[time-nuts] Re Frequency counters

[Stephen Farthing]

Hi guys,

A little research has revealed :-

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=150444654388&_trksid=p2759.l1259#ht_1131wt_783

which
points to a guy selling a PIC based module which is clocked at 10 Mhz. I
guess it should be possible to take the crystal out and clock it from the Rb
standard. I have asked him a couple of questions about the module and will
report back.

and

http://homepage.eircom.net/~ei9gq/counter.html

also a pic based design.

I would really love one of the HP counters but they are expensive over here.
If I make Dayton next year I will see if I can get one at the fleamarket.

72/3 de Steve G0XAR

-- 
It is vain to do with more that which can be done with less.
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[time-nuts] Re frequency counters

[Stephen Farthing]

Guys,

My needs are pretty simple, i need to put the output frequency of my qrss
beacons into a 100 hz sub band within my chosen band of operation - mostly
30 meters. The beacon puts out a morse id in the form of a 4 Hz square wave
with a dot length of 3 secs or more. With a calibrated frequency counter
accurate to 1 Hz this is a breeze. So a simple eyeball check is ok...though
a simple logging capability would be handy so I can   see how the output
frequency varies with temperature. I am pretty sure I can do it all with a
simple microcontroller and an LCD display plus a prescaler. Time to break
out the Arduino..and cut some code...

FWIW QRSS is a weak signal mode, it is possible for signals < 100 mW to be
received  globally. My beacon uses a mere 3 transistors and a crystal plus a
handful of passive components. It puts out 100 mW.

72/3 de Steve g0xar

-- 
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Re: [time-nuts] Re frequency counters

[Joop]

>It is vain to do with more that which can be done with less.

In that case have a look here:

http://www.uploadarchief.net/files/download/freqlogger.zip

A PIC12F629 based RS-232 frequency logger.
No display and can be clocked by an external 10MHz clock if needed. My
version worked to 60 MHz.

Joop

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