Calibrating one 1 ppm TCXO against another 1 ppm TCXO calibrator (for
those with the optional extra K3 KTCXO3-1) would not be a good idea. In
any event the calibrator is going to drift with time and need
calibrating itself every year or so.
G4JNT published a 60 KHz off air frequency standard
GB3RAL at 50.05MHz should be a good signal in Warfield. I do not know how
accurate it is, it is well beyond my ability to measure it here at home. The
reference it is driven from is locked to GPS with a long time constant and
should be close to one part in 10^10. However, the frequency is DDS
Thanks Trevor, but of course, I wanted something now, and not when I've
built it :(
And I have the 1ppm TCXO, so when firmware permits me to enter the offsets
from its calibration sheet, I'll be all set.
And Elecraft make the XG1 and XG2 kits too.
On 12/1/08 23:47, Trevor Smithers [EMAIL
David Ferrington, M0XDF wrote:
I'd like to get a list of KNOWN frequencies of broadcast stations in 10 -
40m in the UK - it's been pointed out tpo me that using BBC WS at 648 KHz is
a not so good, because its a low freq.
The World Service is on on multiple HF frequencies and there are also
Ian wrote:
The higher the reference frequency, the more accurately you can set the
TCXO
---
Is that correct? I don't know the details of Wayne's firmware, but the
accuracy of a synthesized rig is normally independent of the frequency being
received.
I go for the highest
Ron D'Eau Claire wrote:
Ian wrote:
The higher the reference frequency, the more accurately you can set the
TCXO
---
Is that correct? I don't know the details of Wayne's firmware, but the
accuracy of a synthesized rig is normally independent of the frequency being
received.
Let me ask this again.
Are you saying, that since the mixer signal is a multiple of the TCXO
freq that any errors in the TCXO will be magnified as the ref signal
goes higher in frequency. This will then magnify the difference in
audio note of (say) 10 MHz vs 20 MHz for the same TCXO setting. A
W5FTD wrote:
Let me ask this again.
Are you saying, that since the mixer signal is a multiple of the TCXO
freq
Multiple isn't quite the right word, but every synthesized signal in
the box is directly proportional to the TXCO frequency. If the TCXO is 1
ppm high, for example, then all
I'd like to get a list of KNOWN frequencies of broadcast stations in 10 -
40m in the UK - it's been pointed out tpo me that using BBC WS at 648 KHz is
a not so good, because its a low freq.
I seem to be having problems find a broadcast that is reliable and from the
UK.
--
I think computer
M0XDF wrote:
I'd like to get a list of KNOWN frequencies of broadcast stations in 10 -
40m in the UK - it's been pointed out tpo me that using BBC WS at 648 KHz
is
a not so good, because its a low freq.
David
(by the way, you can now delete the 'Waiting for K3' from your
Thank you Dave, as always, your response is invaluable.
Yes, I was finding it hard to determine what to listen to and was concerned
about accuracy - I used 7200.
Good luck in AFS CW tomorrow.
On 12/1/08 19:06, G3YMC [EMAIL PROTECTED] sent:
M0XDF wrote:
I'd like to get a list of
Trevor,
I would tend to believe that the carrier frequency of a broadcast
station would be better accuracy than that 'fairly accurate' 10 MHz
secondary frequency standard.
That being said - use a secondary standard if that is your only choice
and if you trust it. Your K3 calibration will
http://www.aade.com/freqstd/freqstd.html
I can second that item...
I bought one several years ago, I calibrated mine to less than 0.1 cps at
10MHz. Using a 9V battery and a 5 minute warm-up, it has maintained its
calibration to date.
There is a multi-turn pot on the PCB for fine tuning
-
Dave
Thanks Geoff:
The higher the frequency of the signal you use as your 'standard' the more
accurate your REF CAL adjustment will be.
If you can use WWV / WWVH, try to use it, and at the HIGHEST frequency at
which you can hear it... 20MHz if possible, then 15 MHz, and lastly 10 MHz
if the higher
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