Anyone recognise this driver ?

[shuffy]

2N3866 is not the wright way i think

2N3866 is a 28V device, i'd be interested (well, all right, not that interested) to see how he's driving it to get a Watt out at 15V. If he's overdriving it, there will be nasties he doesn't want. I'm pretty sure everything's fine because his specifications on ebay say that at 15V supply, he's getting 1000mW out and harmonics are 60dB down and spurii 85dB down.

[radio-berlin]

lol

[radio-berlin]

@ Berlin
Yes mate it looks like this
Our station logo from 2009 before the big raid

Ill let you off, last time i give you teamviewer access lol...

smile face.jpg

[RF-Head]

Nice picture of a realy nice and good working amp

[teckniqs]

@ Berlin
Yes mate it looks like this
Our station logo from 2009 before the big raid

Haha, with a logo like that I can't help wondering why!

[teckniqs]

2N3866 is not the wright way i think

2N3866 is a 28V device, i'd be interested (well, all right, not that interested) to see how he's driving it to get a Watt out at 15V. If he's overdriving it, there will be nasties he doesn't want. I'm pretty sure everything's fine because his specifications on ebay say that at 15V supply, he's getting 1000mW out and harmonics are 60dB down and spurii 85dB down.

It's probably their way of getting less power output like 500mW or something, he probably bought a shit load of them very cheap. I've had about 750mW out of one with 15v supply but that was about the best I've seen out of one...

[shuffy]

I've had about 750mW out of one with 15v supply but that was about the best I've seen out of one...

You've done better than I ever have, then! I might have been suggesting that I don't believe his specifications!

[pjeva]

I've had about 750mW out of one with 15v supply but that was about the best I've seen out of one...

You've done better than I ever have, then! I might have been suggesting that I don't believe his specifications!

It's 28V device with fairly low gain... it will never give 1W with 12 or 15v supply

[thewoodstarr]

It looks like one of the old BW boards from around 15 years ago but don't quote me on that!

...I know someone that will know though but it's a matter of being bothered to ask him for you.

Hi, its is similar, but the board you were thinking of, that was was a Doubler Circuit, so you had a Local OSC @ 50 Mhz, then into Doubling coils and finally a 2n4427 output stage. I used it. Harmonics were not good, around 30 dB if you tuned it correctly. It was good for the time, and when used in conjunction with a good stable amp, it worked fine.

[sinus trouble]

Its not a frequency doubler!! its ON frequency! judging by the PCB artwork? it looks like a copy of a BW design by PCBWIZARD from ebay! i have one of his stereo encoders and filtering is poor! id like to see its performance?

[radio-berlin]

yes it on frequency.
Theres a few schoolboy errors with it which could be fixed easily.... Only one varicap diode for both audio and pll is one of them.... no regualtor for oscillator, so will hum around rf or toridiol power supply.
Shame because it would be ok otherwise

[thewoodstarr]

sinus trouble

You said, "Its not a frequency doubler!! its ON frequency! judging by the PCB artwork? it looks like a copy of a BW design by PCBWIZARD from ebay! i have one of his stereo encoders and filtering is poor! id like to see its performance?"

If you had read my post correctly, you will see have said, it similar to the old board, but the original was a doubling Circuit.

What someone has done, they have nicked the old design, stuck a 100 Mhz OSC in it, taken the Doubling circuit out, and buffered it to the final output stage. Next to any sizeable amp, it will Hum like bugger

Anyway this is an old design, and should be laid to rest.

[sinus trouble]

Mr Woodstarr
I know exactly what you said!
Ive never known BW use a frequency doubler style configuration on any of their designs?
I could be wrong though? maybe you could correct me?

[sinus trouble]

But Yeah! as mr berlin pointed out, it does have its flaws!
Its a classic osc + buffer + pre amp + PA config! which must be pretty stable in itself, otherwise it would be a waste of time including a PLL

[teckniqs]

Does the rotary tuning 1w PLL I had from them have a doubler, doesn't appear so...?

http://mail.blockyourid.com/~gbpprorg/l ... _plus.html

[shuffy]

Ive never known BW use a frequency doubler style configuration on any of their designs? I could be wrong though?

You're wrong Sinus, sorry. Their early designs (pre BW) and this breakthrough one all used doublers.
viewtopic.php?t=400#p3058

[shuffy]

Does the rotary tuning 1w PLL I had from them have a doubler, doesn't appear so...

Don't think that one did. BW changed to on-frequency very shortly after the design I linked to in the previous post - the same time they incorporated the transformer match to the PA. Main reason was to reduce the tuning required to set up. Around this time, they also incorporated an OLPD circuit but I can't remember if they had a go at doing this in a design which also featured a doubler.

You could make the doubler stage unstable by tuning it incorrectly with the board connected to a PA, and with the OLPD circuit, keeping a doubler would have meant an extra stage needed to achieve the required drive for equivalent power out at the same supply voltage.

[sinus trouble]

Thankyou Mr shuffy for your knowledge!
I beleive that BW probly experimented with a doubler? but the schematic Mr Pjeva (rig doctor) posted is not a doubler!

[shuffy]

the schematic Mr Pjeva (rig doctor) posted is not a doubler!

Confusion reigns! The "rig doctor" schematic (in the other thread) is a doubler and very similar to the circuit used by the BW board mentioned by Woodstar. In that schematic, Q3 is the doubler.

The one posted in this thread is not the "rig doctor" circuit. It's one of the BW PLL Plus's, and as you say is not a doubler.

[sinus trouble]

Ahh I see! Apologies people! a complete cockup on my part!
Im thinking that design must work similar to a crystal oscillator style then, tuning to a harmonic? rather than the NRG style??