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QRP broadband amplifier schematic needed

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neazoi

neazoi

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hello,
I need a schematic for a broadband amplifier covering the 1-30MHz range.
Input about 50-100mW
Output 1-2W or 1-10W

Preferably a Class-A non-push pull design

The attatched file is an example of exactly what I need. The problem is that the BLF175 contains toxic material and I do not like to use it. Is there any direct non-toxic replacement for this?
 

look this simple amplifier with common transistors

http://www.phonestack.com/farhan/jbot.html
**broken link removed**


jbot.gif


73 eduardo[/url]
 

    neazoi

    neazoi

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eduardo.ea3ghs said:
look this simple amplifier with common transistors

http://www.phonestack.com/farhan/jbot.html
**broken link removed**


jbot.gif


73 eduardo[/url]
Click to expand...

Interesting!

But not all the stages of the phonestack one do opetate in class-A. The final amplifier is a push pull class-AB one

Is there any other design for a final in class-A opetation using non-toxic transistors?
 

hello,

yes, it's true.

Check if something of this transistors can be useful for you:

**broken link removed**

RD16HHF1 – Pout >16 Watt RF Out – Gp >16dB - Vdd=12.5V - F=30 MHz -

RD06HHF1 - Pout >6 Watt RF Out – Gp >16dB - Vdd=12.5V - F=30 MHz -

RD00HHS1 – Pout >0.3 Watt RF Out – Gp >19dB -Vdd=12.5V -
 

Ah!
now this is a good solution for the experimenter, as this is designed for RF and not switching mode. is is very cheap too!
16W out from the RD16HHF1... I quess I could get at least 3-4W in class-A.

Great source, thank you.


I wonder if there is a bipolar transistor for the purpose?
 

hello neazoi ,
did you finish your amplifier project?
hhow much is the amplifier efficiency?
bye!
 

No, I build this amplifier **broken link removed** look near the end of the page.
If is a well performer throughout the HF bands, a good designed amplifier up to about 1W.

I have not yet tested a higher power version
 

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