Re: LF: RE: Simple, low cost, 8.970kHz stable source?

[Andy Talbot <andy.g4jnt@googlemail.com>]

Use a programmable divider for more obscure division ratios. 

September's RadCom has a generic design for 74HC161 type

 

Andy
www.g4jnt.com

On 26 October 2010 19:16, Roger Lapthorn <rogerlapthorn@gmail.com> wrote:

CB crystals.... thanks Rik (and others). This does sound like a sensible and low cost approach.

73s
Roger G3XBM

On 26 October 2010 19:03, Rik Strobbe <Rik.Strobbe@fys.kuleuven.be> wrote:

Roger,

 

an easy (and cheap way) might be CB crystals. Most are 3rd overtone in the range of 26965-27405kHz (= 8988-9135kHz xtal frequency). Divided by 1024 (eg. using a 74HC4060 as oscillator / divider) you get 8777-8921Hz.

 

73, Rik  ON7YD - OR7T

 

---

Van: owner-rsgb_lf_group@blacksheep.org [owner-rsgb_lf_group@blacksheep.org] namens Roger Lapthorn [rogerlapthorn@gmail.com]
Verzonden: dinsdag 26 oktober 2010 19:04
Aan: rsgb_lf_group@blacksheep.org
Onderwerp: LF: Simple, low cost, 8.970kHz stable source?

What do people think is the simplest, lowest cost, way of generating a stable 8.970kHz frequency that does not require a PC when running? I thought of an HF crystal divided down by 256 (from 2.296320MHz), but have you tried to buy a "made to order" crystal lately?

73
Roger G3XBM
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--
http://g3xbm-qrp.blogspot.com/
http://www.g3xbm.co.uk
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G3XBM   GQRP 1678    ISWL G11088