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-   -   New long wire AM aerial and switching box (https://www.vintage-radio.net/forum/showthread.php?t=193398)

stevehertz 5th Aug 2022 4:41 pm

New long wire AM aerial and switching box
 
1 Attachment(s)
I already have a long wire AM aerial feeding into my house for domestic radio use. Just recently, fed up with inadequate AM performance in my workshop I erected another long wire (it's a big garden) to feed that building. Usual techniques, a long length of insulated wire attached using egg insulators to two tall, strong trees and then down and into my workshop. Once inside the wire has the dual function of feeding a 'permanent' Tandberg stereo receiver setup that I listen to, and also any set that's 'on the bench'. I could have just fed the wire to both, but obviously that's not best practise as it's loading the aerial twice. So I just made a simple switching box using an old RS diecast box that I bought decades ago, as the housing. Ha, so many times in the past I've looked at that box and thought, "I'm never going to use that". Obviously, just a double throw switch inside. It all works fine and I can get Radio Caroline, not brilliantly, but I can receive it (I'm in Rugeley, Staffs). I haven't yet tested the aerial on a known, 'good quality' AM set so who knows, Caroline may even get better, up to listenable quality.

Sideband 5th Aug 2022 5:52 pm

Re: New long wire AM aerial and switching box
 
You might be able to improve it even more by placing a 100pF variable cap in series with the aerial and tune for maximum. It may also be worth trying an ATU (Aerial Tuning Unit) which is a bit more complex using a coil tuned by a variable cap. Various designs can be found via Google

Cruisin Marine 5th Aug 2022 7:03 pm

Re: New long wire AM aerial and switching box
 
Build a pi tank ATU and you will be able to peak it to hear almost anything. I would add an RF choke across the antenna terminals to discharge any static, a 2.5 mH or similar to protect you and your receivers, and disconnect the antenna and connect it to earth when storms approach. Best you have a decent earth stake nearby.


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