1. Will the K3EXREF work straight from the output of an Efratom LPRO-101 or
does it need a TTL square wave output or something else requiring extra
circuitry between the LPRO and the K3?
2. If the K3EXREF is installed, will the K3 still work as normal if the
frequency standard is not turned on?
1. Will the K3EXREF work straight from the output of an Efratom LPRO-101
or
does it need a TTL square wave output or something else requiring extra
circuitry between the LPRO and the K3?
A 10 MHz sine wave output from the Efratom is fine (+4 dBm to +16 dBm).
2. If the K3EXREF is installed,
On Sat, 16 Apr 2011 07:07:25 -0700 (PDT), you wrote:
The K3EXREF will use either a sine wave input at 4 to 16 dBm (2 to
3.3V), or a TTL signal. The manual advises using a 50 ohm series
resistor for 5V TTL to drop the voltage level into the proper range.
1. Will the K3EXREF work straight from the
I can answer 2, Julian. It is yes. If there is no external 10 MHz signal,
the K3 reference oscillator reverts to its normal operation. An asterisk
(splat, whatever one wants to call it) appears on the LCD when there's an
external signal detected, so you know at a glance whether the K3 is being
Ron - Shouldn't the asterisk be blinking if the K3 is being controlled
by and external reference? The presence of an asterisk merely indicates
that it has at some time been controlled by a reference since the last
power-up.
73 de David G4DMP
In a recent message, Ron D'Eau Claire r...@cobi.biz
...@g4dmp.fsnet.co.uk
To: Ron D'Eau Claire r...@cobi.biz
Cc: 'Julian, G4ILO' julian.g4...@gmail.com; elecraft@mailman.qth.net
Sent: Saturday, April 16, 2011 1:21 PM
Subject: Re: [Elecraft] K3EXREF Questions
Ron - Shouldn't the asterisk be blinking if the K3 is being controlled
by and external
: Saturday, April 16, 2011 10:21 AM
To: Ron D'Eau Claire
Cc: 'Julian, G4ILO'; elecraft@mailman.qth.net
Subject: Re: [Elecraft] K3EXREF Questions
Ron - Shouldn't the asterisk be blinking if the K3 is being controlled
by and external reference? The presence of an asterisk merely indicates
that it has at some
'; elecraft@mailman.qth.net
Subject: Re: [Elecraft] K3EXREF Questions
Ron - Shouldn't the asterisk be blinking if the K3 is being controlled
by and external reference? The presence of an asterisk merely
indicates
that it has at some time been controlled by a reference since the last
power-up.
73
And if you want to save about $50, there are several OCXO on e-bay
for $40-50 (with many offering free shipping). All you do is hook
them to 12vdc and coax to the K3EXREF, as most run at +10 dBm. The
waveform may not be a perfect sine wave.
--and no satellites were harmed in locking your K3!
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