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Dasco DQ7013 10MHz Ovened Osc - CCT

Colin Ranson
 

Indeed Brian, it was the phone number I rang, a dear old lady answered and as soon as I mentioned DASCo she brightened up ! Think DASCO stands for Derek A Smith Company.

 

All sorted here now, its soak testing with my HUP DFS at the moment.

 

Regards

 

Colin.

 

Sent from Mail for Windows 10

 

From: Brian Flynn GM8BJF via groups.io
Sent: 07 February 2021 11:56
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Dasco DQ7013 10MHz Ovened Osc - CCT

 

Hi Colin,

You seem to have got the data you need. I ran mine off 12V and was not aware of issues. It ran that way Up a 30 ft tower north of Inverness at GM3WOJ's QTH.for a couple of years.
Mine came on a section of PCB which had an 8-pin 5v SMD voltage regulator and a TTL chip buffering the output of the oscillator. The schematic that David posted looks familiar!
I always liked the fact that it had the makers phone number on it. You don't see that often!

73s Brian GM8BJF

 
Brian Flynn GM8BJF
 

Hi Colin,

You seem to have got the data you need. I ran mine off 12V and was not aware of issues. It ran that way Up a 30 ft tower north of Inverness at GM3WOJ's QTH.for a couple of years.
Mine came on a section of PCB which had an 8-pin 5v SMD voltage regulator and a TTL chip buffering the output of the oscillator. The schematic that David posted looks familiar!
I always liked the fact that it had the makers phone number on it. You don't see that often!

73s Brian GM8BJF
Colin Ranson
 

Hi David,

 

Derek Smith, the original maker, got back to me. Lovely chap.

 

All now working and very stable. Checked against my GPS O/P om HP counter.

 

 

Thanks for help.

 

 

Colin de G8LBS

 

Sent from Mail for Windows 10

 

From: David GM6BIG
Sent: 06 February 2021 10:07
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Dasco DQ7013 10MHz Ovened Osc - CCT

 

Hi Colin,

See photo of a fuzzy diagram of a cct it was used in.
I don't have the physical pinout to hand, will dig it out later.

Osc is a bit sensitive Hz/volt on the control V, but usable up to 10G
with care.
Would recommend a separate dedicated regulated supply for the tuning
voltage.
The control voltage allows a wide-ish swing of the 10MHz, handy for some
applications.

The rumour mill suggests they work at 12V, some might, but they are
prone to instability at 12V.
Spec is 15V for a reason !

If you want to lock it, the VE2ZAZ design can be reduced to 4 chips or
so and it can be built on vero, just think about noise around the op amp
- easy.

Cheers DAvid GM6BIG

On 06/02/2021 00:00, Colin Ranson wrote:
>
> Brian,     good to hear theres another out there !    you say you have
> no data ?    all I’m looking for is the pin out connections and the
> volts to run it at if you can help with that.
>
> Best regards
>
> Colin
>
> Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986> for
> Windows 10
>
> *From: *Brian Flynn GM8BJF via groups.io
> <mailto:brian.flynn@...>
> *Sent: *05 February 2021 23:06
> *To: *UKMicrowaves@groups.io <mailto:UKMicrowaves@groups.io>
> *Subject: *Re: [UKMicrowaves] 10MHz Ovened Osc.
>
> Hi Colin,
> I have a Dasco DQ7013 10MHz OCXO. I got it from David GM6BIG. I have
> no data on it but I ran it for a couple years in the GM3WOJ 10 GHz 10
> Ghz beacon. It was stable and held the frequency within a few 10s of
> Hz at 10 GHz. I am currently using as the reference for my FT736R to
> lock an external 20048 kHz VCO. It is a good OCXO.
> 73s
> Brian GM8BJF
>
>



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David GM6BIG
 

Hi Colin,

See photo of a fuzzy diagram of a cct it was used in.
I don't have the physical pinout to hand, will dig it out later.

Osc is a bit sensitive Hz/volt on the control V, but usable up to 10G with care.
Would recommend a separate dedicated regulated supply for the tuning voltage.
The control voltage allows a wide-ish swing of the 10MHz, handy for some applications.

The rumour mill suggests they work at 12V, some might, but they are prone to instability at 12V.
Spec is 15V for a reason !

If you want to lock it, the VE2ZAZ design can be reduced to 4 chips or so and it can be built on vero, just think about noise around the op amp - easy.

Cheers DAvid GM6BIG

On 06/02/2021 00:00, Colin Ranson wrote:

Brian,     good to hear theres another out there !    you say you have no data ?    all I’m looking for is the pin out connections and the volts to run it at if you can help with that.

Best regards

Colin

Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986> for Windows 10

*From: *Brian Flynn GM8BJF via groups.io <mailto:brian.flynn@...>
*Sent: *05 February 2021 23:06
*To: *UKMicrowaves@groups.io <mailto:UKMicrowaves@groups.io>
*Subject: *Re: [UKMicrowaves] 10MHz Ovened Osc.

Hi Colin,
I have a Dasco DQ7013 10MHz OCXO. I got it from David GM6BIG. I have no data on it but I ran it for a couple years in the GM3WOJ 10 GHz 10 Ghz beacon. It was stable and held the frequency within a few 10s of Hz at 10 GHz. I am currently using as the reference for my FT736R to lock an external 20048 kHz VCO. It is a good OCXO.
73s
Brian GM8BJF

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