XTL choice for 137Hz w/ CD4046

Right - but you still gotta try barbecued pizza. You won't believe how good it is until you try it.

For size, drive north up 684 to exit 6, Golden's Bridge. Turn right, enter shopping center on the right & get a slice at the pizza place (whose name I forget) there. Biggest slices I've ever seen.

Ed

At this point I have a 20 yard commute, and my office is 15 feet from the fridge. Extra-large pizza slices, I do _not_ need. ;)

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal
ElectroOptical Innovations
55 Orchard Rd
Briarcliff Manor NY 10510
845-480-2058
hobbs at electrooptical dot net
http://electrooptical.net

Who makes crystals at 137 hz? The lowest I've seen was 19 KHz for a stereo generator and it wasn't cheap, because of the size. The crystal can was about two inches long.

--
Greed is the root of all eBay.

This is a list of frequencies available from the Digikey website:

20.000 kHz 25.600 kHz 26.667 kHz 28.000 kHz 30.000 kHz 30.720 kHz 30.760 kHz 31.200 kHz 31.250 kHz 31.500 kHz 32.000 kHz 32.560 kHz 32.768 kHz 32.919 kHz 34.000 kHz 36.000 kHz 38.000 kHz 38.400 kHz 39.500 kHz 40.000 kHz 44.100 kHz 46.604 kHz 46.6084kHz 50.000 kHz 59.787 kHz 60.000 kHz 60.002 kHz 60.005 kHz 65.535 kHz 65.536 kHz 69.000 kHz 70.000 kHz 71.000 kHz 72.000 kHz 73.000 kHz 74.000 kHz 74.300 kHz 74.400 kHz 75.000 kHz 76.000 kHz 76.790 kHz 76.800 kHz 76.810 kHz 77.000 kHz 77.204 kHz 77.287 kHz 77.500 kHz 77.503 kHz 77.504 kHz 78.000 kHz 79.000 kHz 83.000 kHz 96.000 kHz 96.006 kHz 100.000 kHz

111.000 kHz

117.720 kHz 120.000 kHz 120.8475kHz 125.000 kHz

131.072 kHz

149.475 kHz 153.600 kHz 200.000 kHz 307.200 kHz

1.000000 MHz 1.843200 MHz 2.000000 MHz 2.048000 MHz 2.097152 MHz

2.457600 MHz 2.500000 MHz 2.560000 MHz 2.949120 MHz 3.000000 MHz

3.072000 MHz 3.276000 MHz 3.276800 MHz 3.579000 MHz 3.579545 MHz

3.640000 MHz 3.686400 MHz 3.700000 MHz 3.859000 MHz 3.932160 MHz

4.000000 MHz 4.032000 MHz 4.096000 MHz 4.096250 MHz 4.194000 MHz

4.194304 MHz 4.332000 MHz 4.433000 MHz 4.433616 MHz 4.433618 MHz

4.433619 MHz 4.500000 MHz 4.645300 MHZ 4.746870 MHz 4.800000 MHz

4.897000 MHz 4.906250 MHz 4.915000 MHz 4.915200 MHz 5.000000 MHz

5.068800 MHz 5.120000 MHz 5.185000 MHz 5.223438 MHz 5.500000 MHz

5.529600 MHz 5.848400 MHz 5.926500 MHz 5.990400 MHz 6.000000 MHz

6.144000 MHz 6.176000 MHz 6.400000 MHz 6.498300 MHz 6.500000 MHz

6.553600 MHz 6.612813 MHz 6.745800 MHz 6.757000 MHz 6.764380 MHz

7.150500 MHz 7.159090 MHz 7.200000 MHz 7.372800 MHz 7.680000 MHz

7.948880 MHz 8.000000 MHz 8.000156 MHz 8.192000 MHz 8.388608 MHz

8.432000 MHz 8.500000 MHz 8.643200 MHz 8.912000 MHz 9.000000 MHz

9.216000 MHz 9.494531 MHz 9.509375 MHz 9.545000 MHz 9.600000 MHz

9.625000 MHZ 9.794100 MHz 9.815630 MHz 9.830000 MHz 9.830400 MHz

9.843750 MHz 9.843800 MHz 10.000000 MHz 10.240000 MHz 10.245000 MHz

10.624400 MHz 10.738635 MHz 10.738650 MHz 10.781250 MHz 11.000000 MHz

11.046000 MHz 11.059200 MHz 11.228000 MHz 11.289600 MHz 11.520000 MHz

11.981350 MHz 12.000000 MHz 12.000393 MHz 12.031125 MHz 12.096000 MHz

12.187000 MHz 12.187500 MHz 12.288000 MHz 12.352000 MHz 12.500000 MHz

12.688000 MHz 12.800000 MHz 12.960000 MHz 13.000000 MHz 13.025190 MHz

13.062500 MHz 13.125225 MHz 13.225000 MHz 13.225600 MHz 13.225625 MHz

13.262250 MHz 13.491600 MHz 13.500000 MHz 13.516800 MHz 13.521270 MHz

13.548560 MHz 13.560000 MHz 13.560000 MHz 13.605000 MHz 13.824000 MHz

13.949160 MHz 14.000000 MHz 14.089190 MHz 14.276430 MHz 14.299830 MHz

14.318000 MHz 14.318180 MHz 14.335900 MHz 14.359400 MHz 14.400000 MHz

14.463660 MHz 14.500000 MHz 14.690000 MHz 14.745600 MHz 14.822520 MHz

14.850000 MHz 15.000000 MHz 15.360000 MHz 16.000000 MHz 16.000312 MHz

16.128000 MHz 16.257000 MHz 16.367600 MHz 16.368000 MHz 16.384000 MHz

16.576000 MHz 16.666000 MHz 16.667000 MHz 16.670000 MHz 16.800000 MHz

16.934000 MHz 16.934400 MHz 17.734400 MHz 17.734475 MHz 18.000000 MHz

18.080000 MHz 18.432000 MHz 18.869000 MHz 19.200000 MHz 19.440000 MHz

19.657812 MHz 19.660000 MHz 19.660800 MHz 19.680000 MHz 19.800000 MHz

20.000000 MHz 20.356250 MHz 20.356300 MHz 20.480000 MHz 21.477270 MHz

22.000000 MHz 22.118000 MHz 22.118400 MHz 22.400000 MHz 22.500000 MHz

22.579200 MHz 22.627800 MHz 23.000000 MHz 23.264300 MHz 23.500000 MHz

23.512200 MHz 23.592000 MHz 23.706250 MHz 24.000000 MHz 24.000140 MHz

24.500000 MHz 24.545454 MHz 24.553500 MHz 24.576000 MHz 24.704000 MHz

24.745600 MHz 25.000000 MHz 25.175000 MHz 25.223500 MHz 25.456250 MHz

25.456300 MHz 25.500000 MHz 26.000000 MHz 26.451250 MHz 26.451300 MHz

26.500000 MHz 26.597100 MHz 26.800000 MHz 27.000000 MHz 27.120000 MHz

27.134375 MHz 27.134400 MHz 27.200000 MHz 27.306700 MHz 27.468800 MHz

28.000000 MHz 28.224000 MHz 28.259375 MHz 28.259400 MHz 28.322000 MHz

28.375000 MHz 28.593750 MHz 28.593800 MHz 28.636000 MHz 28.636300 MHz

28.636360 MHz 29.491200 MHz 29.498928 MHz 29.500000 MHz 30.000000 MHz

32.000000 MHz 32.514000 MHz 32.768000 MHz 33.000000 MHz 33.333000 MHz

33.333300 MHz 33.868800 MHz 35.251200 MHz 35.328000 MHz 36.000000 MHz

38.000000 MHz 38.000530 MHz 38.400000 MHz 38.880000 MHz 39.000000 MHz

40.000000 MHz 40.320000 MHz 40.960000 MHz 42.000000 MHz 44.000000 MHz

44.236800 MHz 44.545000 MHz 44.736000 MHz 44.800000 MHz 44.900000 MHz

45.000000 MHz 46.000000 MHz 48.000000 MHz 49.152000 MHz 49.860000 MHz

50.000000 MHz 53.125000 MHz 54.000000 MHz 55.000000 MHz 60.000000 MHz

64.000000 MHz 66.000000 MHz 66.666000 MHz 66.666600 MHz 73.669790 MHz

75.957292 MHz 76.121875 MHz 80.000000 MHz 114.285000 MHz 161.132800 MHz

--
Greed is the root of all eBay.

^^^^ Aarghhh... 3906

JF

A 100 KHz crystal is only 10 cycles off. 730*137=100,010 Hz. You should be able to pull the crystal 10 Hz.

--
Greed is the root of all eBay.

137 * 512 = 70.144k

an error of .2 percent. You should be able to trim that out

I work at home too. The bedroom door is 10 ft away, and since today is a holiday, my wife - a junior officer in government service - is home and whatever I need from the kitchen is just a yell away. :-)

My workshop, 10 yards from the main building, is almost completely taken over by accumulated junk - unclaimed TVs, VCRs, etc from my repairing days, old computers from more recent times, old projects, even a complete X-ray machine. We don't have proper disposal and recycling facilities, and I've never yet got around to hiring a truck to take everything to a designated dumping ground 20 km outside town.

Hmmm, at that rate I'll subcontract you all my programming work...

--
Thanks,
Fred.

--
Since:


     70000 Hz
    ---------- = 136.718 Hz
       512

which is on the low side of 137Hz by a couple of thousand ppm, that's
unlikely.

JF

Oh yeah! The only way to really do pizza.

[...]

--
Regards, Joerg

http://www.analogconsultants.com/

"gmail" domain blocked because of excessive spam.
Use another domain or send PM.

0.1% is often ok but 0.2% gets iffy, especially with a low frequency crystal.

Now Don could do what we used to do when I was a teenager. Get a few army surplus FT-crystals. They have a lid held by Philips screws so you can take the crystal out and polish it up in frequency :-)

--
Regards, Joerg

http://www.analogconsultants.com/

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Use another domain or send PM.

Have you tried to find any of those in the last 20 years? They have been obsolete for 60 years, and have been hard to find for 20 years.

--
Greed is the root of all eBay.

That would be no problem, Sir:

--
Regards, Joerg

http://www.analogconsultants.com/

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Use another domain or send PM.

Kind of high frequency for the input of a 4060 divider, isn't it? Nine crystals? You might be surprised at how high the price will go, since the boat anchor ham radio types will usually pay a high price for them, now that there aren't millions of fresh surplus for 10 cents each. A lot of them are defective, as well since they are not hermetically sealed. that causes the activity to be low, which requires more drive that can destroy the crystal. FT243 crystals were crude, at best and time hasn't been kind to them. Others have been dropped and the quartz is fractured.

Like I said in another post, a common 100 KHz crystal is only 10 cycles low, for a divisor of 730.

137*730=100,010 Hz which is a .01% error. Digikey has new 100 KHz crystals for 83 cents each.

--
Greed is the root of all eBay.

[...]

No, 2-Meter refers to the kind of radio they were used in. Enlarge the image and you'll see that they are all slightly above 8MHz. Or 8000 kilocycles in old army-speak :-)

Usually not. Watch a few auctions, many remain at zero bids for a long time or find no takers.

Well, that's the case with all old stuff. As long as the contacts are not too corroded you can usually restore.

Well, yeah, but Don wanted to use just a CD4060, for whatever reason. I think a uC is the proper way to handle this.

--
Regards, Joerg

http://www.analogconsultants.com/

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Use another domain or send PM.

I know what the multiplier chain for an old 2-meter rig looked like. I serviced them for 30+ years, and still have a Harris business radio that was converted to 2 Meters to monitor the local repeaters. I was talking about the fact that the older CMOS ICs used more power at higher frequencies. National lists 8 MHz as close to the upper limit for their

4060s. Watches use 32,768 Hz crystals to conserve power, after all.

Only if they are of no use for any ham application.

It'll usually do 12MHz when supplied with 15V. National? Now that's a blast from the past :-)

They usually aren't. Hams have moved into the 21st century and use synthesizers :-)

These days such crystals are usually bought by collectors, restorers or hardcore homebrewers.

[...]

--
Regards, Joerg

http://www.analogconsultants.com/

"gmail" domain blocked because of excessive spam.
Use another domain or send PM.

[snip] [snip]

My first home-brew 2-meter transmitter used a power varactor tripler :-) ...Jim Thompson

-- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at

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