[time-nuts] Question on GPS and reference standards

[paul swed]

Oh I actually understand the radio.
I was looking at the wenzel and will guess that would be quite expensive.
This from a flea market junky.
Regards

On Thu, Dec 23, 2010 at 12:24 PM, <scmcgrath at gmail.com> wrote:

> Because the Rockwell-Collins HF80 has sensitivity and selectivity which are
>  avaialble only in Ham gear costing 7000+ definitely not in the
> 'inexpensive' category,  it's transmit signal is also far cleaner than most
> synthesized HF Rigs.
>
> So it makes sense to upgrade the reference oscillator to use this radio
> with more modern modes such as PSK31 and coherent CW. (Occupied bandwith
> less than 5 Hz)
>
> Scott
> Sent from my Verizon Wireless BlackBerry
>
> -----Original Message-----
> From: Joseph Gray <jgray at zianet.com>
> Sender: time-nuts-bounces at febo.com
> Date: Tue, 21 Dec 2010 22:39:38
> To: Discussion of precise time and frequency measurement<
> time-nuts at febo.com>
> Reply-To: Discussion of precise time and frequency measurement
>        <time-nuts at febo.com>
> Subject: Re: [time-nuts] Question on GPS and reference standards
>
> Not knowing all the particulars and requirements, I may be off base,
> but instead of spending money trying to frequency stabilize a 20+ year
> old radio (HF-80), wouldn't it make more sense to spend it on a
> modern, inexpensive HF rig? You can even get a TCXO option for some
> rigs. This should be stable enough for most common HF data protocols.
>
> I assume that this is for Amateur use? If not, then my comments may not
> apply.
>
> Joe Gray
> W5JG
>
> On Tue, Dec 21, 2010 at 9:48 PM, Bruce Griffiths
> <bruce.griffiths at xtra.co.nz> wrote:
> > A conjugate regenerative divider will have  asinewave output.
> > It only requires a mixer an amplifier or two and a couple of bandpass
> > filters.
> > It will have lower phase noise than all(?) alternative techniques.
> >
> > Bruce
> >
> > Tom Van Baak wrote:
> >>
> >> A good question for the group...
> >> /tvb
> >>
> >>> Hi:
> >>>
> >>> I have both a GPS Frequency standard (Trimble Thunder Bolt) which
> outputs
> >>> the 10
> >>> MHz reference and also the 1 PPS signal. In addition, I have a Collins
> >>> AEU unit
> >>> which has a 10 MHz Rubidium reference inside. Both units work well and
> >>> produce a
> >>> very accurate reference signal for the units that require a 10 MHz
> >>> reference.
> >>>
> >>> The challenge is that I am looking for a source of a 10:1 frequency
> >>> divider so I
> >>> can create a 1 MHz reference for my Rockwell Collins HF-80 system. Can
> >>> you
> >>> suggest a source of a high quality frequency divider that outputs a
> >>> (nearly)
> >>> sine wave signal? We only need two units - one for production and one
> for
> >>> our
> >>> development lab.
> >>>
> >>> The object is to provide a very accurate source of 1 MHz and 10 MHz to
> >>> the
> >>> various radio systems used in our disaster and humanitarian relief
> radio
> >>> network. When you send data, you need to be exactly on frequency.
> >>>
> >>> Any help would be great. Just need to be pointed in the right
> direction.
> >>> While
> >>> we could try to design something to meet this objective, I am sure that
> >>> someone
> >>> has already done this.
> >>>
> >>> Thank you.
> >>>
> >>> Kevin
> >>
> >>
> >>
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> >
> >
> >
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