[time-nuts] ELEMEK LXK WWVB Receiver

[Tom Holmes]

Hi Paul...

Thanks for that insight, There are 2 4046's on the board, but the guts of
the RX are hidden inside a can. It does have a time code output which could
be fun to play with. Am hoping to learn a bit more before I tear into it in
earnest.

Tom Holmes, N8ZM

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of paul swed
Sent: Wednesday, March 12, 2014 9:21 AM
To: n1hac at dartmouth.edu; Discussion of precise time and frequency
measurement
Subject: Re: [time-nuts] ELEMEK LXK WWVB Receiver

Tom
I may have missed your comment do you have one of these? It appears there
is very little data on them. Must not have been popular.
So from the posts I can give you a good guess. It would be a TRF receiver
without a crystal filter. This can be as reasonable as 4 transistor stages
to get that 100 DB gain. Further guessing. The PLL is based on 20 Khz phase
comp of a 100KHz ref/5. Could have been a cd4046 they were around back
then. I would truly be amazed if it actually used a set of mc1496 mixers
and quadrature decoding.
The new wwvb modulation will not allow the phase lock to lock. But the time
data may still be available if they were using simple AM demodulation with
a diode.
Thats my purest of speculation.
Regards
Paul
WB8TSL


On Tue, Mar 11, 2014 at 2:12 PM, David McGaw <n1hac at dartmouth.edu> wrote:

> From an ad in Radio-Electronics June 1980, it mentions that it phase-locks
> to the carrier.  I expect the new format of WWVB will give it fits.
>
> https://archive.org/stream/radio_electronics_1980-06/
> Radio_Electronics_June_1980#page/n71/mode/2up/search/wwvb
>
> 73,
>
> David N1HAC
>
>
> On 3/11/14 1:55 PM, Tom Holmes wrote:
>
>> Does anyone have any information on this box?
>>
>>
>> It has 60 kHz and 100 kHz outputs, runs on 12 VDC. Not much info found on
>> the web so far.
>>
>>
>> Tom Holmes, N8ZM
>>
>>
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