[time-nuts] Question on GPS and reference standards

[scmcgrath at gmail.com]

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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