Monday, July 16, 2018

Two more new ones from the QRPGuys

This is really neat - a Digital Power Port -

"The QRPGuys Digital Power Port is a handy way to turn a common sealed lead acid battery (SLA)  or Lithium (LiFePO4) into a convenient power source for your indoor, portable operation, or other projects. It can be used with just about any size battery and voltage from 3-30V, as it is attached to the battery with clear packing tape. It uses a digital voltmeter will with .1V resolution so you can easily check your capacity before you depart and while your are operating. The output is fused with an automatically resetting Polyfuse rated at 3.0A continuous/5.1A trip. There is a convenient 2.1mm pin coaxial power jack for charging. Output connections are captive S.S. hardware. This kit can be built in less than an hour. On a difficulty scale of 1 to 5, 5 being the most difficult, this is rated at 1 or 2, depending on your experience." 

This is going to be great for Field Day - I placed my order!

The other kit is a Digital Field Strength Meter -

"The field strength meter is one of ham radio’s earliest diagnostic tools that can be used in a variety of tasks inside the shack and out in the field, from detecting rf leaks in coax cables, testing antenna improvements, and aid in determining antenna emission patterns. The QRPGuys Digital Field Strength Meter can detect RF energy over the VLF-500MHz range with sensitivities from -80dBm to +10dBm. It uses the popular Analog Devices AD8307 logarithmic detector/amplifier, used in many popular VNA’s, coupled with an on-board digital voltmeter that has been modified to compare small signal changes of about 0.7dB, and display a relative digital reading. We also see use of this device as an RF probe for troubleshooting signal flow thru circuits. The sensitivity is equal to our retired RF Probe, and the BNC input jack is the input point to connect a scope probe for this use. It is powered by a 9 volt battery (not supplied) attached directly to the pcb, with a continuous “on” switch, as well as a “momentary” pushbutton switch for spot checking the presence of RF. There is a potentiometer to adjust the amplitude of the RF sampled, an SMA connector with antenna, and a female pcb mounted BNC for connection to longer antennas, probes or other test inputs. It does contain one SMT IC component (AD8307), but all the other components are through hole. The pcb is small, 2.50” x 2.75” (63.5mm x 69.9mm) and can be used without a chassis. On a difficulty scale of 1 to 5, 5 being the most difficult, this is rated at 3 to 4. Allow an hour or so to build, depending on your experience."

Once again, I have no affiliation with the QRPGuys, 4 States QRP Group, SOTABeams or any other company for whom I make product announcements. Just trying to keep the QRP community informed as to new offerings as I see them.

72 de Larry W2LJ
QRP - When you care to send the very least!


  1. Hi Larry
    I can immediately see a major safety problem with the Power Port. Having two massive metal wing nuts and a metal switch so close together makes it extremely easy for the output to be shorted. There should be some physical barrier (plastic or otherwise) between the power terminal to prevent a dropped screwdriver or spanner shorting the power.
    73, Gareth - M5KVK
    Better still, use 45A Anderson PowerPoles.

  2. Thanks for the post Larry. I immidiatly ordered the digital FS meter. The SMT component will be a challenge. I really need this FS meter to do some more antenna experiments...73, Bas

    1. Thanks for the comment, Bas! If I can help even only one fellow Amateur Radio op with this blog, then it makes it all worthwhile! 73 de Larry W2LJ