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From: "Charlie , W5COV" <cvest@cox.net>
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Date: Fri, 20 Sep 2013 23:26:34 -0500
Subject: Re: [rsgb_lf_group] X1M Chinese QRP HF Transverter transmitting well
 on 475khz
Reply-To: rsgb_lf_group@yahoogroups.co.uk
Content-Type: multipart/alternative;
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Making a change to the resistor on the LM386 to raise the gain makes a 
WORLD of difference !! I have both models of the X1M and both suffered 
from low speaker volume from the factory . Too low to even really use 
the speaker . Now I just crack the volume barely above the on position 
and can easily drive the small speaker into distortion from overload , 
but a MUST DO mod from everyone that has tried it .

We have people in the USA also working on an audio derived AGC circuit 
to actually use the MC1350 as an active AGC device , instead of a fixed 
amplifier . It will be SMT and fit inside the radio . Another group is 
working on a speech processor  , also SMT to insert between the mic and 
radio .

We have also put together some manuals and notes that potential buyers 
and current owners should find of use . You can find the links to the 
information here :  www.importcommunications.com under the X1M picture .

These China radios are interesting and fun to play with and make a few 
mods to . Hope to get to see more of the diagrams for the different 
radios coming out of China now .

PERFECT for the experimenter below 500 kHz. too !!

NO FINANCIAL INTEREST , etc.etc. just a customer having a LOT of fun , 
with especially the X1M !!

Charlie , W5COV , USA


On 9/16/2013 2:58 PM, Charlie , W5COV wrote:
>
> Just don't plan on using it for a regular CW contact as there is a 
> Firmware issue that keeps it transmitting and receiving on the same 
> frequency in CW and the split VFO doesn't work in CW , so you can't 
> "trick" it into working regular CW .Also the attenuator function is 
> not enabled .
>
> There are a few other firmware bugs , that it would be nice to have 
> contact with the factory / and or get the software in the public 
> domain . I have had no luck getting in direct contact with the factory 
> . I absolutely LOVE the little radio as an experimenter , but it needs 
> a few very minor tweaks to make it a piece of gold like it has the 
> potential to be .
>
> Charlie , W5COV
>
> On 9/16/2013 5:36 AM, Marco Scholz wrote:
>>
>> Hello,
>> Received on the weekend the Chinese X1M HF-Transceiver. This Rig can 
>> transmit from abt. 0.1 - 30MHz, but has only bandpass filters on 
>> 80,40,29,15 and 10m band. So i tried 475kHz with a external bandpass 
>> filter and i got 5W in USB or CW (Not tried it, but this should work 
>> as well on 137KHz). In combination with a bigger PA a relativ easy 
>> way to transmit on the low bands.
>>
>> vy73
>> Marco, DD7PC
>>
>
> 


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      <p>
  
  
    Making a change to the resistor on the LM386 to raise the gain makes
    a WORLD of difference !! I have both models of the X1M and both
    suffered from low speaker volume from the factory . Too low to even
    really use the speaker . Now I just crack the volume barely above
    the on position and can easily drive the small speaker into
    distortion from overload , but a MUST DO mod from everyone that has
    tried it .<br>
    <br>
    We have people in the USA also working on an audio derived AGC
    circuit to actually use the MC1350 as an active AGC device , instead
    of a fixed amplifier . It will be SMT and fit inside the radio .
    Another group is working on a speech processor&nbsp; , also SMT to insert
    between the mic and radio .<br>
    <br>
    We have also put together some manuals and notes that potential
    buyers and current owners should find of use . You can find the
    links to the information here :&nbsp; <a class="moz-txt-link-abbreviated" href="http://www.importcommunications.com">www.importcommunications.com</a>&nbsp;&nbsp;
    under the X1M picture .<br>
    <br>
    These China radios are interesting and fun to play with and make a
    few mods to . Hope to get to see more of the diagrams for the
    different radios coming out of China now .<br>
    <br>
    PERFECT for the experimenter below 500 kHz. too !!<br>
    <br>
    NO FINANCIAL INTEREST , etc.etc. just a customer having a LOT of fun
    , with especially the X1M !!<br>
    <br>
    Charlie , W5COV , USA<br>
    <br>
    <br>
    <br>
    <br>
    <br>
    <br>
    <br>
    <br>
    <br>
    <br>
    <br>
    <br>
    <br>
    <br>
    <br>
    <br>
    <br>
    <br>
    <br>
    <br>
    <br>
    <br>
    <br>
    <br>
    <br>
    <br>
    <br>
    &nbsp; <br>
    <div class="moz-cite-prefix">On 9/16/2013 2:58 PM, Charlie , W5COV
      wrote:<br>
    </div>
    <blockquote cite="mid:523762D4.20807@cox.net" type="cite">
      <span>&nbsp;</span>
      
          <div id="ygrp-text">
            <p> Just don't plan on using it for a regular CW contact as
              there is a Firmware issue that keeps it transmitting and
              receiving on the same frequency in CW and the split VFO
              doesn't work in CW , so you can't "trick" it into working
              regular CW .Also the attenuator function is not enabled .<br>
              <br>
              There are a few other firmware bugs , that it would be
              nice to have contact with the factory / and or get the
              software in the public domain . I have had no luck getting
              in direct contact with the factory . I absolutely LOVE the
              little radio as an experimenter , but it needs a few very
              minor tweaks to make it a piece of gold like it has the
              potential to be .<br>
              <br>
              Charlie , W5COV<br>
              <br>
            </p>
            <div class="moz-cite-prefix">On 9/16/2013 5:36 AM, Marco
              Scholz wrote:<br>
            </div>
            <blockquote cite="mid:RncD1m03N2JKsGa01ncEpJ" type="cite"> <span>&nbsp;</span>
              <div id="ygrp-text">
                <p>Hello,<br>
                  Received on the weekend the Chinese X1M
                  HF-Transceiver. This Rig can transmit from abt. 0.1 -
                  30MHz, but has only bandpass filters on 80,40,29,15
                  and 10m band. So i tried 475kHz with a external
                  bandpass filter and i got 5W in USB or CW (Not tried
                  it, but this should work as well on 137KHz). In
                  combination with a bigger PA a relativ easy way to
                  transmit on the low bands.<br>
                  <br>
                  vy73<br>
                  Marco, DD7PC</p>
              </div>
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