Hi,
I am wondering if someone could help me with finding the pll look up table for this exciter?
I did get help on the old radionecks forum but unfortunately I didn't save the information

Many thanks

Was it not something like
all switch of 87,50
and then
0,1-0,2-0,4-0,8-1,6-3,2-6,4-12,8
for switch
1 2 3 4 5 6 7 8

so if you want the pll on 94.2
94,2 - 87,5 =6,7 so switch 7 and 1 and 2 must be on

That is a D*** B**man PLL, I'm sure if you can tell us what it's currently set to we could easily work out how it's done looking at the switch positions for its current frequency??

Hi there,
It is currently set to 106.5
off,on,on,on,on,on,off,on

Cheers lads!

RF-Head, your method seems to add up for the frequency it's set to. I'll try retune it when I get my hands on it.

He's called RF Head for a very good reason.

Is there any other components on the underside of this board? Looks very minimalistic, what chip(s) it use?

s2000 wrote:Is there any other components on the underside of this board? Looks very minimalistic, what chip(s) it use?

I asked the same question on the original Radionecks forum. Apparently there is some surface mount stuff on the other side - I presume the PLL chip, and the VCO.

IIRC you are correct, there is a small SM chip on the underside.

I would think a chip, and probably a few transistors (about 3 at a guess)......
Quite possibly a varicap or two. I can't see any in the piccy.

1x mc145170
3x bfr93 or SMT version of a mpsh10
2x varicap
Thats all

RF-Head wrote:1x mc145170
3x bfr93 or SMT version of a mpsh10
2x varicap
Thats all

Looks like the RF circuitry, is either the same, or very similar, to his old (pre SM) driver boards; replacing what used to be BSX20 / 2N2369, with BFR93 on the track side.

Does anyone have a circuit diagram / PCB layout for this design? Even a detailed closeup of each side of the board with be useful. Cheers

Layout is very similar (or same) as Broadcast Warehouse 1W Pll Exciter... there is full schematic on internet, just google it

Thanks pjeva.

Were you referring to this BW unit....



.... 'cos they look quite different?

Well, Broadcast Warehouse had few designs of pcb, mostly different in pll section. But i think think that is the one. Take this with reserve because i haven't seen board from original post in life

From what I've seen, I think all the “London Rigs” are based around the same circuit with maybe a few difference between them. Take a look at the thread Analyser's Draw Of Pirate History, and you'll see they all pretty much use the same components and layout, with differences in the PLL or single/double sided. If you have the schematic Rig Doctor put out on the original Radionecks you should be able to understand the rest. If you don't have it I can repost it?!

One more difference would be half-frequency and at-frequency designs. Dai Pole, if you have schematic, please upload...

rigdoctors schematic

Just to mention, for users that don't know already, all transistors are NPN, thats error in the drawing...