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

Wed May 6 08:24:20 EDT 2015

Hi Chuck

I'd appreciate a copy of your schematic please.

A good place to upload stuff like this is Didier Juge's (KO4BB) manual  
site, that's where I put the scan of the manual.

Regards

Nigel
GM8PZR

In a message dated 06/05/2015 13:13:29 GMT Daylight Time, chuck at urmson.net  
writes:

Hi  Dave,

You have the version of the AE3001 that has been modified for  Nuclear
Electromagnetic Pulse (NEMP) protection.  If you remember  there was a
man called Saddam Hussein who, it was claimed at the time, had  WMD.  So
I guess Racal and everybody else had to play along with the  myth and
modify their kit before it could be shipped off to Iraq.  

While the non-EMP version of the antenna does work at 13.8V I  would
recommend that you supply the 31V as specified to maximize  performance
especially IMD.  I also can't remember what the relay  voltages are so
that may also present a problem with your version.

I  will email my hand-drawn version of the schematic to you separately. 
If  anyone else would like a copy or has a site where I can post the
schematic  please let me know. 

Regards,
Chuck EA8DBU/M1DPD

If you  give me six lines written by the hand of the most honest of men, I 
will find  something in them which will hang him.
Cardinal Richelieu

On  06/05/2015 12:37, Dave Jones via Premium-Rx wrote:
> 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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