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LF: Re: Can I match 2 frequencies with one loading coil?

To: <[email protected]>
Subject: LF: Re: Can I match 2 frequencies with one loading coil?
From: <[email protected]>
Date: Fri, 29 Jun 2018 19:00:02 +0100
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Stefan es Co
In the tube/valve era commercial radio stations used a non resonant antenna followed by a wide band 807 amplifiere/distribution network cathode follower low impedence to each Receiver. This is the same approach as used today but using transistor source followers as you mention in your msg.
The Transmitters  and associated antennas were remote to the Rx site.
eg both Transmitter and Receiver sites used rhombic antennas in the desired direction and both sites were several miles apart it is all old hat, nothing is new it has all been done before and today is just being Re invented
G3KEV


-----Original Message----- From: DK7FC
Sent: Friday, June 29, 2018 5:20 PM
To: [email protected]
Subject: Re: LF: Re: Can I match 2 frequencies with one loading coil?

...what about a non-resonanted antenna?
The active antennas cover LF and MF and even HF. Their output is
low-impdeant and one could build e.g. two source followers on the back
end. Then you can connect two receivers which don't 'see' each other.

If you don't like to build a separate active RX antenna (i would do so!)
then you could also use the large TX wire. Then you can even afford a
double or triple RC lowpass filter in the front end to attenuate the
strong MF broadcast stations (if there are still any).

73, Stefan




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