[Premium-Rx] RACAL HF ACTIVE ANTENNA AE3001/A/C/LP2 WITH DATONG OR WELLBROOK INTERFACES

[Dave Jones via Premium-Rx]

Hi, been away for a bit, many thanks for all your replies, especially for  
the manual scan, its perfectly useable, no need for a better copy. I 
dismantled  the aerial head unit, until I read the manual, I had no idea it could 
be opened  without destroying it!! It appears to be a /C model, 1 to 100MHz, 
backed up by  testing, so I thought it would be easy enough to convert to 
the more VLF version  by cutting the link (or links) one for disabling the 
co.ax fed power and the  other to disable a simple low pass filter, boy was I 
wrong! (stop reading now if  bored!) anyway, to save drilling holes in it for 
a power feed cable, LK2 needs  to stay in place, but there is no LK1 
present, instead, its a spark gap!, So  theoretically it should work down to VLF, 
but test results show it very poor at  MSF, Also inside is a small PCB with 
RACAL on it, so must be factory, and on it  are two small things that look 
like mini relays, but I think they are variable  attenuators, variable in the 
sense of which pins you use determining the freq.  and/or attenuation. I am 
going to try to draw out the circuit later. While I am  here, does anyone 
have the circuit of the WELLBROOK loop aerial interface unit,,  or the DATONG 
version, I am going to try and adapt one of these to suit the  RACAL, Dave 
MW1DUJ.
 
 
In a message dated 22/04/2015 07:46:34 GMT Daylight Time,  
premium-rx at mailman.qth.net writes:

Hi  Dave

I wondered where that one went, I quite sulked to have missed it  at the  
time:-)

Some versions take the supply up the coax,  some have a separate power 
feed, 
all require +31 volts DC.
It's a  fairly standard active whip circuit, FET input and bipolar output,  
 
in this case though the former is a 2N6660 medium power MOSFET that  Racal  
insisted had to be the Siliconix part.

About ten years  ago I scanned the manual for these but looking at that  
again now I  can see the limitations of the scanner I was using, probably 
of  
the  bloke doing the scanning too:-), and am not best impressed with my   
efforts, so if you can bear with me I'll do it again today and let  you  
have a 
better copy  later.

Regards

Nigel
GM8PZR


In a message dated  22/04/2015 02:19:19 GMT Daylight Time,  
premium-rx at mailman.qth.net  writes:

Hi, I  have recently acquired one of these fine looking  beasts, a black   
plastic blob with a lovely water shield/ground  plane, and about 1M whip  
attached  to the top, the only thing  is that it came with no  paperwork or 
interface 
necessary to  power the aerial. Presumably, one  sends the supply voltage 
up  
the  CO-AX aerial feed, like the  interfaces popular with  Wellbrook, 
Datong 
etc, and I  am sure that if  I looked that I  could find one of these, but 
the 
question is,  what  is the  voltage that needs to go up the CO-AX? Has 
anyone 
got any ideas,   or  better yet, racal paperwork for it? Maybe its standard 
12V,  if  so, I might try  it with my JRC receiver which has a switched 12  
volt  
supply which can be  switched in or out of the aerial  feed, any help  much 
appreciated, Dave.    MW1DUJ.
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