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VK6JY > QRP 27.09.02 23:49l 22 Lines 893 Bytes #999 (0) @ WW
BID : 53165-VK6JY
Read: GUEST
Subj: Balanced Mixer CCTs
Path: DB0ZKA<DB0GPP<DB0LX<DB0CZ<DB0GV<DB0SIF<DB0NHM<DB0ERF<DB0FBB<DB0GOS<
ON0AR<ON0AR<7M3TJZ<JE7YGF<CT2GWY<VK8PDG<VK6HGR<VK6BBR<VK6RAW<VK6PBV<
VK6JY
Sent: 020927/2159Z @:VK6JY.#ALY.#WA.AUS.OC #:53165 [Albany] FBB7 $:53165-VK6JY
From: VK6JY@VK6JY.#ALY.#WA.AUS.OC
To : QRP@WW
Hello to QRPers Regarding bulletin from Ian, G3YRQ
Check the manuals for diode balanced mixers. More particularly,
see the ARRL handbook -- re: Doubly Balanced Diode-Ring Mixers.
There was also a heap of material about some `high performance'
commercial modules available (1987 ARRL) which are still about.
Home brew versions of these at HF will be okay. The commercials
typically cover from 0 to 500 MHz. You'd need a couple of tiny
trifilar wound ferrite toroid xfmrs and 4 small-signal diodes,
preferreble hp hot carrier types - all for a few cents each.
High oscillator injection is needed, compared to mixers with a
lot of conversion gain. Very low-noise bipolars are recommended
around them too. Circuit to follow.
73 - John.
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