[Lowfer] 1750 meter frequency for Part 5?

[Paul Daulton]

  use clock osc instead of xtals. I have about 2hz drift on my beacon, not good but tolerable, with microprocessor xtal and 4060 chip 6.0mhz/32 . beacon tx is at base of tower in plastic box with no temp compensation. next version will be split and duplex rf and dc out to the finals via underground coax with osc /divider in controlled environment. 

  two ne602 rec built as bench model had similar drift but it was in temp controlled environment. 

  clock oscs and sbl or 4053 analog switch mixer would be best approach for stability. 

Quoting Bill Ashlock :
"KISS is important thing. Keep it simple.... "

Hi Paul,

Have you checked on the frequency stability of your approach? I've got to hit the hay or I would do it. My sense is that it has approx 28 times more drift than the std divided-down approach (assuming similar stabilities in all microprocessor xtals). I'll work out the math tomorrow and get back to you. 

Bill

> Date: Fri, 30 Oct 2009 05:40:44 +0000
> From: k5wms at centurytel.net
> To: lowfer at mailman.qth.net
> Subject: Re: [Lowfer] 1750 meter frequency for Part 5?
> 
> One can also use two ne602 one for osc at 5.0mhz as a bal mod and 
> another for mixer at 5.185mhz to get to 185khz. Then warp one to get 
> right on 185.3. Or just 5.0osc driving mixer with 5.185. 
> 
> KISS is important thing. Keep it simple.... 
> 
> Quoting Bill Ashlock :
> >
> > "Some commonly available crystal that can be used with a 4060 
> > oscillator/divider
> > would make it a lot easier. Otherwise you get
> > faced with either having to order a custom oscillator or crystal or going the
> > DSS route"
> >
> > Not totally true Jim. All one has to do is use a common 5.188 microprocessor
> > Xtal in a four component oscillator circuit (probably more stable than the
> > 4060's oscillator)and then divide by 14 and 2 using two std divider chips. At
> > least that's what I do. Far more important is whether or not 187.5 is a good
> > area of the band for Lowfering, from a lack of interference standpoint. 
> >
> > Bill
> >
> > > From: w4jbm at bellsouth.net
> > > To: k5wms at centurytel.net; lowfer at mailman.qth.net
> > > Date: Thu, 29 Oct 2009 03:28:59 -0400
> > > Subject: Re: [Lowfer] 1750 meter frequency for Part 5?
> > >
> > > > What ever watering hole we pick lets keep in mind the attraction to
> > > > newcomers of a simple way to get on. 
> > >
> > > I have to agree with that. Some commonly available crystal that can be used
> > > with a 4060 oscillator/divider would make it a lot easier. 
> > Otherwise you get
> > > faced with either having to order a custom oscillator or crystal or 
> > going the
> > > DSS route. To me that changes it from a "simple weekend project". 
> > >
> > > It would also make it very reasonable for someone to "kit up" the crystal,
> > > 4060, and a couple of pairs of transistors. I've got a PIC programmer and
> > > could program the K1EL K8 chip or the PICBeacon (that's the one I use) for
> > > anyone who needed it. Or you can order a K12 very reasonably. Or 
> > you can just
> > > use a 555 chip and build a dasher with some unique dash length. 
> > >
> > > I like the idea of a watering hole, but it's just such an offbeat 
> > frequency to
> > > get to with off the shelf parts. I remember when I first started looking at
> > > building a beacon I kept doing the math just certain that the watering hole
> > > had to come from some common combination of readily available crystal and
> > > common divider. 
> > >
> > > I should have my DSS going soon and it will be a moot point. But I do think
> > > it's a "barrier to entry" for people interested in building a beacon. 
> > >
> > > If you look at the interest in building simple QRP rigs, there's really no
> > > reason to think that there shouldn't be more interest in Part 15. 
> > But there's
> > > got to be some critical mass of 1) xmitters and 2) grabbers. 
> > >
> > > 73 de
> > > Jim W4JBM
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> 
> Paul Daulton K5WMS
> beacon WMS 187.492 khz qrss30/slow 24/7
> Jacksonville,Ar 72076
> em34wu
> 
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Paul Daulton K5WMS
beacon WMS 187.492 khz qrss30/slow 24/7
Jacksonville,Ar 72076
em34wu