas W Noel KF7RSF On Jun 11, 2017, at 11:15 AM, Syed Faisal Akber <faisal@...> wrote: Hi Everyone, I ordered a BITX-40 a short while ago (A3-720).? I've finally wired it together and got it working!! Once I have a decent small antenna I'll get on the air.? I live in an apartment and won't be able to put up dipoles or large verticals. I am looking at two different options: 1 - A short (2m) vertical with a loading coil. 2 - A small magnetic loop. Have you tried the BITX-40 with any of these two types of antennae? What are your experiences and recommendations? Thanks and 73, VA3SFA/W6
EA3IAV #28109 I have this one good on rx but poor on tx whizz loop antenna by moonraker there are two versions starting from 7 or 14mhz
John P #28163 I put a "Hamstick" dipole in the attic. Receives pretty good, but doesn't seem to be transmitting good. I still need to tweak it more, but it's way too hot up there now! I think one of the problems might be that the attic floor is insulated with foil backed insulation and only about 4 1/2 feet below the antenna. That can't be helping. Still trying to come up with a better plan! -- John - WA2FZW
Lawrence Galea All Messages By This Member #28164 HI, If your apartment is high enough you can (during darkness) put out the longest fishing pole out of the window that you can manage and drop a wire vertically down. You can feed it with small coax, say RG58, at the end and run another wire back to the shack or to the roof for the other leg of a dipole. Better if you wind a few turns of the coax feeder around a suitable former before it enters through the window to act as a choke to RF current which would be induced in the shield by the other leg coming back to the house. Also if you are high enough and there is something that you can tie the other end to and which is high enough not to be reached or obstruct anyone or any vehicle you can tie the end to it using small gauge wire supported throughout its length with nylon fishing line which will be practically invisible if it is high enough and thin enough. You can also rig an inverted V in this manner if you have two anchor points. You have to use your imagination to see what you can pu up. I used to have a 160 metre dipole in this manner and it was practically invisible from the ground unless you knew about. Regards Lawrence toggle quoted message Show quoted text On Sun, Jun 11, 2017 at 11:12 PM, EA3IAV <Cesarleon@...> wrote: I have this one good on rx but poor on tx whizz loop antenna by moonraker there are two versions starting from 7 or 14mhz

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