R Martin
Well that's the problem, we all know what the kit can do , but there
are only a few who can tap the keys and make it perform ..
Like Jim mentioned , other modes , now , I think the read/refresh rate
of a counter/timer and your f-gen over the ieee would be fast enough
to follow a slow qrss , mfsk opera or other single carrier mode , by
reading , process , output to the f-gen
a sort of eccentric cam software mechano chain drive .... with a limit
switch hihi ,must be HP dev guy about ??
That's the problem, software people , ( may be by default) are not
pioneering and the hardware gang never did get the idea of a keyboard
! Everyone though the Opera idea was crazy , (most still do:) , its
far removed from the simple data system that I envisaged , but I had no
idea , as to how advanced the world of DSP actually was .. still not
quite sure , but there a lot of apples laying about for some reason !!
807 6v6 ef50 cv138 still got boxes of those in the shed along with
all the other big lumps of transformers and things that would probably
go bang if powered up . as kit and age advanced retreated indoors to
the warm !
I think your keying relay would be OK for OP8 .as long as the pull in
and release times are well matched to retain the envelope shape .. this
side of the DSP engine is a bit of a mystery , basically, the closer to
the original time envelope and frequency stability , the better will be
the decode min s/n (low % improvements )
I think pulse 'jitter' would be a problem on the higher (shorter)
versions ...... could you not use blocking keying or a pin diode
switch ? ,,,,,,,,,Racal use to use TTL logic gate chips to switch
oscillator lines , by holding one side of a (and) hi or low ..... or
use a opp-amp as linear switch ...
GL - 73 -G..
--------------------------------------------------
From: "Martin Evans" <[email protected]>
Sent: Saturday, May 12, 2012 7:47 PM
To: <[email protected]>
Subject: Re: LF: IEEE488
Well, what you're saying could sound simple to you, Graham, but a nice
keyed relay sounds a lot simpler to a Silver Surfer brought up on 6V6s and
807s!
Martin GW3UCJ.
~~~~~~~~~~~~~~~~~~~~
It may be possible , IEEE cards for PC are available on ebay ,
originally it was complimentary to HP basic, and used the HP range of
PC's with addressed card slots .. allowed you to construct a
automated system from discrete items of equipment ..HP unless you
hacked your own control card , going back to 1972 is the first I
remember , linked to HP neon nixie tubed DVM and Counter / timer ,
with a IEEE>GEC re-hash on the back ,
The IEEE drivers (Instrument set up frame) should be downloadable
from the R&S web site , as to qrss , you would need to interface
with the HP-basic control programme , read a switch/button or line
voltage , I dont think it would be simple to bridge .but you could
set up a series of carrier on.off timed commands in basic , but its a
big task for a task that is covered by other software
unless for example the LCD display has finally washed out and the
IEEE is the only way to set the instrument up , in which case its
quite simple , just run the set-up frame and control from the pc
in remote mode , a useful second life !
73 -G..
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