On 05/25/11 07:39 PM, Chuck Forsberg WA7KGX N2469R wrote:
If the radio's clock can be trimmed with a voltage,
why not divide the radio's 20 MHz clock by two and
feed the result into the GPSDO in place of the GPSDO's
10 MHz oscillator.
It can not be trimmed via a voltage. Also, I'm not keen to
Hi
You also may want to avoid an oscillator with much 10 MHz content in it. All
sorts of odd things can happen with spurs when you have unplanned stuff on the
main reference. Another thing to look closely at is - how much of the radio
tracks the reference? On some radios, they don't really
On 27 May 2011 15:21, Bob Camp li...@rtty.us wrote:
Hi
You also may want to avoid an oscillator with much 10 MHz content in it. All
sorts of odd things can happen with spurs when you have unplanned stuff on
the main reference. Another thing to look closely at is - how much of the
radio
Imho phase noise is probably as important as long term stability in this
application.
On Fri May 27th, 2011 10:51 AM EDT David Kirkby wrote:
On 27 May 2011 15:21, Bob Camp li...@rtty.us wrote:
Hi
You also may want to avoid an oscillator with much 10 MHz content in it. All
sorts of odd
Hi
Looking at this in terms of time nut type stability - you really want to lock
the 20 MHz up to something like a TBolt. At that point you have a wire out the
back of the radio and all that implies. Keeping the ground loops and RF issues
at bay in a transmitter is not trivial. For a timing
On Fri, May 27, 2011 at 6:10 PM, Mark Spencer mspencer12...@yahoo.ca wrote:
Imho phase noise is probably as important as long term stability in this
application.
for real and serious amateur radio dxing it's much more important the
phase noise and IMD3 performance of the RX rather than
List,
How about the LM1496 IC DBM? Simple and cheap.
Regards,
Perrier
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Hi
As mentioned earlier, phase noise is critical. That would be the main issue.
The original suggestion of a diode rectifier doubler has a much lower noise
floor. Done from scratch they don't cost much at all.
Bob
On May 27, 2011, at 12:35 PM, Perry Sandeen wrote:
List,
How about the
Yep. But in this case the original poster was looking to improve stability.
Perhaps a better way to have phrased my comment would have been to ensure that
the phase noise is not degraded vs the original xtal oscilator. I do agree
though that phase noise is very important. As a side note I
I'm still trying to find a solution to replacing a standard crystal in a Kenwood
TS-940S transceiver with something more accurate. The transceiver uses a 20 MHz
crystal oscillator, though a 20 MHz TCXO was available as an option, though few
rigs appear to be fitted with it.
If one was to make
A trifilar transformer with two diodes is the simplest. You could also use a
mini-circuits doubler, same thing more expensive.
Alternatively take an SBL-1 and feed 2 inputs with the same 10Mhz and get a
doubled out. You will need to filter it a bit.
At 25-05-2011, you wrote:
If one was to
of precise time and frequency measurement time-nuts@febo.com
Sent: Wednesday, 25 May, 2011 8:52:12
Subject: [time-nuts] What's the best way to double 10 MHz to 20 MHz ?
I'm still trying to find a solution to replacing a standard crystal in a
Kenwood
TS-940S transceiver with something more accurate
If the radio's clock can be trimmed with a voltage,
why not divide the radio's 20 MHz clock by two and
feed the result into the GPSDO in place of the GPSDO's
10 MHz oscillator.
--
Chuck Forsberg WA7KGX N2469R c...@omen.com www.omen.com
Developer of Industrial ZMODEM(Tm) for Embedded
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