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Total 3 documents matching your query.

1. Re: LF: 137kHz transmitters (score: 1): Author: Andy Talbot <[email protected]>; Date: Fri, 25 Jun 2010 18:36:47 +0100; A pair of old fashioned 74xx161 devices (inverter needed, too) Hardwire a preset loaded values of (256 - N), it counts up from that and reloads the preset value when the count rolls over from 255; /rsgb_lf_group-archives/html/rsgb_lf_group/2010-06/msg00239.html (11,038 bytes)
2. Re: LF: 137kHz transmitters (score: 1): Author: Andy Talbot <[email protected]>; Date: Fri, 25 Jun 2010 23:11:00 +0100; A circuit diagram of the divider using a pair of 74xx161 devices can be seen in the top left of www.g4jnt.com/UWLOLCK2.GIF But as others have pointed out, you'll probably need a 50% duty cycle s; /rsgb_lf_group-archives/html/rsgb_lf_group/2010-06/msg00428.html (12,272 bytes)
3. LF: 137kHz transmitters (score: 1): Author: Roger Lapthorn <[email protected]>; Date: Fri, 25 Jun 2010 18:29:38 +0100; 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 -- http://g3xbm-qrp.bl; /rsgb_lf_group-archives/html/rsgb_lf_group/2010-06/msg00469.html (9,701 bytes)

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