[Elecraft] P3TX questions

[Alan Bloom]

Yes, both the meters and the modulation envelope display can be 
independently enabled/disabled.  The P3 "analog" power meter shows both 
the average and peak power and there are digital readouts of peak power 
and SWR.

Alan N1AL


On 05/15/2015 06:40 PM, Harry Yingst wrote:
> Will we be able to turn off the wattmeters?
>
> I have a KPA500 sitting right next to my P3 so the meter is redundant
>
>
>
> ------------------------------------------------------------------------
> *From:* Alan Bloom <alan at elecraft.com>
> *To:* elecraft at mailman.qth.net
> *Sent:* Friday, May 15, 2015 9:07 PM
> *Subject:* Re: [Elecraft] P3TX questions
>
> On 05/15/2015 12:34 PM, Jeff Stai wrote:
> > 1. What about digital modes like RTTY and PSK at least? How will they
> > display? For these modes determination of good TX quality will be huge.
>
> The P3 screen shows the modulation envelope, so flat-topping of a PSK31
> signal, for example, should be obvious.  RTTY is constant-envelope
> modulation so you shouldn't see any amplitude changes.
>
> > 2. Distance from the sensor. In the FAQ the distance supported is 
> 5'6" but
> > longer is hinted as being possible. What are the considerations for a
> > longer run (say 20 feet)? For example, bigger conductors, or shielding,
> > or...?
>
> I'd say go ahead and try it.  I haven't tested longer cables but I can't
> think of any reason they wouldn't work.  All the input pins on the RJ-45
> have pi-type R-C filter networks.
>
> > 3. Switching sensors. I see that mechanical RJ45 switches are 
> available for
> > low prices, what are the considerations for using a switch? Also, is it
> > strictly necessary to switch all 8 lines?
>
> I suppose you could just leave the +5V (pin 1) and ground (pin 3) lines
> connected to both sensors all the time, but a mechanical LAN switch
> probably switches all 8 wires anyway so it's a moot point.
>
> > 4. Meter display. This might be my favorite feature to have 
> power/SWR right
> > there at the P3, but the meter display to my eye is at least twice 
> as tall
> > as it needs to be. For digital contesting especially I live and die 
> by the
> > waterfall and hate to give up any real estate. Will the meter display
> > height be adjustable? (I'd be happy with just the numbers down in a 
> corner,
> > like:
>
> We're still tweaking the design so a shorter meter face is a
> possibility.  You can also gain some display space by turning off the
> function key labels with the LABELS key or changing to a smaller type
> font with the "Font" menu selection.
>
> Alan N1AL
>
>
>
>
>
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