Hi Mark,
I am also looking for a spectrum analyser ;-)
No, I am not able to measure the spectrum of the MA1723 but is is really
outstanding compared to my other radios.
The factory specs only quote the following:
Wideband noise better then -110db relative to PEP in a 3KHz bandwith 500KHz
off tune.
IMD better then -50db relative to either of two equal tones in a standard
two tone test.
Spurious emissions other then harmonics -55db.
The amplifier module with BLW96 you mention I probably bought on a flea
market without documentation, do you have some info, at least the circuit
diagram for me?
73
Peter, DF3KV
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
Behalf Of Mark Hill
Do you know how clean the synthesiser is in the
MA1723? I have often wondered, as its quite an
old design, but never had the equipment to measure it.
The old Racal TX I use from time to time on-air
features an MA1723 as the exciter, followed by a
Class A solid state stage (drawing about 10 Amp
at 28 Volt with a pair of BLW96 to give 10 - 20
Watts for the valve [passive] grid!), followed by
a single 4CX1500B. The valve section, has two
motor driven roller coasters (for L1 and L2 in
the Pi-L) and enough solenoids and relays to keep
this OM amused. The TX has full auto tune (about
5 seconds tune time for any freq. between 1.6 -
30 MHz) and is truly a thing of beauty.
If anyone has an unwanted spectrum analyser,
please send it to me. I'll wait in all day for
delivery and post any useful measurements I make back here pro bono!
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