|
Hi Laurence,
I would suggest 137780.0 Hz.
The uHz spectrograms from Chris 4X1RF (in Bucharest
and Haifa) and mine (in Nuernberg) continuously cover the "TA" range 137774
to 137781 Hz. We normally "park" a 0.05 Hz wide high-resolution display
slot on 137780 Hz, but it can be shifted around a posteriori
within this range.
There are weak European Loran lines from Sylt /
Lessay on 137780.4190 and 137778.3705 Hz.
The nearest DCF-39 modulation gap would
be approximately 137764 to 137772, a few Hz below the TA slot.
But noiseblaning pretty much removes all the remaining splatter here, so
it's probably not worthwhile shifting the grabbers to this
slot.
At nighttime, my largest source of interference is
mostly music and speech due to Luxembourg effect on the DCF carrier - of course
there is nothing like a preferred frequency in those audio
spectra..
Looking forward to your trials!
Best 73,
Markus (DF6NM)
Sent: Tuesday, October 02, 2012 11:25 PM
Subject: LF: Ref Markus XPQ microHz
Markus - can you define a descrete freq that you
would be consider the best s/n in Europe for me to plop a carrier on for XPQ
measurement? Still some way but Im happy with the coherent nature
of the GPS derived signal source for the Decca driver. The source will be the
HP3336b GPS 10MHz ref'd Laurence KL1X Alaska
From: [email protected]To: [email protected]CC:
[email protected]Date:
Sun, 2 Sep 2012 18:15:18 +0200 Subject: Re: LF: WE2XPQ 137.7752, DCF39
appears
Laurence,
I'd be interested to see whether XPQ could be
detected in a microHz spectrogram here, either on Chris' grabber
in Bucharest
or mine in Nuernberg. Can you give your exact
frequency, and could you transmit a stable uninterrupted carrier for a couple of
hours? We've been seeing narrow traces from US East coast stations
before, but I wonder how much effect transpolar Doppler could
have.
Is DCF-39 really as strong as 25 dB in 100
Hz, ie. 45 dB/Hz, or would that be in 0.1 Hz? What are the best
hours?
Best 73,
Markus (DF6NM)
Sent: Sunday, September 02, 2012 4:21 AM
Subject: LF: DCF39 appears
Nice to see DCF39 appearing on QRSS this evening over the Pole. Ive
not seen it since Spring here in Alaska. About 25dB noise in 100Hz (ish units).
Not dark yet either,
Laurence KL1X WE2XPQ Wasilla AK
Sent: Sunday, September 02, 2012 2:17 AM
Subject: LF: XPQ
Further testing on 137.7752 ish carrier only ongoing - still in
shakedown mode but sweeps of individual 400w Modules show the same resonance and
output parameters from 2005 :-) http://kl7uk.com/XPQ2.jpgSet up in
garage. Laurence We2xpq KL1X Wasilla Alaska
Sent: Thursday, August 30, 2012 6:34 PM
Subject: LF: WE2XPQ 137.7752
A little bit of
Nostalgia - WE2XPQ Wasilla Alaska is very intermittently testing on
137.7752 DFCW various speeds and the odd bit of QRSS - Power will be up
to 2W ERP but is to be confirmed.
Periods of operations,
modes and powers will vary as Im trying to remember all the ins and outs of why
I installed 'X" relay to do a "Y" function as its been 7 years or
so.
Transmitter for the moment is the Decca 5501, drivers are
FT817 h/b transverter, Loop with around 100m circumference at 50ft or so and
phase meter. The Birch trees bend a lot more than the OKie Cottonwoods so
not sure how much detuning will happen as thing become more slack or as the
trees become snow laden -
Laurence We2xpq KL1X Wasilla Palmer
Alaska BP51IP
|
