LF: Re: decca 5501

["mal hamilton" <g3kevmal@talktalk.net>]

More info requested

Xtal osc or VFO with output of 5V sq or sine wave not critical and 27V regulated at 300mA for driver stages and 60/70V for PA FETS

With an adjustable HT psu, regulation not required the output can be varied from Nil to 400 Watts.

de mal/g3kev

 

 

----- Original Message -----

From: mal hamilton

To: rsgb

Sent: Wednesday, June 13, 2012 6:29 PM

Subject: LF: decca 5501

MF

Now that MF is shaping up with DL permits and others. If you can find a DECCA sub unit 5501 it takes less than a couple of hours to modify/ adapt for the 472 Khz band. In round figure values all that is needed is a 22uH in series with 5 nF C. Adjust L for frequency of interest of centre of band. A matching transformer is then required to match approx 5 Ohms to 50 Ohms and LPF to the antenna.

I use an old tube TV LOPT and it works  well with good efficiency.

A couple of hours work and you can be on the new 473 band. A loaded inv L antenna and you are in business.

73 de mal/g3kev