KitsAndParts.Com Forum

W8DIZ · 2008-08-12 14:35:33

Build this Frequency Standard/Reference Kit for $12.

http://kitsandparts.com/fref.php

-Diz, W8DIZ

W4GNS · 2008-12-16 14:22:15

W8DIZ Freq Standard in action http://www.w4gns.com/DIZ_Freq_Standard.html

kc0wox · 2008-12-16 17:21:20

Looks a lot like the picture was taken in the "Rolling Electronics Lab".

I didn't know AADE made a frequency counter. It's a lot more portable than my HP counter.
Leonard

kc0wox · 2008-12-16 17:25:58

Hey Diz!
I didn't see the quarter and the Altoids box listed in the parts list. Is that an option?

Next order I make, I'll order one even though I don't need it. I just like building your kits.
Leonard

W4GNS · 2008-12-16 17:32:12

Yes they do,and its handy and VERY portable, it will easily fit in a coat pocket, and the lab is not doing much rollin', there is foul weather in WA/OR and I'm not allowed to travel on slick roads, so I'm getting alot done with my projects.

kc0wox wrote:
Looks a lot like the picture was taken in the "Rolling Electronics Lab".

I didn't know AADE made a frequency counter. It's a lot more portable than my HP counter.
Leonard

w8iff · 2008-12-17 16:51:35

I got the ideal calibration systen.
Ya build the W8DIZ frequency counter and calibrate it against the W8DIZ frequency standard that was calibrated with the W8DIZ frequency counter.
It's spot on every time.

wd73383 · 2010-03-11 23:52:08

The specifications on this frequency standard are pretty minimal. Here are some questions:

1. Is the 3 Vp-p output mentioned in the build-sheet with or without a load?

2. What is the load impedance? The output drops to maybe 1 Vp-p with 50 ohm load.

3. What should the output waveform look like? Since it comes almost directly off the counter output, I was expecting something like a square wave, but it's not.

4. Does anyone have the part number for a 10-turn frequency adjust pot that will fit the PCB?

5. A low-pass filter would be nice on the output to clean up the waveform (not a question, just a comment).

W8DIZ · 2010-03-12 07:30:22

wd73383 wrote:
The specifications on this frequency standard are pretty minimal. Here are some questions:
1. Is the 3 Vp-p output mentioned in the build-sheet with or without a load?
2. What is the load impedance? The output drops to maybe 1 Vp-p with 50 ohm load.
3. What should the output waveform look like? Since it comes almost directly off the counter output, I was expecting something like a square wave, but it's not.
4. Does anyone have the part number for a 10-turn frequency adjust pot that will fit the PCB?
5. A low-pass filter would be nice on the output to clean up the waveform (not a question, just a comment).

1. no load.
2. not specified, but most most likely near the collector load resistance of 500 ohms.
3. very ugly; not concerned about the looks; just wanted to bufffer the output from the CMOS IC.
4. see mouser.com or your favorite electronic house.
5. if you must. but not required for intended application.
6. this cheap $12 kit was designed to be used as a reference only to calibrate other devices.
7. Rhubidium standards with a nice clean square wave output at 50 ohms are available on ebay, but not for $12.
8. above comments written before drinking coffee this morning.

88, Diz, W8DIZ

KitsAndParts.Com Forum

#1 2008-08-12 14:35:33

Frequency Standard/Reference Kit

#2 2008-12-16 14:22:15

Re: Frequency Standard/Reference Kit

#3 2008-12-16 17:21:20

Re: Frequency Standard/Reference Kit

#4 2008-12-16 17:25:58

Re: Frequency Standard/Reference Kit

#5 2008-12-16 17:32:12

Re: Frequency Standard/Reference Kit

kc0wox wrote:

#6 2008-12-17 16:51:35

Re: Frequency Standard/Reference Kit

#7 2010-03-11 23:52:08

Re: Frequency Standard/Reference Kit

#8 2010-03-12 07:30:22

Re: Frequency Standard/Reference Kit

wd73383 wrote:

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