[Elecraft] Boots for the XG3...

[Joe Subich, W4TV]

*PLEASE DO NOT* move forward with *any* amplifier for the XG-3.

Like John Ragle I have looked at the phase noise from my XG-3 and it
is completely unsatisfactory for beacon use.  At -33 dBm it raises the
receiver noise floor by more than 20 dB when measured at + 100 KHz on
28 MHz and + 250 KHz in 50 MHz.  The measured noise floor (MDS) is more
than -110 dBm and at 10W, the XG-3 would make an excellent jamming 
device.

When used as a beacon at even *ONE WATT* the required path loss would
need to be around 100 dB for the phase noise to be below the receiver
noise level and would still need to be 80 dB or more to be below the
local noise level on a "quiet" band.

If "boots" become common for the XG-3, I would urge Wayne to remove
the beacon capability from the XG-3.

73,

    ... Joe, W4TV


On 6/27/2011 2:05 AM, Edward R. Cole wrote:
> I obtained some 7-pole LP filters from Coilcraft:
> http://www.coilcraft.com/lcfilt.cfm
> http://www.coilcraft.com/pdf_viewer/showpdf.cfm?f=pdf_store:lcfilt.pdf
> cost $3.00 in single quantities.
>
> This would take care of harmonic suppression.  I have five of these
> for different frequencies but have been working on other projects so
> have not measured them using the XG3.  I intend to install mine in
> 1-inch copper pipe with BNC connectors for better isolation at very
> weak signal levels, but that would not be needed if incorporated into
> a beacon amplifier.  The easiest approach for that is using mmics and
> RF modules that are 50-ohm in/out.  All that is required is some dc
> bias and some RF bypassing of the dc lines.
>
> This is probably more appropriate for a third party than
> Elecraft.  I'm guessing it would be a low volume item.
>
> I proposed the MAR-6 plus M57735 to John Ragle.  The M57735 costs
> $67.75 from RFParts.
> http://www.rfparts.com/pdf_docs/57704-68776/57735.pdf
> The M57735 is rated 17w out for 200mw in, so with 20mw drive one
> might get 1.7w  (gain = 25 dB with 10mw drive).
> The MAR-6 are about $5 and will provide about 16-18dB gain with 0dBm input.
>
> Add filter, misc components, connectors, pcb, and enclosure and it is
> looking like about $100 without labor to assemble it.  Someone
> offering this as a kit would probably want another 25% markup for
> their time.  Add $12 for flat-rate shipping.
>
> How many folks would order a kit?
>
>
>
> 73, Ed - KL7UW, WD2XSH/45
> ======================================
> BP40IQ   500 KHz - 10-GHz   www.kl7uw.com
> EME: 50-1.1kw?, 144-1.4kw, 432-100w, 1296-60w, 3400-?
> DUBUS Magazine USA Rep dubususa at gmail.com
> ======================================
>
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