Digital Mode Transceiver




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Documentation (rev A10):

     Phaser-80 Manual

     Phaser-40 Manual

     Phaser-30 Manual

     Phaser-20 Manual

     Phaser-17 Manual

     Enclosure Manual

     Troubleshooting Manual


    Versión para 80 m
    Versión para 40 m
    Versión para 30 m
    Versión para 20 m
Kit de caja


Round 1 (100 kits): 
   All shipped by Jan 4

Round 2 (100 kits):
   All shipped by Jan 16

Round 3 (100 kits):
   All shipped by March 9

Round 4 (125 kits):
   Taking orders!

Spanish translations by EA2SN
... Thank you Jon!

Dateline: April 6

Round 4:  Order log now filled for Round 4. The kitting engine is at full steam  and  we should be ready for the PCB boards when they arrive on/before April 15! 
Round 5: We've have now started taking orders for Round 5, which have a 'TBD' shipping date until we get the next round of PCBs ordered.


The Phaser Digital Mode Transceiver
is a single-board, 4-watt SSB radio specifically designed for using digital modes with computers running WSJT-X, DigiPan, FLDIGI and most other digital mode applications.

See the 7-page article in CQ Amateur Radio Magazine for Feb 2020 ...

A Single-board, 4-watt
Digital Mode SSB Transceiver
for 80, 40, 30, 20 or 17 Meters

... designed by Dave Benson, K1SWL

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)

      * FT8 frequency hard-coded

      * Alt frequency soft-coded to JS8, user reprogrammable

Tx operation: Phasing SSB

Tx power output:  4 Watts (nominal)

Receive MDS: -109 dBm

Adjustments:  Tx Drive

Frequency Calibration: 1-time

User Programmable ‘Alt’ frequency: 100 kHz to 30 MHz, 1 kHz resolution
                                                        No external interface required.

Dimensions4.125” x 3.85” x 1.20”

DC Power: 12V @ 130ma (Rx), 1A (Tx)

SMT components:  7 (pre-installed)

Kits:  All version available: 80m, 40m, 30m and 20m

Enclosure: Kits optionally available


NEWS! ... University of Tennessee ARC

N2APB present Phaser #001 to the University of TN Amateur Radio Club. This first Phaser was assembled and generously donated to the young hams of UTARC by Ken Hopper, N9VV.  Thank you Ken!

Click on photos above to see larger view.



Photo Gallery:


Graham VE3GTC controls Phaser #176 frequency using Arduino

for CAT control from FLDIGI.
Also reports WSJT-X control of Phaser using HAMLIB
and manually via RIGCTL.


Jim N3VXI shows off his Phaser #177 controlled by Raspberry Pi

First contact on Monday April 6, 2020


Gwen NG3P shows off a STUNning view of her 4W Phaser.
(Note the Tx Indicator LED mod on front panel)


Initial contact at TLARC Group Workshop in November!


K1SWL's Family Photo (Phaser-80, -40, -30, -20)



First 17M contact with Phaser-17, by K1SWL  (click photo)


80M conditions at dawn East Coast U.S.

 (No Europeans, since it's midday there.)



K1SWL working Belgium


First Contact! (Sam KV4XY) ... Click photo

(Note the mic input to PC is too hot ... Must reduce mic gain.)






The Phaser is capable of transmitting and receiving on the 80m, 40m, 30m, 20m or 17m amateur bands.  Each of these monoband transceivers is programmed to operate first at the popular FT8 frequencies, while a pushbutton entry shifts the operating frequency to an alternate frequency of the user’s choice, initially provided at the JS8 ‘watering hole’.  This ALT frequency may be easily reprogrammed to be anywhere in the HF spectrum, thus providing frequency flexibility to accommodate other digital modes such as PSK31, JT65A, WSPR, Feld Hell, Olivia, SSTV, etc.

To ensure efficient use of spectrum in operation, the transmitter features an adjustment-free phasing single-sideband (SSB) design.  The use of precision components provides unwanted sideband suppression in excess of 30 dB across its operating range, thus minimizing inadvertent QRM to other operators on the (unused) lower sideband.  The use of SSB also eliminates the issue of out-of-phase signal cancellation at the Phaser's direct-conversion receiver. As such, it allows Phaser users to communicate with each other.  This is a clear advantage over the use of 'entry-level' double-sideband (DSB) transceivers.


Phaser hookup diagram showing simple interface to the PC running WSJT-X


Group build-a-thon workshop at our Ham Radio Club

In order to thoroughly test the design of the PHASER, we conducted a group build-a-thon workshop with the local ham radio club here in Tennessee ... Tellico Lake Amateur Radio Club (TLARC).

Ten hams participated in the workshop, with kitbuilding skills ranging from novice-to-medium.  The PHASER kit was designed to be assembled using only through-hole parts (seven surface mount devices come pre-assembled on the PCB), so construction was straightforward while carefully following our good assembly guide.  We had reserved two afternoons that weekend to complete the kits, and by the end of the second session five hams had successfully completed and tested their PHASERS and immediately got on-the-air to achieve their first digital mode contacts!  The others needed some extra time to finish their assemblies but were on the air later that week.  Soldering skills were honed during the club workshop, and everyone came away with newfound talents for winding toroids.

See below for some shots of our workshop:




Download PDF of "Phaser Schematic, Page 1" ... 80m/40m and 30m/20m and 17m


Download PDF of "Phaser Schematic, Page 2"



(Separate/Optional Purchase)


This a custom Enclosure Kit for the Phaser Digital Mode Transceiver. The kit is comprised of interlocking fiberglass panels designed to be soldered together along the inside mating edges, thus providing a strong and attractive case for the Phaser.  All panels have red soldermask to present nice, shiny surfaces, and the front and rear panels are silkscreened with labels for all the included controls and indicators. 

The Enclosure Kit includes all parts pictured in the lower-right photo, and can be assembled in about one hour.  The Enclosure Assembly Manual may be downloaded from here.


~ Click on any photo here to see full-res view ~






Enclosure Kit all packaged and ready to ship!



Phaser Kit Parts Cards


Bag 1 and Bag 2 all packaged up and ready to go!



Nine (9) cards in all ... Stack 'em up in a card file, small shoe box, old cigar box, or whatever to provide easy access to the parts when called for in the Instructions!

(This unique parts management system is the brain child of master kitter Larry K3PEG with its genesis coming from kitting up many projects for NJQRP, AmQRP and Midnight Design over the years.)





(Coming Soon)





Phaser-80:  $55  (PCB & Parts Kit for 80 meters) ..........
Phaser-40:  $55  (PCB & Parts Kit for 40 meters) ..........
Phaser-30:  $55  (PCB & Parts Kit for 30 meters) ..........
Phaser-20:  $55  (PCB & Parts Kit for 20 meters) ..........
NEW! ==> Phaser-17:  $55  (PCB & Parts Kit for 17 meters) ..........
Enclosure Kit:  $25 ..........


 Automatically added when checking out:

US: Priority Mail = $10  (3-5 business day delivery)

DX: First Class Mail = $30 (10-20 business days  )

For Expedited DX Shipping (6-10 business days)Additional $30  ....  


... OR ...


Check or Money Order:

 Midnight Design Solutions

205 Okema Trace

Loudon, TN 37774  USA



Fine Print
Prices, availability and product specifications are subject to change at any time.
Customers accept all responsibilities for following safe and approved assembly practices and product usage.
Orders are typically shipped within 1-2 weeks due to order preparation.
All orders are acknowledged by email, usually within 24 hours.  If acknowledgement is not received, please contact N2APB directly.

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Page last updated:  March 9, 2020