Posted by
John Ragle on
Jun 27, 2011; 1:42am
URL: http://elecraft.85.s1.nabble.com/Boots-for-the-XG3-tp6514422p6518592.html
Alan...
After consideration of a couple of points raised on and off the list, I
wrote to Elecraft (re; parts):
"Wayne (& Eric)...
I am now pretty much convinced that my idea of building up a
post-amplifier for the XG3 is a *very bad* idea. As several people
pointed out to me, the jitter in the output (phase noise in the
frequency domain) makes the XG3 a poor candidate to put on the air as a
beacon, particularly when amplified to the 1-5 watt level."
I also wrote to a couple of others:
"I'm beginning to be sorry I raised this whole matter...as Joe
Subich points out, the XG3 is a fearsome noise generator, and running it
into 30 dB of amplification would make a mess. If you have an XG3, hook
it up to your K3 and watch the noise level well off the set frequency on
your P3. For my equipment, the noise level 250 kHz off the the set
frequency goes up by 36 dB when the XG3 is set at -33 dBm, and off scale
on the 0 dBm setting. No need to feed that to an antenna...
"My comments on the gain blocks and the power module are still
cogent, however, and [would] simplify the process of carding up a
crystal oscillator. Such a project might [also] bring in more people to
PIC programming and usage..."
It looks to me like a DDS source might be worthwhile exploring. There is
a relevant kit sold by Midnight Design Solutions, e.g.:
http://midnightdesignsolutions.com/dds60/John Ragle -- W1ZI
=====
On 6/26/2011 9:22 PM, Alan Bloom wrote:
> The other problem with adding boots to the XG3 is key clicks. As I
> understand it, there is no key shaping. Not a problem with a 1 mw
> transmitter but it might be objectionable with 20 watts.
>
> Alan N1AL
>
>
> On Sat, 2011-06-25 at 10:00 -0400, Joe Subich, W4TV wrote:
>>> So, I am asking the list: "Is there any interest out there amongst XG3
>> > owners in having Elecraft bag up a partial kit as outlined above?"
>>
>> If such a kit was to be made available, I would suggest a gain block
>> capable of operation on the three highest bands (28-148 MHz) with the
>> necessary LPF values for each band.
>>
>> I'm also not sure that a kit should be capable of much more than 1 W
>> output as a bunch of 20 W signals with fairly high levels of phase
>> noise would not be exactly welcome on most bands.
>>
>> 73,
>>
>> ... Joe, W4TV
>
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