[hpsdr] hpsdr Digest, Vol 3, Issue 26

[Achim Vollhardt]

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