[time-nuts] Neat looking DMTD unit on eBay

[Bob kb8tq]

Hi

With any DMTD, the offset between the LO and the DUT is a critical part of the
resolution. Without much info on the LO, it is not very easy to work out just what
they might or might not be doing.

That said, with “normal” offset frequencies, a filpflop would be challenged to hit
the sort of resolution they are claiming. They might be using XOR gates ….

Indeed all of this is why some of the competition went with a DDS for the LO. 

Bob

> On Apr 22, 2019, at 3:46 PM, Bruce Griffiths <bruce.griffiths at xtra.co.nz> wrote:
> 
> The mention of deglitching after the mixers perhaps indicates that the mixers may be flipflops and that the device is perhaps a DDMTD. Alternatively the block diagram is intentionally misleading.
> 
> Bruce 
>> On 23 April 2019 at 03:11 cdelect at juno.com wrote:
>> 
>> 
>> Hi,  
>> 
>> A friend directed me to this listing. Nice looking DMTD unit.
>> Low power and compact!
>> Has anyone played with one of these yet?
>> 
>> https://www.ebay.ca/itm/123728915157?ul_noapp=true
>> 
>> Cheers,
>> 
>> Corby
>> 
>> 
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