[Elecraft] KX3 direct conversion system

[Matthew Zilmer]

Hi Jun,

If you haven't tried it, set RX ISO to ON.  This enables an isolation amplifier that keeps the LO greatly attenuated outside the KX3.  The amp draws something like 10 mA, so use it only when you need it.

73,
Matt Zilmer, W6NIA


-----Original Message-----
From: elecraft-bounces at mailman.qth.net [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of ?? ??
Sent: Wednesday, August 15, 2012 8:03 AM
To: elecraft at mailman.qth.net
Subject: [Elecraft] KX3 direct conversion system


Hi all,
I built KX3 kit (S/N830) up last week after fixing some errors.
As soon as trying some functions, I found it's really a direct conversion system.  A weak leaked signal was observed with another receiver just on the watching frequency.
In my boyhood, I built Mizuho DC-701 which was a copy model of Heathkit
HW-7.   DC-701 also adopted direct conversion system and my local
station could detect my receiving point.   The leaked signal from KX3 is
not so strong as that of DC-701 and almost no problem.
Direct conversion with DSP system will be possibly adopted in higher class transceiver.
DC on 2m is interesting, however, challenging.
So transverter is reasonable solution and I'm expecting the module again.
Many thanks for proposing the innovated equipment.
 
The block diagram shows the transmission system is also 'direct conversion'.
The local oscillating frequency seems to be basically equal to the transmission frequency.
Is it correct?
 
Just one more twitting.   The optional microphone looks something a
little cheap, because it's same as that of Chinese kit KN7Qa.

Jun, JI1TLL
 		 	   		  
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