[Elecraft] KX3 direct conversion system

[須崎 純一]

Hello Johnny,

Exactly! I'll be there (Tokyo big site) on 25-26th, almost at booth J-08.
I expected to touch KX3 there last year, but regrettably no information in Japan.
At that time, I didn't forecast the 'X'mas order'.
Hope to see you there.

Jun JI1TLL

Date: Thu, 16 Aug 2012 06:52:11 +0800
From: vr2xmc at yahoo.com.hk
Subject: KX3 direct conversion system
To: ji1tll at jarl.com
CC: elecraft at mailman.qth.net

Hello Jun, Will go to the Tokyo Ham Fair next week?  I will be there next week.  I could possibly wonder around the A1 club, Tokyo International Amateur Radio Association, Icom or JARL booths. TNX & 73,

Johnny VR2XMC
        寄件人︰ 須崎 純一 <ji1tll at jarl.com>
 收件人︰ elecraft at mailman.qth.net 
 傳送日期︰ 2012年08月16日 (週四) 12:34 AM
 主題︰ Re: [Elecraft] KX3 direct conversion system
   

Hi Matt,

Thanks for your quick response.
The function is sometimes effective especially in Tokyo.
The current consumption +10mA is not ignorable in outdoor.
Thank you again for useful information.

Jun, JI1TLL

> From: mzilmer at magellangps.com
> To: ji1tll at jarl.com; elecraft at mailman.qth.net
> Date: Wed, 15 Aug 2012 08:49:18 -0700
> Subject: RE: [Elecraft] KX3 direct conversion system
> 
> 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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