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LF: RE: 137kHz transmitters

from [Rik Strobbe] [Permanent Link][Original]
To: "[email protected]" <[email protected]>
Subject: LF: RE: 137kHz transmitters
From: Rik Strobbe <[email protected]>
Date: Fri, 25 Jun 2010 19:33:49 +0200
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Thread-topic: 137kHz transmitters
Roger,
 
if you want to end up with a 50% duty cycle signal you need to divide by 13 and then divide by 2.
Divide by 13 can be done using a presetable 4 bit counter such as 74HC160 (http://www.datasheetcatalog.org/datasheet/philips/74hc160.pdf).
 
73, Rik ON7YD - OR7T
 
Van: [email protected] [[email protected]] namens Roger Lapthorn [[email protected]]
Verzonden: vrijdag 25 juni 2010 19:29
Aan: [email protected]
Onderwerp: LF: 137kHz transmitters

3560 and 3579kHz, both cheap crystals, divided by 26, give CW and QRSS frequencies on 136/137kHz. What is the simplest and cheapest way of getting divide by 26?

73s
Roger G3XBM

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