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Date: Sun, 17 Apr 2011 14:42:22 +0100
Message-ID: <BANLkTimLPdLrPhvyoSbMo1pqGE8QK2zoVg@mail.gmail.com>
From: Andy Talbot <andy.g4jnt@gmail.com>
To: rsgb_lf_group@blacksheep.org
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Subject: LF: Racal ATU Board Details
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I picked up a rather nice PCB at the Andover Rally; the RF and relay drive
unit for a Racal Auto ATU.
It consists  of 25 reed-relays switching inductors and capacitors in a
binary tree.   All relays have individualy drive electronics, and on the
input to the PCB are seven  74HC595 8 bit shift register / latches.    Which
gives 56 bits of drive,  twice the storage capacity of what the 25 relays
look as if they want !

Does anyone have any information or ideally a  circuit diagram pse.?
The PCB is marked IATU PSB ASSY    49362-124-00         and    CCK4800  on
the top side.
On the underside is marked 39362-724-00

PCB dimensions 190 x 130mm.    There is a 10 way header for power and data,
so the switching data for the relays must be shifted in serially.

Its a nice little module, and just asking to be connected to a PIC and
turned into a manually set-up ATU with digital memory.   And would go
wonderfully well with my multiband WSPR beacon.

If I can't find the serial drive requirements looks like it may be a case of
tracing out the circuit which is going to be difficult as it s a multi layer
board  - or ripping teh drivers out and using my own drive electronics.  At
least serial input high voltage driver chips are readily availalble

And I'd really like to know why there is twice as much digital storage as it
appears to need.     As a ping-pong buffer for frequency hopping perhaps ???

Andy
www.g4jnt.com

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<div>I picked up a rather nice PCB at the Andover Rally; the RF and relay=
 drive unit for a Racal Auto ATU.=A0=A0 </div>
<div>It consists=A0 of=A025 reed-relays switching=A0inductors and capacito=
rs in a binary tree.=A0=A0 All relays have=A0individualy=A0drive electroni=
cs, and on the input to the PCB are=A0seven =A074HC595 8 bit shift registe=
r / latches.=A0=A0=A0 Which gives 56 bits of drive,=A0 twice the storage=
 capacity of what the 25 relays look as if they want !</div>

<div>=A0</div>
<div>Does anyone have any information or ideally=A0a=A0=A0circuit diagram=
 pse.?=A0=A0 </div>
<div>The PCB is marked IATU PSB ASSY=A0=A0=A0 49362-124-00=A0=A0=A0=A0=A0=
=A0=A0=A0 and=A0=A0=A0 CCK4800=A0 on the top side.</div>
<div>On the underside is marked 39362-724-00</div>
<div>=A0</div>
<div>PCB dimensions 190 x 130mm.=A0=A0=A0 There is a 10 way header for pow=
er and data, so the switching data=A0for the relays=A0must=A0be shifted in=
 serially.=A0=A0 </div>
<div>=A0</div>
<div>Its a nice little module, and just asking to be connected to a PIC an=
d turned into a manually set-up=A0ATU with digital memory.=A0=A0 And would=
 go wonderfully well with my multiband WSPR beacon.</div>
<div>=A0</div>
<div>If I can&#39;t find the serial drive requirements looks like it may=
 be a case of tracing out the circuit which is going to be difficult as it=
 s a multi layer board =A0- or ripping teh drivers out and using my own dr=
ive electronics.=A0 At least serial input high voltage driver chips are re=
adily availalble</div>

<div>=A0</div>
<div>And I&#39;d really like to know why there is twice as much digital st=
orage as it appears to need.=A0=A0=A0=A0=A0As a ping-pong buffer for frequ=
ency hopping perhaps ???</div>
<div>=A0</div>
<div>Andy</div>
<div><a href=3D"http://www.g4jnt.com/">www.g4jnt.com</a></div>
<div>=A0</div>
<div>=A0</div>
<div>=A0</div>
<div>=A0</div>

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