PLL Chart for this exciter

shpongler · Post by **shpongler** » Mon Dec 15, 2014 10:26 pm

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

RF-Head · Post by **RF-Head** » Mon Dec 15, 2014 10:41 pm

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

teckniqs · Post by **teckniqs** » Mon Dec 15, 2014 10:53 pm

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??

shpongler · Post by **shpongler** » Tue Dec 16, 2014 12:32 am

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

Cheers lads!

shpongler · Post by **shpongler** » Tue Dec 16, 2014 1:03 am

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.

teckniqs · Post by **teckniqs** » Tue Dec 16, 2014 2:28 am

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

s2000 · Post by **s2000** » Sun Dec 21, 2014 4:53 pm

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

Dai Pole · Post by **Dai Pole** » Mon Dec 22, 2014 12:40 pm

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.

teckniqs · Post by **teckniqs** » Mon Dec 22, 2014 2:01 pm

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

Shedbuilt · Post by **Shedbuilt** » Mon Dec 22, 2014 3:44 pm

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.

RF-Head · Post by **RF-Head** » Tue Dec 23, 2014 8:47 am

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

Shedbuilt · Post by **Shedbuilt** » Wed Dec 24, 2014 8:16 am

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.

SolderingOn · Post by **SolderingOn** » Mon Dec 29, 2014 6:23 pm

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

pjeva · Post by **pjeva** » Mon Dec 29, 2014 7:34 pm

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

SolderingOn · Post by **SolderingOn** » Mon Dec 29, 2014 8:30 pm

Thanks pjeva.

Were you referring to this BW unit....

.... 'cos they look quite different?

pjeva · Post by **pjeva** » Mon Dec 29, 2014 11:14 pm

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

Dai Pole · Post by **Dai Pole** » Mon Dec 29, 2014 11:43 pm

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?!

pjeva · Post by **pjeva** » Tue Dec 30, 2014 8:25 am

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

shorty · Post by **shorty** » Tue Dec 30, 2014 1:14 pm

rigdoctors schematic

pjeva · Post by **pjeva** » Tue Dec 30, 2014 6:34 pm

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

PLL Chart for this exciter

PLL Chart for this exciter

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