Endorsements Available for Ø7Ø Club Members


The Ø7Ø Club offers special endorsements to acknowledge the achievements of the active PSKer and to spiff up that membership certificate as well. See below for general guidelines and instructions on how to get these nifty add-ons.


KJ4IZW's Ø7Ø Award Checker Program


General Guidlines for Ø7Ø Club Endorsements

  • 1. All endorsements are free and offered to Ø7Ø Club members only.
  • 2. Unless otherwise noted, all contacts must have been made after 1 June 2ØØØ using PSK31 mode on the HF bands (16ØM thru 6M).
  • 3. Unless otherwise noted, membership in the Ø7Ø Club at the time the contacts were made is not required.
  • 4. Unless otherwise noted, all endorsements have no expiration date.
  • 5. Please use the Online Endorsement Checker! This will process your ADIF log file, applying the rules for all of our endorsements and awards. After that, it will automatically submit any new qualifying items to the approval queue!!!  You'll then see your newly approved awards the next time that you upload!
If you have questions or issues, email  This email address is being protected from spambots. You need JavaScript enabled to view it.




The Ø7Ø Club maintains two email reflectors for our members on the Groups.io user group service.  They are our primary means of communication of club business to our members, so we encourage you to sign up!


Our main group is located here: groups.io/g/070Club

  Join by sending an email to: This email address is being protected from spambots. You need JavaScript enabled to view it.


Our contesting group is located heregroups.io/g/070ClubContests

  Join by sending an email to: This email address is being protected from spambots. You need JavaScript enabled to view it.


Please submit application emails to the EMAIL addressess above. Please include your Ø7Ø Club member number and callsign in your request email.




This page is not intended as a complete tutorial covering all facets of PSK station configuration. Instead, it is intended to be a quick overview providing links to other resources. It presumes you understand PSK operation at a basic level, consistent with the Ø7Ø Club's Intro to PSK page.



PSK Hardware

The classic PSK hardware configuration is a computer with sound card, an SSB transceiver, and an interface between the two (for audio signals and sometimes Push-To-Talk or PTT).



Virtually any SSB transceiver (or transmitter/receiver pair) can operate PSK if it has adequate frequency stability. Since the PSK signal is only 31 Hz wide, radios that drift more than a few Hz will be hard to track.


One generalization is that if your radio has DATA input/outputs, you are probably better off using them than using the MIC input and SPKR output. Not only can you leave your mic and speaker connected, but there are usually different gain settings for the DATA input (allowing you to keep the MIC gain set for your mic, and the DATA gain set for the computer's output), and the MIC input is often disabled when DATA PTT is selected (so your mic doesn't transmit room noises along with your PSK signal).


Small Wonder Labs has developed a series of PSK-only transceivers. Kits have been available for 80, 40, 30,20 and 10 Meters. Check with SWL regarding current availability.


Steven "Melt Solder" Weber, KD1JV, has just developed a design for a bare-bones "Unique PSK Transceiver" for 20M. This was recently reported on QRZ; design details are on Steven's page.



The basic requirement for a computer is sound input/output connections and the ability to run the software you want to run. Each software package has its own minimum requirements - refer to the web sites for each individual software package for its minimum configuration.


PTT operation can be handled in multiple ways. It's possible to use your radio's VOX circuits in some cases. The "classic" approach has been having the software trigger the RTS or DTR line on a conventional serial (COM) port, and using this to activate PTT. It's also possible to use a USB connection, though some software is not configured for this. And some software can use CAT commands, using an existing serial (or USB) connection between the computer and radio that you have for rig control. You'll have to figure out what works for your exact hardware/software combination, but be advised that some combinations may require a conventional serial port.


Milt, W8NUE, has developed an alternative to a computer. The NUE-PSK digital modem is a self-contained interface and modem, requiring only an external keyboard. More details are available on this kit from the AMQRP web site.


Some PDAs may have enough processing power and audio in/out capability to run PSK software. One of the more impressive demonstrations of this was Ken, WI7B's use of an AT&T Tilt cell phone as described on eHam.



There are lots of interfaces available - I won't try to describe the pros and cons of each. Some work better for some radios that others. Some preserve the MIC and SPKR connections, while others usurp them. Some have built-in VOX, or accept USB inputs, or even include a sound card (so they don't take over your computer's). This is just a list of ones that I have seen mentioned (in a positive way) recently.


Buxcom Rascal

US Interfaces Navigator




Saratoga EZ-PSK

Tigertronics SignaLink


There are lots of DIY examples you can find if you Google the phrase "PSK interface". If you want to homebrew your own, a good place to start is Ernie, WM2U's web page.


Other Accessories

A number of "signal monitors" are available that purport to help you keep your PSK signal adjusted properly. Some people swear by them, others swear at them. Here's a list without commentary, so you can form your own judgments.



IMD Meter



There are many PSK software packages available. Many of the Windows packages use the PSKCORE.DLL "PSK engine" developed by Moe, AE4JY. Most of the differences are in the user interfaces, the "look and feel" of the packages. Many are freeware, some are shareware. Try out a few and make your decision.




DM780 (part of the Ham Radio Deluxe package)



MultiPSK (French site; English mirror site)

WinPSK (mostly a prototype of how to use PSKCORE.DLL)

WinWarbler (part of the DX Labs Suite)


Zakanaka (part of the Logger32 family)














Internet Services





Many thanks to Steve, W3HF, for this page.



PSK operators tend to hang out at certain frequencies on the bands. Some of the frequencies are dependent on the location of the station, due to local regulations or QRM. Here are the most common:




Frequency kHz


1807 (USA)


1838 (Europe)




7070 (most popular)


7040 (Europe)


7028 (Japan)














50290 (USA)


50250 (Europe)





Almost all of these are the transceiver settings for USB operation, so most PSK signals are within the 3 kHz above these frequencies. (80M operation tends to be both above and below 3580, and there's always W1AW's code practice to avoid at 3581.5) By convention, BPSK is symmetric, you can also operate in LSB mode - just set your transceiver 3 kHz above these frequencies. (If you operate QPSK you'll have to use the "invert" setting in your software.)


Back in the early days of PSK31, the suggested operating frequencies all ended in ".150 kHz". This was at a time when tuning was done using the transceiver. Now that all PSK software is "click and tune", this level of detail is unnecessary. In fact, you only need to set your transceiver "near" the above frequencies, where "near" is defined as within a few hundred Hertz - you'll be able to tune in most of the activity with your software. But don't forget to tune around a bit when the waterfall is very active, as some stations may be operating outside of the "normal" range when there are a lot of stations on the air.


When you are operating USB, your actual transmitted frequency (the actual frequency of your PSK signal) will be equal to the sum of your transceiver setting plus the audio offset displayed in your software. Some people prefer to quote this as a sum, as in "14070 + 1200" for a transceiver set at 14070 kHz and a 1200 Hz offset. Others will state this as the sum itself, 14071.2 kHz. Both of these are exactly the same, as would be someone working the same station with a transceiver set at 14069.5 kHz and an audio offset of 1700 Hz. Note that if you are using LSB, you have to subtract the audio offset from the transceiver frequency. For the exact same operating frequency as above, an LSB station may be set at 14073 with an audio offset of 1800 Hz, which could also be quoted as "14073 -1800".


Many thanks to W3HF for the bulk of this page. The comment about W1AW came from K8IJ.