[NLRS] Mixers and IF rigs

[Dr. Gerald N. Johnson, electrical engineer]

I'd add some attenuation with a diode clipper though a single pair of
silicon diodes will clip at 3.6 mw, far below the +12 dBm you probably
want to put on the IF of the mixer when transmitting. Another scheme
adds say 20 dB of attenuation to calm the spike, then make it up on
receive with 20 dB gain after the mixer (say a couple MAV-11 cascaded to
have pretty good NF and better dynamic range). You may find the spike to
signal ratio much smaller with the FT-100 set to put out a few watts to
a fixed attenuator.

Or use the fast silicon diodes (not schottky) after the attenuator and
use one or two MAV-11 to get the power up to drive the mixer fairly
hard.

Just mixing, it can probably do with most of the diodes blown, after a
fashion. Its a better check to see that the mixer loss or NF is
unchanged.

73, Jerry, K0CQ

-- 
Entire content copyright Dr. Gerald N. Johnson, electrical engineer.
Reproduction by permission only.