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

[Alex]

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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