John Ackermann N8UR wrote:
> IIRC, the 3586 wants a sine wave reference, and gets fairly unhappy if
> it doesn't see one.
>
> Of course, another option is to stick a low pass filter following the 10
> MHz square wave; knock off the odd harmonics, and you'll have a sine
> wave again.
>
> John
>
>
>
The best phase noise and phase shift stability will be achieved by not
using a bandpass filter to extract the 10MHz signal, but by using a low
pass filter with low phase shift at 10MHz to eliminate the higher
harmonics, supplemented with high Q series tuned traps at the
fundamental (5MHz) and 5th h
James R. Gorr said the following on 01/19/2008 07:41 PM:
> What I am trying to accomplish is provide a reference
> for my HP 3586C. I want to try my hand at the FMT in
> February.
>
> I have a set of the Lucent RFTG-m-XO and RFTG-m-RB.
>
> My options are use the RB as stand alone or use the XO
>
Bruce Griffiths wrote:
>> Dividing by 3 and then multiplying by 2 is not necessary, it just adds
>> complexity and noise.
>>
>> Just use a pair of JK flipflops (no external gates required to divide by
>> 3 unlike when using D flipflops) configured to divide by 3 and extract
>> the 10MHz component i
> Dividing by 3 and then multiplying by 2 is not necessary, it just adds
> complexity and noise.
>
> Just use a pair of JK flipflops (no external gates required to divide by
> 3 unlike when using D flipflops) configured to divide by 3 and extract
> the 10MHz component in the divider output.
> For
James R. Gorr wrote:
> What I am trying to accomplish is provide a reference
> for my HP 3586C. I want to try my hand at the FMT in
> February.
>
> I have a set of the Lucent RFTG-m-XO and RFTG-m-RB.
>
> My options are use the RB as stand alone or use the XO
> with the GPS, or combine the two. (I
What I am trying to accomplish is provide a reference
for my HP 3586C. I want to try my hand at the FMT in
February.
I have a set of the Lucent RFTG-m-XO and RFTG-m-RB.
My options are use the RB as stand alone or use the XO
with the GPS, or combine the two. (I believe I have
the "matched set"
Bruce Griffiths said the following on 01/19/2008 05:20 PM:
> James R. Gorr wrote:
>> I always assumed frequency references should be sine
>> waves. If that is not the case, I guess I can use
>> this for a reference for other equipment? And if a
>> square wave is just fine, could I use a clock-blo
James R. Gorr wrote:
> I always assumed frequency references should be sine
> waves. If that is not the case, I guess I can use
> this for a reference for other equipment? And if a
> square wave is just fine, could I use a clock-block to
> divide the 15 MHz of the XO down to 10 MHz?
If you ever
When the input to the phase detector consists of the OCXO signal plus
another frequency offset from the first i.e.
Vi(t) = A1*cos( w1*t) + A2*cos(w2*t)
Where w1 = 2*PI*(OCXO frequency)
the observed signal at the output of the phase detector is:
Vo(t) = Vi(t)*sin(w1*t)
Vo(t) = A1*cos(w1*t)*sin(w
> If not, what other alternatives are there to get 10 MHz out the the 15
> MHz?
There is a 10 MHz sine wave coming out of the LPRO inside.
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My scope was set for 2 volts / div, terminated right
in to the scope. Arguably not the best way to view
it...
Here is another photo, terminated with 50 Ohms and
amplitude set at 1 volt per division. I guess it
looks a lot cleaner. Not sure what the impedance is
supposed to be.
I always assume
James,
Not played with one of these units, but looks like a very useable 10 MHz
square wave. What impedance are you terminating with? What is the amplitude
scale on the 'scope?
Rob Kimberley
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of James R. Gorr
Attached is a photo of the output of my RFTG-m-RB J2
(10 MHz REF OUT). Is this the expected shape? J4 (15
MHz OUT) is a nice clean sine wave. Can I safely use
this 10 MHz signal as a reference for other gear that
takes a 10 MHz input?
Thanks in advance!
Jamie
Hi Brooke,
The transmitter coordinates are
62 deg 23.5 min North Latitude
145 deg 8.8 min West Longitude
or 8 mi north of Gakona, Alaska
in case you were interested.
Richard
> Hi:
>
> This is not a frequency measuring test.
> I wonder if there would be doppler on the return signal.
> The tran
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