[hpsdr] GIBRALTAR, HP 10811 double oven OCXOs, and GPScon?

[Alex]

We need the ability to either have an external reference in or to install a GIBRALTAR. The former will probably be a simple card to plus into ATLAS with an external connector for the reference signal. GIBRALTAR will provide good frequency stability for most uses, and persons who want higher stability can use a higher-stability external reference.

Alex, N3NP

----- Original Message ----
From: Achim Vollhardt <avollhar at physik.unizh.ch>
To: Alex <harvilchuck at yahoo.com>
Cc: hpsdr at hpsdr.org
Sent: Friday, May 19, 2006 3:11:29 AM
Subject: Re: GIBRALTAR, HP 10811 double oven OCXOs, and GPScon?

Hello Alex,
to my understanding, the idea of Gibraltar is not to perform as an 
Z3801A.. I guess what we need here is *precision*, not necessarily 
*stability*. So a GPS rx stabilised with a medium clasee OCXO like the UK 
design mentined above should be sufficient. 

And more reasonable priced.. AND fitting into 100x100x (slot pitch of 
Atlas).. my HP10811 is already larger than a 100mm cube, so fitting 
something like this into Gibraltar sounds impossible to me.

73s Achim, DH2VA


On Thu, 18 May 2006, Alex wrote:

> GIBRALTAR is targeted at people who don't have a Z3801A hanging around (I can't say much, I have two Z3801As myself).
> It is nice to have the option of putting everything into a self contained package. Then people don't have to go searching eBay for used Z3801As.
> 
> Personally I would like the ability to provide an external 10MHz reference input to ATLAS without having to install a GIBRALTAR. 
> (unless I scrap one of my Z3801As out and pull the HP 10811 for use with a GIBRALTAR). 
> 
> Now if we could get GIBRALTAR to spit out the same information that the Z3801A does on it's RS-232 port I could reuse my copy of GPSCon.
> 
> Hey, I think we've got a use for that spare serial port on the Cypress FX2! Take the NEMA output from GIBRALTAR and send it back to the host computer. Then get GPSCon to support GIBRALTAR. (No, I don't know K8CU, I only have a copy of the software).
> 
> Alex, N3NP
> 
> ----- Original Message ----
> From: Achim Vollhardt <avollhar at physik.unizh.ch>
> To: hpsdr at hpsdr.org
> Sent: Thursday, May 18, 2006 4:11:04 PM
> Subject: Re: [hpsdr] hpsdr Digest, Vol 3, Issue 26
> 
> ***** High Performance Software Defined Radio Discussion List *****
> 
> Dear Steve and Alex,
> I think we have to decide on what we want. Using an HP10811 or 
> equivalent will give us 1E-11 accuracy. Nice for GHZ applications, but 
> even there needed only for very few applications. I would say 1e-8 is 
> totally sufficient for 99% of hamradio applications. And then, a simple 
> OCXO connected to any GPS engine will do it.. most have 1pps accuracy of 
> 100ns which is 1e-7.. on HF(30 MHz) this is 3 Hz. If we want to push the 
> envelope slightly more, 1e-8 should be fine (that would be an M12-class 
> GPS rx), but do we need more for the HPSDR? I would opt for an external 
> input.. anyhow, an HP10811 will never fit into the HPSDR enclusure :)
> 
> 73s Achim, DH2VA
> 
> 
> 
> > Date: Wed, 17 May 2006 20:23:51 -0700
> > From: "Steven Bible" <n7hpr at tapr.org>
> > Subject: Re: [hpsdr] High Accuracy Timing for HPSDR
> > To: <hpsdr at hpsdr.org>
> > Message-ID: <DEEIIECOPELFOEIOFHLGCEMNIOAA.n7hpr at tapr.org>
> > Content-Type: text/plain;    charset="us-ascii"
> > 
> > 
> > Very interesting.  After Dayton let me take a look at this.  If I forget,
> > remind me!
> > 
> > 73,
> > 
> > - Steve, N7HPR
> >  (n7hpr at tapr.org)
> > 
> > 
> >> > -----Original Message-----
> >> > From: hpsdr-bounces at hpsdr.org [mailto:hpsdr-bounces at hpsdr.org]On Behalf
> >> > Of Alex
> >> > Sent: Wednesday, May 17, 2006 7:14 PM
> >> > To: Achim Vollhardt; hpsdr at hpsdr.org
> >> > Subject: Re: [hpsdr] High Accuracy Timing for HPSDR
> >> >
> >> >
> >> > ***** High Performance Software Defined Radio Discussion List *****
> >> >
> >> > That's a bit pricey.
> >> >
> >> > How about we use G8ACE's design and investigate rolling our own.
> >> > G8ACE MKII OXCO  - http://www.microwaves.cwc.net/
> >> >
> >> > Alex, N3NP
> 
> 
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