[DSP-10] 10 MHz ref

[Roger Hayward]

I just used a SPST switch on the back side of the box.  I routed coax to and
from it.  An external coax connector (for external 10 MHz) is right next to
the switch....

72.
	Roger


-----Original Message-----
From: dsp-10-bounces at mailman.qth.net [mailto:dsp-10-bounces at mailman.qth.net]
On Behalf Of Jimmy Oldaker W7CQ
Sent: Saturday, February 05, 2005 9:00 AM
To: Discussion of DSP-10 2-meter transceiver
Subject: Re: [DSP-10] 10 MHz ref

At 05:25 AM 2/5/05 , you wrote:
>I tried using the 1V p-p out of my 10M locked reference and found
>unreliable operation, so i fed it through a 74ls04 and now use the 5V
>signal
>
>As i got irritated having to take the ez-lite board out every time i
>wanted to change the link to go from internal to external reference,

ME TOO!

>I used the remaining sections of the 04 to detect when 10MHz is being
>supplied externally and do the switch over automatically using a small TO5
>DPDT can relay, at the same time disabling the internal oscillator. Its a
>small board that fits on the 3 pin oscillator plug under the ezlite
>enclosure. I must get round to writing it up someday!
>
>Dave
Dave

GREAT IDEA!

  I would be interested in the schematic.  I understand the basic principle 
but don't want to reinvent the wheel.

I would like a copy if you can work it up.

Jimmy W7CQ



Jimmy Oldaker
27640 Gibraltar Loop
Eugene, Oregon 97405

w7cq at teleport.com
541-686-8396

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