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Re: LF: dcf39

To: [email protected]
Subject: Re: LF: dcf39
From: "Laurence KL1X" <[email protected]>
Date: Wed, 04 Apr 2007 16:16:40 -0800
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Thanks Joe - up till today (or yesterday) Ive always taken DCF39 as a relative Gold standard for calibrating against globally.
Conditions look like they are coming up a bit - Budapest was just about
audible level this morning (0500 local) under the hubbub. Its interesting
using the SDR IQ at looking at some 190Khz of bandwidth - seems as though
137-138KHz is one of the most noisest spots from local in building and plc
noize - its about 12 dB better at 135.5. but still only in the -80's, no
wonder I dont hear/see much unless its strong.

Day Long term stability test (at LF) shows the "IQ" doesnt budge at dot120 at 20 deg room temp I can see. I have to knock the IF gain back a bit to 12dB at night otherwise I get clipping, and putting the NB on to any level brings up Loran audibly (its strong here at around -55dBm). First few days of operation and comparison against R75 with Argo on 500 and 137Khz shows comparable results under my operating conditions. I rather like it, once you learn how to drive it..

Laurence KL 1 X /BY4 Shanghai
Misty 12degC


From: Joe Craig <[email protected]>
Reply-To: [email protected]
To: [email protected]
Subject: Re: LF: dcf39
Date: Wed, 4 Apr 2007 19:51:49 -0230 (NDT)

Hi Laurence,

Yes, it appears as if DFX39 has drifted a bit here as well.

Cheers
Joe VO1NA

On Wed, 4 Apr 2007, Laurence KL1X wrote:

>
> Good morning - can anyone verify that dcf39 is about 0.4Hz or so high of > its normal 138.83 "mark" carrier freq at this time? I was calibrating the
> SDR and noticed a difference between Budapest and
> DCF39 normal argo plots and thought it was an oddity with the new rx but on
> checking with the  R75 I get the same results -
>
> thanks
>
> Laurence KL1X
>
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