[Collins] WARC XTALS for KWM-2A

[appo2 at juno.com]

I have never seen any article here,,,,about PLL or DSS for Collins.
I hope if you bought some and tried it with S-line,,,gives us reports,
JA1AOR is a well known Collins freak!,,,AOR DDS unit for collins 
S line goes for big money in Epay.Does it worth it?
JG1XLV shows DDS kit for collins,,,,if he is in this thread,,I d like to
hear
from him.Must be way below JA1AOR unit.
We love collins s line,,,bcz it sounds good,,,,,thats all
K7FT


On Wed, 01 Aug 2012 21:40:14 -0500 "Dr. Gerald N. Johnson"
<geraldj at weather.net> writes:
> Yes, the easiest one probably is a DDS chip from Silicon Labs.
> The SI570 is one of those chips. According to an on line article 
> from 
> K5BCQ its rated for 10 to 160 but his does about 3 to 250 Mhz in 1 
> Hz 
> steps. Its been used with SDR like the Soft Rock and with coarser 
> programming in the controller chip could easily do a Collins local 
> oscillator. It might have more phase noise though which could be an 
> 
> impediment in a strong signal environment like Europe on 40 meters. 
> The 
> file I have on my other computer is titled "SI 570 kit from 
> K5BCQ.pdf". 
> He claims pretty good phase noise. Also I have saved a web page, 
> "Si570_Kit_from_K5BCQ.htm" He uses a simple shaft encoder and with 
> pushes on the encoder (a button) allows selecting the digit to be 
> changed and then changing only that digit so moving in 100kHz or 1 
> MHz 
> steps after setting in the 3.155 MHz offset would be fairly straight 
> 
> foward. No doubt a minor amount of software changes in the 
> controller 
> chip could allow the display to be direct reading in S-line lower 
> side 
> frequency range with maybe standard 50 or 100 kHz steps.
> 
> The kit was $40 and does include surface mount parts.
> 
> Its just one of many one chip synthesizers around these days.
> 
> Searching to find one I remembered I found:
> http://www.pongrance.com/super-dds.html
> 
> There was a commercial crystal replacement crystal synthesizer, 
> personified by:http://www.aade.com/About_PayPal.html#dfd2 at Almost 
> All 
> Digital Electronics made specifically for Collins.
> 
> That TTL logic circuit probably is still workable if Far Circuits 
> has a 
> PC board. 74HC CMOS will do the same exact functions as TTL a bit 
> faster 
> and with far less power consumption. But all the logic it took on 
> several square inches of board these days can be had in a 5 x 7 mm 
> kage, or maybe even smaller.
> 
> I have a crystal pack so with my extra crystal socket, I'm covered 
> though I like my FT-857D so well my S-line is rarely connected to 
> power.
> 
> 73, Jerry, K0CQ, Technical Adviser to the Collins Radio 
> Association.
> 
> 
> On 8/1/2012 3:40 PM, Dave Brown wrote:
> >   I'm reminded by these posts that there was a Colins S-line etc 
> crystal
> > replacement synthesiser article quite some years ago in Ham Radio- 
> has this
> > idea ever been updated? IIRC that article used basic 7400 series 
> TTL-I'd
> > expect there's a 'better mousetrap' around these days....
> >   73
> >   Dave, ZL3FJ
> >
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