Homebrew Antenna for DIY Receiver

OscarKilo

Member
Joined
Jan 13, 2020
Messages
11
Well I've had some success so far, I think I picked up Radio Havana Cuba last night. Is it possible that since I put the receiver in a plastic enclosure it might be able to feedback with my loop antenna? Perhaps the local oscillation in the receiver is picked up by the antenna and fed back into the receiver. There is a lot of squealing at some points even with the regen just barely set into oscillation. Oddly, the antenna attenuation switch seems to have no effect, I should probably check to make sure I wired it correctly.
 

majoco

Member
Joined
Dec 25, 2008
Messages
3,416
Location
New Zealand
Strictly speaking, that's not what I would call an attenuator - it just shunts some of the signal to ground IF it a 50 ohm source but you're using a loop ( with a separate pickup loop? ) so the impedance could be anything. The attenuator is really only needed with very strong signals which so far you don't have! Yes, you should have put the radio in a screened enclosure to stop the feedback, but perhaps you can line your plastic box with self-adhesive aluminium foil making sure the foil is connected to the negative battery terminal. Radio Havana puts out some strange signals including the "numbers station" - strong enough for me to hear in the later afternoon - 6.060MHz is good!
 
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