[hpsdr] external 10MHz reference input

[John Sager]

Yes, sadly thats a 'feature' of the onboard 10MHz ref, I assume it does
some kind of open-loop temperature compensation, which involves stepping
the oscillator frequency, but well within the published accuracy
specifications. I've recently acquired a Rubidium standard to drive my
Hermes, but for most purposes a (analogue) TCXO or OCXO would be
perfectly adequate.

73 John G8ONH

On 17/05/13 20:37, H.A.Meijer wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
> Hi,
>
> Thats the one I was looking for.
> I want to use my 10MHz gps ref. osc. because my onboard 10mhz osc starts to
> jumps in freq.
>
> Thanks!,
> Bert
>
> Op 17-5-2013 21:18, Bruce Beford schreef:
>> ***** High Performance Software Defined Radio Discussion List *****
>>
>> Hermes R141 was changed from 100 ohms to 50 ohms. Picture here:
>> http://home.myfairpoint.net/vze1t5sc/Hermes%20R141.jpg
>>
>> 73,
>> Bruce
>> N1RX
>>
>>
>>> I know there has been a resistor change at the input circuit but I don't
>>> know which one and can't find it back.
>>> Can someone help me out which resistor has changed there?.
>>
>>
>>
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-- 
John Sager

Computer Security Consultant

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