Re: PA problem on new QRSS TX, some progress ;-)
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Ok Hans. I don't think my efforts here will be terribly helpful.
I made the circuit (ugly style) and I have a problem with it. It had no efect.
Listening with a walkman earphone, I can hear the 'tick, tick' of the 1pps on the input to the diode and on the output too, but at the collector of the transistor a general purpose NPN, bc548, I get no ticks at all, just a hiss. I checked the component values; they are exactly as specified. I changed both the diode and the transistor. The 100n was a typical low tolerance brown capacitor marked '104'. I tried a variety of diodes including typical small signal type 1n4148. It had both ground and 5 volts connected, and I could hear the tick on the base but nothing on the output. I treble checked the pin outs on the transistor.
Sorry.
I'll try again with it tomorrow.
Tony
On 18 May 2013 11:16, g3zjo <g3zjo@...> wrote:
?
On 18/05/2013 09:33, Hans Summers wrote:
> PIC are a particular manufacturer
Yes I know all that, but you knew exactly what I meant and in my
engineering circles we always bandied terms about, quickest simplest
reference term is PIC and an SI570 does digital synthesis generation of
signals and so it can be a DDS if you like, sorry this is OT and silly.
Back to the Ultimate 2. With it Field Effect Switching Devices not PA
Transistors.
73 Eddie
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