That sounds about right comparing it to the W2. I only wish we could use the W2 sensors as I already have what I need of those.
Sent from my Verizon Wireless 4G LTE smartphone
<div>-------- Original message --------</div><div>From: [hidden email] </div><div>Date:04/20/2015 10:11 AM (GMT-05:00) </div><div>To: [hidden email], [hidden email] </div><div>Cc: </div><div>Subject: Re: [Elecraft] P3 Transmit Monitoring Feature </div><div>
</div>I think he said about $300.
Sent from my iPad
-------- Original Message --------
Subject: [Elecraft] P3 Transmit Monitoring Feature
From: Harry Yingst via Elecraft <[hidden email]>
Date: Apr 20, 2015 7:03 AM
To: "Elecraft Reflector" <[hidden email]>
Has anyone seen a ballpark price for this?
"We've been testing a new transmit-monitoring feature on the P3
panadapter, which provides simulated analog power and SWR meters as well
as high-resolution transmit envelope display. We had hoped to have this in
time for Visalia but now it's looking like Dayton. Various full-scale
power ranges are provided including 200 W and 2 KW, using a transmit RF
sampling unit based on the ones used with the W2 wattmeter."
> On Apr 20, 2015, at 10:56 AM, hsherriff <[hidden email]> wrote:
> That sounds about right comparing it to the W2. I only wish we could use the W2 sensors as I already have what I need of those.
l guess we’ll know when we know.
My sensor string already gets me whistling “Dem Bones", including pickoffs for an LP-100A, a NYE Power Meter (because analog meters are just plain easier to read), one low power and one high power sensor for an AM modulation monitor, and a variable Bird sampler for a scope. If the new monitor includes both peak and average PWR/SWR and signal envelope monitoring, maybe I can actually cut out one or two and reclaim a couple tenths of a dB in radiated power :-)
The SVGA option is not required for the TX monitor feature. It does
require a small option board which fills one of the unused holes on the
P3 back panel and an external power sensor similar to a W2 wattmeter
sensor. The only difference from a standard W2 sensor is several
capacitors have a smaller value to improve the bandwidth for the
modulation envelope display.
The new firmware to support the sensor is pretty far along. The main
thing we're working on right now is the aesthetics of the "meter"
displays that show the PEP/average power and SWR.
Time. When transmitting, the spectrum display is (optionally) replaced
by a display of the modulation envelope. One cool feature that I
haven't seen elsewhere is that when the K3 is in CW mode, the envelope
display optionally uses a split screen where the left half shows the CW
rise and the right half the fall so you can see both edges at the same time.
The simulated meter displays are at the bottom. The one on the left
reads PEP and average power and the one on the right SWR. There is also
a digital readout of PEP power and SWR.
Either or both the modulation envelope and meter displays can be enabled
and disabled via menu entries. You can also change the full-scale power
for the meter and the ms/div for the modulation envelope display (the
amplitude is auto-scaled).
So what is the expected current draw for the new "meters" PCB? I kinda
like powering my "non-SVGA" P3 from the back of my "unmodified" K3. I
may eventually do the K3 pwr mod but it's not in the near future.
Bottom line: how much current does this "meters" PCB draw? And will I
be able to use it from an "unmodified" K3?
The interface board draws essentially no current (< 1 mA). I'm not sure
exactly how much power the sensor itself draws but it's low also, on the
order of 8 mA max from the 5V internal supply, perhaps 4 mA from the 12V