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<DIV>Hi Leon,</DIV>
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<DIV>these Norton amplifiers were quite popular, but frequency limited. Do you
really need both, low noise, high S12 and high IP3. There are CATV transistors,
like the old BFT66 and successors who at 30 mA or so have the same IP3,
excellent 50 match and 1.5dB NF. Also some GaAs R-feedback ciruits with less S12
can provide stable concepts. As always, it depends greatly on the
application</DIV>
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<DIV>I built one of your RF amplifier designs many years ago - it used two
2N5109 devices in a balanced Norton amp configuration. Can you recommend a
similar device that is currently manufactured? I've been looking for one without
success for some time.</DIV>
<DIV> </DIV>
<DIV>73, Leon</DIV>
<DIV>--</DIV>
<DIV>Leon Heller, G1HSM<BR><A title=mailto:leon.heller@bulldoghome.com
href="mailto:leon.heller@bulldoghome.com">leon.heller@bulldoghome.com</A><BR><A
title=http://www.geocities.com/leon_heller
href="http://www.geocities.com/leon_heller">http://www.geocities.com/leon_heller</A></DIV>
<DIV> </DIV>
<DIV>Hi Alex, I dont know what these CASMIR and other names mean. We have
designed novel super low noise oscillators, as you can see from the Synergy web
site. The architecture determines the required frequencies. </DIV>
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<DIV>There are octave bandwidth oscillators, now up to 6 GHz. The loop and loop
bandwidth have a huge influence on the noise. The best way to deal with this is
to send me a block diagram to figure out the best architecture</DIV>
<DIV> </DIV>
<DIV>73 N1U</DIV></DIV></DIV>
<DIV> </DIV>
<DIV>Ulrich,<BR>I need a good LO design that will work with the Analog Devices
ADL5390 RF/IF Vector Multiplier to support CASMIR operations from 50 MHz to 2500
MHz. Basically 6m, 4m, 2m, 1.25m, 70cm, 33cm, 23cm, and 13cm ARS
bands.<BR><BR>Also need the LO to support a version of HORTON anf MERCURY for
50MHz and up.<BR><BR>Preferredly the LOs would be on a separate ATLAS board and
would distribute the generated LOs to VHF+ versions of CASMIR, HORTON, and
MERCURY. <BR><BR>A 10MHz GPS-disciplined reference signal will be provided
either single-ended via ATLAS of differential via a separate cable.<BR><BR>I've
had a couple thoughts on mixers for supporting the 9cm, 6cm, and 3cm bands, but
would be very interested in your ideas.<BR><BR>Alex,
N3NP<BR><BR></DIV></FONT></BODY></HTML>