... I did consider generating 3 resistor combinations. The program shouldn't be that much more complex (in essence, just another inner loop, to run on every ...
A scope is not accurate enough. Counters were high end instruments at the time this calibrator was designed. The normal way of calibrating these oscillator was...
When I was in the Navy ,many years ago the cal lab would use an o"scope to compaire two time bases to each other. One would go into the vertical input and...
. Ah Yes,,the good old days...before FREQ.counters... . LISSAJOUS figures.. by far more accurate than freq counter for compairing differnt freqs.. . ...
Yes...very accurate...in fact one could insert a given known frequency (WWV) on one axis, then inject the frequency of the crystal calibrator on the other...
To do it with a scope you have to have a known accurate frequency standard. WWV is the most common standard available to hams in the old days. If you have a...
Is the HRA-10 being used in a ham radio? If so you can look for one of the beacons on 14.100 if you can find one. Then you can zero beat the HRA-10 against...
11503
Mike McCarty
Mike.McCarty@...
Jul 2, 2009 6:39 am
... Even today, you'd need a _good_ frequency counter for it to be used to calibrate a crystal, not a junky one with just a crystal in it as a standard. ... ...
Leo, No, the GD-973A won't control a DC motor. It's for AC devices only. The reason being that when the SCR turns on, the motor will run at full speed until...
Greetings to the group, If you have either of the above please contact me both on and off the group as I have email trouble and sometimes loose my email. Thank...
Hey Doc, I see you touting ebay. Are you now a spokes person for ebay. I have never heard anyone defend ebay with such rigor ? You hamfest buddy, George...
Touting? Read more closely - I was suggesting an alternative. Someone else was touting it. ... Thanks! & 73, doc, KD4E FS/Swap/Wanted:...
11513
Mike McCarty
Mike.McCarty@...
Jul 2, 2009 6:45 pm
... It might. Possibly. As has been pointed out, you need to run the circuit on AC, so the control element has a chance to turn off. If the control element (I...
My HRA=10-1 is in the Heathkit HR-10B. It is 80M, 40M, 20M,15M and 10M hambands only receiver. So how do you use WWV to calibrate it? Actually, I need the...
The calibrator is only an oscillator, and puts out an rf signal at one freq., but you know not where. You must have a receiver capable of 5,10,15 MHZ or freq....
A full HRA-10 manual has been sent. It explains how to adjust the calibrator using a GC Rx tuned to WWV! Bob Macklin K5MYJ Kent (Seattle), Wa, "Real Radios...
They would be fun... has it been spoken for yet? --... ...-- Dale - WC7S in Wy To: heathkit@yahoogroups.com From: unclegeorgessurplus@... Date: Thu, 2...
Remember too - CHU's 40 meter band transmission moved from 7335 kHz to 7850 kHz on Jan. 1, 2009 Regards, Bill Bowen Sacramento, CA "Richard W. Solomon"...
11521
Mike McCarty
Mike.McCarty@...
Jul 3, 2009 5:24 am
... Plan 1: Use a BCB receiver, and zero beat against a known frequency local station. The higher the frequency the better. It'll need to be one with a...
Think they moved up to around 7.8mHz. ... From: Richard W. Solomon <w1ksz@...> Subject: Re: [Heathkit:Yahoo] HRA-!0-1 Crystal Calibrator Instructions...
11523
Mike McCarty
Mike.McCarty@...
Jul 3, 2009 5:26 am
... Note that the common garden variety frequency counter is no better than the calibrator, likely, unless _it_ has been zero beat with WWV first. Your plan is...
11524
Mike McCarty
Mike.McCarty@...
Jul 3, 2009 5:28 am
... CHU does not operate on a frequency which can be used to calibrate this oscillator. Mike -- ...
