k J. Wilson, K1RO, k1ro@arrl.org
Mar
Product Review
Midnight Design Solutions Phaser Digital
Mode Transceiver Kit
Reviewed by Steve Ford, WB8IMY
wb8imy@arrl.org
Many of you may remember Dave Benson, K1SWL.
He was the designer and entrepreneur behind
Small Wonder Labs, the manufacturer of some of
the most popular low-power (QRP) transceivers
ever created. Several years ago, Dave
decided that it was time to retire and close
his business, much to the disappointment
of many in the QRP community.
Well, he’s back!
Dave has teamed with George Heron, N2APB, of
Midnight Design Solutions, to offer a new set of QRP
transceivers known as Phasers. These little radios
are intended for use with the wildly popular FT8 digital mode. If any communication mode was tailor
made for QRP, it is FT8. With just a few watts and an
antenna, you can make contacts throughout the
world, even during the marginal conditions we’re
Bottom Line
The Phaser Digital Mode Transceiver o ers a
clever and inexpensive way to get on FT8 and
other digital modes with a compact, dedicated QRP transceiver that is easily used in
the eld.
experiencing in the depths
of the solar minimum.
Phaser Flavors
Phaser transceivers are kits designed for operation
on a single band. You have your choice of kits for 80,
40, 30, 20, or 17 meters. Dave designed each transceiver to be hard-coded for output on the FT8 frequency for each band. However, every transceiver is
capable of operating on an alternate frequency that
you can program yourself. If you want to operate
another digital mode on the band, such as PSK31,
for example, the frequency can be changed accordingly. So, while the Phasers are sold as “FT8 transceivers,” they are actually multimode digital radios.
Reprinted with permisison; copyright ARRL.
www.arrl.org QST July 2020 45
Figure 4 — Parts are mounted on labeled cards for easy
identifi cation.
The Phaser transceiver generates about 4 W SSB
output. Because virtually all FT8 operating takes
place using upper sideband (USB) transmissions,
the Phaser is hardwired for that mode.
Building the Phaser
For this review, I selected the 20-meter model and
ordered the optional enclosure kit. The transceiver
board is just 4.125 × 3.85 × 1.2 inches and includes
seven preinstalled surface-mount components.
Figure 5 — The P haser enclosure front panel includes switches
and LED indicators for selecting the standard FT8 frequency or
alternate (user-programmed) frequency. (Note that the TRANSMIT
indicator LED incorporated into the latest version could be
mounted on the front panel as well.)
The through-hole parts are all mounted on labeled
cards (see Figure 4). No more sorting and squinting
as you try to read resistor color codes or barely legible numbers on disc capacitors. I’ve never seen such
a straightforward approach to kit building, and
Midnight Design Solutions should be congratulated
on going the extra mile to ensure success. All you
have to do is follow the instructions and pluck the
parts you need from the cards.
The downloadable assembly manuals are thorough
and colorful. Someone put a lot of effort into these
documents. Once again, the obvious goal is to make
the assembly steps as clear as possible. The manual
even has a sense of humor. I had to chuckle upon
seeing a visual example of an improperly wound
toroid inductor. The caption beneath the image read:
“Bad Toroid! (Bad, bad, toroid!).”
The assembly steps are divided into six groups of
parts. When you complete a group, the manual
instructs you to run some tests to make sure that the
section of the transceiver you just built is functioning
normally. I’m an experienced kit builder, so I chose to
skip the tests. That’s not the best approach for these
Figure 6 — The rear-panel connections for
AUDIO IN/OUT, ANTENNA, and POWER.
Figure 7 — The front-panel pushbutton switches and LEDs are
soldered to traces on the back side of the panel and connected to
the PC board with a ribbon cable.
46 July 2020 QST www.arrl.org
Reprinted with permisison; copyright ARRL.
Table 2
Phaser Digital Mode Transceiver Specifications
Frequency coverage:
Phaser-80 board, 3.573 MHz (FT8) and 3.578 MHz (JS8/Alt)
Phaser-40 board, 7.074 MHz (FT8) and 7.078 MHz (JS8/Alt)
Phaser-30 board, 10.136 MHz (FT8) and 10.130 MHz (JS8/Alt)
Phaser-20 board, 14.074 MHz (FT8) and 14.078 MHz (JS8/Alt)
Phaser-17 board, 18.100 MHz (FT8) and 18.104 MHz (JS8/Alt)
(For each band, the FT8 frequency is hard-coded and the Alternate
frequency is set for JS8 but can be reprogrammed by the user for
FT4, PSK, or other frequencies.
Transmitter operation: Phasing SSB, 4 W output (nominal).
Receiver minimum discernible signal (MDS): –109 dBm.
Power requirements: 12 V dc at 130 mA (receive) and 1 A (transmit).
Size (height, width, depth): 1.2 × 4.125 × 3.85 inches (PC board); 2 × 5 ×
4.5 inches (enclosure).
Weight: 11 ounces with enclosure.
kits, though, as troubleshooting is much easier if you
test as you go. The Phaser PC board is somewhat
complex in terms of component density, so even with
the excellent manual and the pre-labeling of parts,
there is always an opportunity to make a mistake or
the chance for a bad component. It’s best to take
your time and do the tests, just in case.
I needed about 6 hours to complete the kit PC board.
Final testing is simple. You just connect the necessary audio cables to your computer, connect your
antenna coax, apply transmit audio, and adjust a single potentiometer until the Phaser jumps to the transmit mode and starts generating RF output.
Note that the PC board shown here is the latest version. It incorporates a more robust bias switch than
on the original and adds a current-limit function to
cure an occasional issue with thermal overload when
builders ran the transceiver at more than rated output. The new board also adds a transmit indicator
LED to the board.
Phaser On the Air
You won’t need an interface between your
computer and the Phaser. The transceiver
design includes a voice-operated switch (VOX)
that keys the radio when sufficient transmit
audio is present. I used my Phaser with a laptop computer that provided only a headphone
output jack. That’s the case with most modern
laptops, but it doesn’t present an impediment
to using them with Phaser transceivers. All you
need is an inexpensive outboard sound device
that plugs into one of the laptop’s USB ports.
These devices are available for less than $20
from sources such as Amazon.
I fired up my WSJT-X software, configured it to
use the external USB audio device, and
selected “None” in the dropdown transceiver-selection menu. Phasers don’t provide CAT connections,
so I wanted to make sure the software wouldn’t throw
an error message after a futile attempt to communicate with a radio that wasn’t there.
The WSJT-X waterfall display immediately came to life
with FT8 signals and the software began decoding.
On 20 meters, with my Icom IC-7300 transceiver and
a vertical antenna, WSJT-X can decode FT8 signals
at my station down to about –24 dB. With the Phaser,
I was decoding signals as weak as –19 dB. Considering the fact that you’re running QRP, this level of sensitivity is more than adequate. After all, extremely weak
stations are unlikely to hear you anyway.
As usual, the FT8 watering hole on 20 meters was
packed with signals. When you’re operating at QRP
power levels, it can be a challenge to be heard in
such crowded conditions. I chose a relatively clear
spot in the waterfall display and began calling CQ in
the hope that someone would decode my 4 W signal.
You can stop here and use the Phaser PC board
without an enclosure. All connectors and controls are
mounted on the board and are readily accessible. If
you prefer your radio in a box, check out the optional
enclosure kit, shown in Figures 5, 6, and 7. This kit
uses interlocking fiberglass PC board panels
designed to be soldered together along the inside
mating edges, resulting in a sturdy case. The enclosure panels are finished with a smooth red solder
mask, and the front and rear panels have silkscreened labels. It took me less than an hour to build
the enclosure for my radio.
Reprinted with permisison; copyright ARRL.
After a couple of attempts, I finally received a
response from a station on the opposite side of the
continent. He gave me a –16 dB report, and I was
pleased; not bad for a few watts and a vertical
antenna. After finishing the contact, I checked the
PSKReporter map (pskreporter.info/pskmap.html)
and found that a number of other stations had
reported receiving my signal as well.
I decided to reprogram the Phaser’s frequency and
give WSPR a try. Reprogramming the Phaser’s frequency requires some practice; it isn’t as simple as
spinning a VFO knob.
www.arrl.org QST July 2020 47
FT8
There is a tiny pushbutton labeled
, which you
must hold down while powering up the radio. When
you release it, the
FT8
LED blinks twice to let you
know you’re in the frequency programming mode.
Next, you have to use the
FT8
and
ALT
pushbuttons
to enter the frequency by sending Morse code. The
FT8
button sends dits and the
ALT
button sends dahs.
As you can imagine, the odds of making mistakes
are very high. I needed several tries before I finally
achieved success. No matter how badly you mess
up, though, rest assured that the preprogrammed
FT8 frequency will remain undisturbed.
An Investment in Fun
While I would not recommend the Phaser for your
first kit-building experience, it should be well within
the abilities of most hams, including beginners with
some guidance. Several clubs have already purchased Phaser kits for group projects, which lend
themselves well to the Phaser’s thorough approach
to building.
The Phaser manual is available for download from the
Midnight Design Solutions website, so you can see
what’s involved in building and using it. The kit is well
supported with a very active Chat With The Designers
discussion group online at groups.io/g/cwtd.
Each kit costs just $55 and the optional enclosure is
an additional $25. So, for $80, you can own a singleband transceiver that’s perfect for portable operating.
This review was written while we were waiting for
Spring to arrive, but as soon as the weather warms
and the COVID-19 “stay at home” rules loosen up, I’ll
grab my laptop and take my Phaser to a park. With
just a simple portable antenna and a small battery to
power the Phaser, I suspect I will be making plenty of
contacts.
Manufacturer: Midnight Design Solutions, 205
Okema Trace, Loudon, TN 37774; midnightdesign
solutions.com/phaser. Price (not including shipping): Phaser transceiver: $55; enclosure: $25.
48 July 2020 QST www.arrl.org
Reprinted with permisison; copyright ARRL.
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