SB-650

[Robert Myers]

Jim,

I did some mods to an SB-650 that at the flip of a single switch (on the back) 
converted it to a frequency counter to 1 Hz resolution, or back to a "regular" 
SB-650.

It's not quite as straight forward as it seems as it seems, because, in normal 
SB-650 state, it counts for only a portion of a second:  up, down, then up 
(depends on whether it counting the HFO, LMO, or BFO.  (and divides by 25 or 100 
etc., along the way).  Then latches and displays, and it does this more than 
once a second of course.  (Sorry,  I'm going from memory on a mod I did 25 years 
ago.)

With the mod I did it could only update once per second of course.  I have it 
written down somewhere --- may not be exactly what you want, but there are a 
couple neat tricks in it which might help.

-- Rob Myers

----- Original Message ----- 
From: "James Montress" <W2JJM at WEBTV.NET>
To: <HEATH at LISTSERV.TEMPE.GOV>
Sent: Wednesday, June 15, 2005 4:34 PM
Subject: [HEATH-TEMPE] SB-650


>I am in need of the manual pages concerning Circuit description/theory
> of operation for the SB-650. I do not need the schematic. If some one
> has these pages and could copy them I would be    pleased to pay for the
> copies and postage. Back in the early 1990's I built the updated version
> from the January 1987    issue of Ham Radio Magazine with LED  digital
> display. A great addition to my   HW-101. I am now toying  with the
> possibility of adding 10 Hz resolution. Has anyone ever had the same
> thought and  been able to carry thru with it? Any and all responses
> would be appreciated.
> Jim W2JJM      Since 1936.      Tnx.
>
>
>
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Products bought, sold or traded here is the responsibility of the
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for losses or misrepresentations of any kind.  Buyer beware!

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This list is a public service of the City of Tempe, Arizona
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