[time-nuts] Sayrosa 607B Frequency Synthesizer
Mike Millen
mike.millen.uk at gmail.com
Sun Nov 25 18:46:25 UTC 2012
GandalfG8 at aol.com wrote:
> I haven't seen too many of these in the wild so can I assume this
> was the unit recently sold on Ebay?
It was indeed.
> If so you got an excellent drive unit at a very good price, even if it
> isn't working at the moment:-)
That's just what I thought. It's beautifully made... probably cost the
taxpayer a fortune in its day. :)
> FCO standard equipment with these was the HCD-1519 1MHz frequency
> reference and whilst they are specified to run from 1, 5, or 10MHz
I've tried it with both 1MHz & 10MHz & it locked up straight away with both.
> Is there a number showing on the display to go with your "Fault"
> indication, and are any other of the indicators illuminated?
Sorry... I should have mentioned that in my first post... it's showing Fault
4.
> It's possible a link may be required on one of the rear connectors to
> enable stand alone operation but again I can't remember offhand so
> will check and come back to you on that too, but there shouldn't be
> any significant wiring needed.
That's what I'm hoping.
> Like much equipment from that era though these units suffered the
> dreaded tantalum capacitor disease and it's quite possible that one
> or more modules may be afflicted.
I brought it up gently on a variac, monitoring the rails as I went. They
were all good until I reached 240v, then one of the +12v rails went to 0v.
I traced it to a s/c tantalum in one of the modules. :-) All OK now.
I'll be extremely pleased if you're able to shed any light on "Fault 4",
Nigel, or what jumpers/connnections I might need to make.
If you have any printed data I'd be happy to pay all your costs for a copy.
Regards,
Mike
M0MLM
> In a message dated 25/11/2012 09:39:11 GMT Standard Time,
> mike.millen.uk at gmail.com writes:
>
> This unit is a part of the UK's Diplomatic Wireless Service's
> "Piccolo" HF
> RTTY network.
>
> I have acquired one of these & am trying to get it working.
> It accepts a 10MHz (or 1 or 5) reference & the output can be set to
> any frequency between 3MHz & 29,999,900Hz, in 100Hz steps.
>
> My unit is showing a "Fault" LED on the display, which I believe is
> inhibiting the output. I can see a varying frequency at the o/p
> socket, but only a few mV, not the 1v into 50R as is normal.
>
> I suspect that the fault indication is because there's nothing
> plugged
> into either the "Keying Frequency Control Input" nor the "Carrier
> Frequency Control Input" sockets. (There's also a "V.F. Inputs" &
> "Carrier Output (BCD)" sockets.)
>
> Can anyone help with a manual or connection details for the 2 input
> sockets, please?
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