Technical Topics > The RF Workbench
New 850mW HF beacon,
Teotwaki:
--- Quote from: QRP on February 07, 2022, 1352 UTC ---Have a close look att the Xtal 7030 MHz
and between XTAL and earth there is a diode.
Can you see it now? 😊
--- End quote ---
Based on your incorrect assumption there are 11 diodes between ground and the following components in the diagram
D1
C1
X1
C3
C5
C6
Key
R3
D2
D3
Audio pin 2
Do you see how wrong you are now? ;)
Those are ground symbols.
Look at component D2’s symbol: a triangle with a bar across the pointy end of the triangle. THAT is a diode symbol.
Teotwaki:
Common circuit diagram ground symbols 8)
Circuit diagram symbol for an ordinary diode
Stretchyman:
Christ, the post has become tiresome!
Yeh it's not a diode we get that.
I think the idea WAS to insert one for some reason?
Anyway, single device running flat out getting so hot it needs a heatsink.
There are way better designs.
Simple = compromised.
Osc-buff-class E PA, would use far less current.
QRP:
You’ve made my day! 🤣
//QRP
Teotwaki:
--- Quote from: Stretchyman on February 07, 2022, 1649 UTC ---Christ, the post has become tiresome!
Yeh it's not a diode we get that.
I think the idea WAS to insert one for some reason?
--- End quote ---
Glad you got religion but the OP doesn't need to be misled into putting QRP's useless diode in series with the crystal. I will credit QRP for having a high loss notch filter to assist in ignoring correct information.
--- Quote from: Stretchyman on February 07, 2022, 1649 UTC ---
Anyway, single device running flat out getting so hot it needs a heatsink.
There are way better designs.
Simple = compromised.
Osc-buff-class E PA, would use far less current.
--- End quote ---
Agree but the OP built it, can have fun running it and find out how short the life of the 2222 is then build something better. I would be more concerned that the crystal frequency will put the thing in the crowded Amateur 40 meter band. It should be padded to pull it below 7 MHz and be easier to hear at a distance.
To me it's not tiresome if the OP succeeds in having fun without QRP's bad information. If it was a _varactor_ diode then I would concede QRP might know something useful. ;)
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