Our P3 Panadapter display adds a visual dimension to signal hunting with fast real-time spectrum and waterfall displays of band activity. The P3 offers superior sensitivity and Direct Sampling DSP processing, giving you the ability to see signals down to the noise floor of the K3S (and K3).
a. The Transmit Monitor feature will use the P3 display to present transmit power, modulation and SWR bar graph displays
b. Used in conjunction with an external RF sensor placed into the transmission line, the P3 samples the RF signal in order to process it.
c. When the K3 goes into transmit, the modulation envelope "oscilloscope" display temporarily replaces the spectrum display whenever the rig goes into transmit mode. This can be turned off when needed using the P3’s menu.
a. Only the spectrum display is over-written by the modulation envelope during transmit.
b. If you have only the spectrum display enabled, the entire screen will be overwritten with the modulation envelope.
c. If the waterfall display is enabled, the waterfall will freeze during transmit but the waterfall image is maintained as the modulation envelope is displayed in the spectrum portion of the display.
a. The P3 modulation monitor (and watt/SWR meters) uses a 400 mS delay to determine when to switch back from transmit to receive. So as long as the time between dits or whatever is less than this delay, you don't see the modulation display turning on and off.
a. No. The transmit signal results will be on the main P3 display screen.
a. Meter readings will display in the time domain. When transmitting, the spectrum display can be replaced by a display of the modulation envelope.
b. Unique to the P3, the envelope display can optionally be set up as 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.
a. The modulated signal envelope display takes the place of the ‘real-time’ window on the P3. The waterfall, however, will remain in place. The meters, seen below, begin measurements when the K3 enters Transmit, as does the upper waveform display. When enabled, the meters will remain on the screen.
You can also turn off the waveform envelope and monitor only the meters. In this mode, the bar graph meters will be active when you go into transmit.
a. Here is the display, shown in CW split window form, showing rise and fall time of a single element. That is, split windows are available when the K3 is in CW mode only.
The display can also be set up to display a longer scale and monitoring high-speed CW elements (~ 50 wpm).
a. Both the modulation envelope and meter displays can be enabled and disabled via menu entries.
b. You can also change the full-scale power for the meter and the millisecond/div setting for the modulation envelope display. The modulation envelope display is auto-scaled when required.
c. The amplitude of the power meter and digital power readout can be calibrated in a menu setting (MtrScale).
a. When installed, the added current draw for the Transmit Monitor is expected to be less than 10 mA—a very small fraction of the P3’s total current drain.
a. Yes. You can select the Sensor that works at VHF frequencies to do so.
a. In addition to the many features for Receive operations, operators now can outfit their P3 to include a Transmit waveform monitor.
b. This means that the P3’s display will provide TX monitoring when the K3 goes into transmit.
a. All P3s will require an adapter board to which a sensor will be connected.
b. You will then choose the proper sensor based on band and power level.
| I want to Monitor | Items needed for your order |
|---|---|
| 160M to 6M at less than 200 watts |
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| 160M to 6M at less than 2000 watts |
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| VHF (2 meters) at less than 200 watts |
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** Note: The interconnect cable will be included in the product order
a. There will be a small adapter board to install inside your P3. It will fill one of the unused holes on the P3 back panel, labeled SENSOR.
b. For signal pickup, there will be an external power sensor similar in size and form to the W2 wattmeter sensor.
c. These 2 items will be connected with CAT5/CAT6 cable plugging into RJ45 jacks. A length of cable will be provided as part of the product purchase.
a. No. One sensor can be connected at a time. Choose the most important bands to monitor for your needs.
b. You can, however, order more than one sensor and then connect them individually as needed.
a. No. One sensor can be connected at a time. Choose the most important bands to monitor for your needs.
b. You can, however, order more than one sensor and then connect them individually as needed.
a. The Sensor interconnect wire shipped with the option is 168 cm (about 5 ft, 6 inches) long. It will have RJ45 connectors on each end. To ensure guaranteed operation, this is the supported length.
b. Operators are welcome to extend the length of the interconnect cables, if needed, but Elecraft recommends positioning the Sensor in such a way that interconnect cable lengths are minimized.
a. This will depend upon what you want to measure. Here are 2 applications:
b. Placement on output side of a tuner: This will allow you to monitor the operation of the entire transmission line and antenna system as a whole.
c. Placement where the antenna joins the transmission line: This will allow you to monitor the optimum operation of the antenna. This enables you to monitor and adjust antennas with adjustable resonance points (SteppIr, for example) for maximum power transfer to the antenna itself.
a. No. You do not need to have the SVGA option installed first. The Transmit Monitor option can be installed at any time on any P3 that has been produced to date.
a. There will be a small board added to the P3’s Input/Output (I/O) board. The rear panel is already punched with a hole labeled SENSOR where it will appear when reassembled.
b. As with all Elecraft options, this addition will not require any soldering for installation.
a. Yes, there will be a firmware release to support the new hardware.
a. No. The K3’s firmware or configurations are not affected by the Transmit Monitor option installation.
a. Unfortunately, the Transmit Monitor option will not operate with non-Elecraft K3 radios. This is due to the P3 having no way of knowing when the transceiver has gone into transmit.
a. When you order the P3 Transmit Monitor option, there will be a version available for a 2 KW sensor. This will allow you to use a legal limit linear amplifier ahead of the sensor.
b. This sensor will be rated for a maximum of 2,000 watts in all modes.
a. The 200 watt sensor can be used to monitor transmission envelope down to as low as 2 watt full-scale display. This will provide reasonably accurate waveform displays down to a few tenths of a watt.
b. Likewise, the 2Kw sensor can be used as low as a 20 watt scale.
c. We do recommend the 200 watt sensor for QRP projects where possible.
