Hi, Graham, LF,
I can't quite remember which one it was between the Halcyon and the
Quartzlock 2A (as we had both at work and had to retire one type) but one of
these standards suffers from the phase modulation on BBC Radio 4 (the other
one is OK). Averaged over more than 1s, the frequency stability of the R4
carrier is not compromised, but I think it upsets the PLLs in the off air
standard. This might be the reason for the cyclic frequency drift.
73, Mike G7AQA.
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Graham
Sent: 25 January 2008 21:57
To: [email protected]
Subject: LF: Re: Re: Droitwich lock [was WOLF....
Ok Alan,
This is a quartzlock, model 2A . I get a good signal on 198, im using it at
the moment , be intresting to se if anyone detects any change in frequency,
but of course the signal is derived from the 800 hz tone from the sound
card, so that may drift as well , been running 6 hours so should be warmed
up
Using the 'triggering scope' method of comparing frequency's i can observe
a change about a fixed point , so ive set for the mid point , which looks to
be correct , todate im not totally sure what level of 'change' im observing
.. hihi
G ..
----- Original Message -----
From: "Alan Melia" <[email protected]>
To: <[email protected]>
Sent: Friday, January 25, 2008 10:24 AM
Subject: LF: Re: Droitwich lock [was WOLF....
> Hi Graham, yes ok, I have a Halcyon and that unlocks sometimes after dark.
> It may be due to noise and the use of the internal ferrite rod. There are
> quite big phase shifts after dark sometimes, and there is (was last time I
> measured it) a slight sytematic wobble, but it is only a few parts in
> 10^10
> and has a period of around 1000secs. I dont think I would use mine for a
> direct standard without a better aerial. Short term standard is an Austron
> 1250a....very nice.
> Alan
>
> ----- Original Message -----
> From: "Graham" <[email protected]>
> To: <[email protected]>
> Sent: Friday, January 25, 2008 12:59 AM
> Subject: LF: Re: Re: WOLF BEACON - 503.000 KHZ
>
>
>> Ok Alan,
>>
>> Should be the bbc on 198 khz ! , i have a idea it varies slightly .. the
>> ppl that is .. not the bbc
>> ... but by how much , im not sure
>>
>> G ..
>>
>>
>> ----- Original Message -----
>> From: "Alan Melia" <[email protected]>
>> To: <[email protected]>
>> Sent: Friday, January 25, 2008 12:05 AM
>> Subject: LF: Re: WOLF BEACON - 503.000 KHZ
>>
>>
>> > Hi Graham what are you locked to ??
>> > Alan G3NYK
>> >
>> > ----- Original Message -----
>> > From: "Graham" <[email protected]>
>> > To: <[email protected]>
>> > Sent: Thursday, January 24, 2008 11:26 PM
>> > Subject: LF: WOLF BEACON - 503.000 KHZ
>> >
>> >
>> > Hi All,
>> >
>> > Running WOLF 10 Beacon on 503.000 Khz ,
>> >
>> > Reports if possible, aslo frequency ? possible 2 hz LF ??
>> >
>> > Running tx locked to off air standard ,
>> >
>> > intrested if fequency has 'slow cyclic drif' ??
>> >
>> > tnx - Graham .
>> >
>> >
>> >
>> >
>> >
>> > --
>> > No virus found in this incoming message.
>> > Checked by AVG Free Edition.
>> > Version: 7.5.516 / Virus Database: 269.19.10/1241 - Release Date:
>> > 1/24/2008 09:58
>> >
>> >
>>
>>
>>
>
>
>
>
>
> --
> No virus found in this incoming message.
> Checked by AVG Free Edition.
> Version: 7.5.516 / Virus Database: 269.19.11/1242 - Release Date:
> 1/24/2008 20:32
>
>
|
