Frequency doubler.
 

I whant to double a frq. between 200 and 265 MHz. I had tryed to used the
Mini-circuits RK2 doubler and som BP filters, but because of the band pass
200-265MHz it is diffeculd for me to suppress the input frq. and the 3*inp.
to min 50-60dB.
Is there any other ideas to realise this.

--
Frank Mikkelsen

University of Aarhus
Institute of Physics & Astronomi
Nymunkegade, Bygn. 520, room 432
DK-8000 AArhus C
Denmark

Phone +45 89423799 or +45 89423795
Fax: +45 89423794

Frank Mikkelsen wrote:

I whant to double a frq. between 200 and 265 MHz. I had tryed to used the
Mini-circuits RK2 doubler and som BP filters, but because of the band pass
200-265MHz it is diffeculd for me to suppress the input frq. and the 3*inp.
to min 50-60dB.
Is there any other ideas to realise this.

--
Frank Mikkelsen

University of Aarhus
Institute of Physics & Astronomi
Nymunkegade, Bygn. 520, room 432
DK-8000 AArhus C
Denmark

Phone +45 89423799 or +45 89423795
Fax: +45 89423794

Another approach is to lock an oscillator running at the output
frequency to the input. Try dividing the oscillator by two and use that signal
to compare to the input.

Bill K7NOM

Frank Mikkelsen wrote:

I whant to double a frq. between 200 and 265 MHz. I had tryed to used the
Mini-circuits RK2 doubler and som BP filters, but because of the band pass
200-265MHz it is diffeculd for me to suppress the input frq. and the 3*inp.
to min 50-60dB.
Is there any other ideas to realise this.

--
Frank Mikkelsen

University of Aarhus
Institute of Physics & Astronomi
Nymunkegade, Bygn. 520, room 432
DK-8000 AArhus C
Denmark

Phone +45 89423799 or +45 89423795
Fax: +45 89423794

Another approach is to lock an oscillator running at the output
frequency to the input. Try dividing the oscillator by two and use that signal
to compare to the input.

Bill K7NOM

Frank Mikkelsen wrote:
I whant to double a frq. between 200 and 265 MHz. I had tryed to used the
Mini-circuits RK2 doubler and som BP filters, but because of the band pass
200-265MHz it is diffeculd for me to suppress the input frq. and the 3*inp.
to min 50-60dB.
Is there any other ideas to realise this.

Full-wave unfiltered rectification, followed by bandpass filter?

--
All relevant people are pertinent.
All rude people are impertinent.
Therefore, no rude people are relevant.
-- Solomon W. Golomb

Frank Mikkelsen wrote:
I whant to double a frq. between 200 and 265 MHz. I had tryed to used the
Mini-circuits RK2 doubler and som BP filters, but because of the band pass
200-265MHz it is diffeculd for me to suppress the input frq. and the 3*inp.
to min 50-60dB.
Is there any other ideas to realise this.

Full-wave unfiltered rectification, followed by bandpass filter?

--
All relevant people are pertinent.
All rude people are impertinent.
Therefore, no rude people are relevant.
-- Solomon W. Golomb

Hi,
the filters shown at
http://w1.859.telia.com/~u85920178/conv/xtal-0.htm might help you.

BR from Ivan OK1SIP

Hi,
the filters shown at
http://w1.859.telia.com/~u85920178/conv/xtal-0.htm might help you.

BR from Ivan OK1SIP

Frank Mikkelsen wrote:
I whant to double a frq. between 200 and 265 MHz. I had tryed to used
the
Mini-circuits RK2 doubler and som BP filters, but because of the band
pass
200-265MHz it is diffeculd for me to suppress the input frq. and the
3*inp.
to min 50-60dB.
Is there any other ideas to realise this.

You might use a pair of MMIC's in push-push. Get gain AND cancellation of
fundamental and odd harmonics.

W4ZCB

Frank Mikkelsen wrote:
I whant to double a frq. between 200 and 265 MHz. I had tryed to used
the
Mini-circuits RK2 doubler and som BP filters, but because of the band
pass
200-265MHz it is diffeculd for me to suppress the input frq. and the
3*inp.
to min 50-60dB.
Is there any other ideas to realise this.

You might use a pair of MMIC's in push-push. Get gain AND cancellation of
fundamental and odd harmonics.

W4ZCB

Full-wave unfiltered rectification, followed by bandpass filter?

Clifto-

Doesn't full wave produce a symmetrical waveform that minimizes even harmonics?

73, Fred, K4DII