RADIO simple PNP output PA Morse Code

294

03:17:26

/Radio/tx/sine in/PNP/sign-out/cw/

The advantage of PNP here is that it can be keyed more easily. Admitted, that this is the typically simplified thinking of cw QRP  old school types. One more transistor would enable a more favorable NPN output transistor to be keyed. 

On the other hand, its simplicity that the QRP design is looking for. 

I forgot to mention that in some RF QRP circles, its thought that this configuration using a PNP output transistor produces less 'chirp'! This is an effect that makes the resultant CW (Morse or other ASK) sound like a chirping bird. I don't know if PNP transistor switching is helpful or not, in this respect. 

I do know that the real solution is pulse shaping circuitry that allows the power to the PA stage to gently rise and fall! Contemplation and meditation!

As ever I welcome the community comments from trolls, know it all professor buggers and others. Alteratively, you could add constrictive criticism? No? Oh OK then well it was nice while it lasted. 

Enjoy

73

published 7 years ago

zorgrian

7 years ago

Please note the original date of this offering. I no longer post up my latest thoughts or circuit ideas for fear of the inevitable barrage of attack that i have experienced in the past. This is killing the EC community! It is because we lack a simple "block this user" function. Passive blocking does not work here. Without this blocking function EC becomes a free troll site and worse, its wonderful community suffers to the point of extinction!

zorgrian

7 years ago

My other thought on the current EC troll situation is that it is possible to envisage trolls coming here with a deliberate agenda of destroying EC! Those might be proponent's of the buggy horrible iCircuit?

Robert_Kidd

7 years ago

zorgrian, he is a bear of little brain. Ignore the idiot.

roops1967

7 years ago

zorgian the 'block user' button won't be any good with this asshole here. He's changing his username daily courtesy of the free 24h trial periods, and unjustly he stays anonymous and creates as much havoc as he wants all for FREE!!

roops1967

7 years ago

The only way to get rid of him is to close that free trial back door - The freeloading leech will definitely not register to pay for the app and give up his anonymity

hurz

7 years ago

But the input current does fade away in this class C mode type PA. The cap has only one way to charge, from emitter basis diode. To avoid that you can place a diode for the reverse way of current http://everycircuit.com/circuit/6681141221523456

zorgrian

7 years ago

Thats odd, you must be right as the offensive little minded idiots comments have dissolved, evaporated, disappeared. He is a dead parrot!

zorgrian

7 years ago

Yeah, thats great! Cheers @hurz. Thats much better! Still, i don't use PNP output PA stages myself. Mainly because i dont have adequate parts in my junk box

zorgrian

7 years ago

However, i will try your circuit and put it up on YouTube, once I've cleared the backlog of work I've got to do. I will post the build and test link to the YouTube video here once done!

zorgrian

7 years ago

Trolls and blocking ----∆∆∆--- i guess that the reason for offering the short free trial period is due in part to diminished membership. Now this could be as the result of other platforms, like the incredible iCircuit offering, or and other factors. Since iCircuit is the only one that has similar rational and functionality, it cant really be a serious contended for competition with EC. This is due to its inerrant buggy rubbish coding. Whereas EC is solid and very well designed. Now, this leaves the trolling and other problems that affect the EC world. These types of problems do put people off. So far be it for me to say how to run EC, but it would seem that a business model allowing more trolls in under many names per week is counterproductive!

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