I have recently acquired two Heathkit Single Banders, a HW-22A and a HW-32A, with which I am quite intrigued. The HW-22A was in bad shape and did not work at all. The receiver now works great and I should have the transmitter going soon. I am starting a new page on which I will present some of my experiences and findings as I work with the old rigs. If you have one of these, I would be please to receive an email from you.

The SMART Keyboard is no longer available. My supply of PC boards has been exhausted and the demand has dropped to the point where procuring a new batch of boards does not seem prudent. If you want to build the interface, send me an email. If I receive enough requests, I will procure a new batch of boards.

Don, ND5P, has installed the N4YG DDS system into his R4B. You may see his "R4B DDS Installation" by clicking here. In Don's words, "Joe this combination (DDS & Drake Twins) is awesome, using the R4B as the injection source for the T4xb, you have 15 bands available RX & TX. Also with the split function of the DDS you can still run the T4xb split".

New DDS boards have arrived. The only change from the DDS2011 board is the incorporation of the cascaded output amplifiers to provide approximately 5 dB of additional output. For those who are installing the N4YG DDS into an old transceiver (Ten Tec, Drake, Heath, etc.) there is no net change. I am ready to take orders. Thank you all for your support. I am glad to hear the many favorable comments.

If you have a Standalone VFO which incorporates the DDS 2011 board, you will be interested in this. A mod to the output amplifier circuit provides approximately 5 dB of additional output, depending on your particular boat anchor transmitter. This mod will be incorporated into a new PC board which will be coming soon. The mod is described below and requires only 5 resistors and a capacitor. You may request these parts by emailing me and they will be sent to you free of charge. The circuit diagram for the revised circuit is shown below.

To incorporate this mod into your 2011 board VFO, complete the following steps:

1. Cut the trace on the bottom of the board between pin 3 and pin 5 of the LT1253.

2. Change resistors R12, R13, R14 and R15 to 1K, 150, 470 and 220 ohms respectively.

3. On the bottom of the board. solder a 1000 pF capacitor (C34) between pin 1 of JP7 and pin 5 of the LT1253.

4. Solder a 33K ohm resistor between pin 5 and ground. Ground is where R11,15,13 and others come together.

5. Unplug connector J7, rotate it 180 degrees and plug it back in. This causes you to take the output from the other amp.


If you have the still older 2010 board, you will need an additional 1000 pf capacitor to complete the mod for which the schematic below is applicable.

To incorporate this mod into your 2010 board VFO, complete the following steps:

1. Cut the trace on the bottom of the board between pin 3 and pin 5 of the LT1253.

2. Change resistors R9, R10, R11 and R12 to 1K, 150, 470 and 220 ohms respectively.

3. On the bottom of the board. solder a 1000 pF capacitor (C28) between pin 1 of JP7 and pin 5 of the LT1253.

4. Solder a 33K ohm resistor (R14) between pin 5 and ground. Ground is where R10,12,13 and others come together.

5. Solder a 1000 pF capacitor (C29) between pin 7 of the LT1253 and pin 4 of JP7.

6. Connect pins 2 and 3 of JP7 together. The easiest way is to make a solder bridge between the two pins.

7. Unplug connector J7, rotate it 180 degrees and plug it back in. This causes you to take the output from the other amp.

We are now offering a new and novel DDS product. It is an audio DDS, yes, a DDS that outputs audio frequencies. It has 2 current applications. The first is a sidetone to replace those awful, raspy sounding sidetones which were often found in early Ten Tec rigs and others. The second is a nice sounding code practice oscillator. What's so good about this system? In short, the nice sound that you get from it. It outputs a sine wave with very low harmonic distortion and a keyed waveform with digitally shaped leading and trailing edges which remove clicks completely. You may read about it on the Corsair WIKI. site. The cost of the sidetone kit, specifically designed for the Corsair II, contains all parts and a PC board is $24 and the Code Practice Oscillator kit is $30. Click "here". for more information.

I have constructed a remote VFO which I am currently using with my Ten Tec Corsair II. It performs better than I had ever hoped. Here is just a little snapshot of it. 1) It is plug-n-play with the Corsair II. All you have to do is plug in the accessory cable and the VFO IN and VFO OUT cables. It gets its power from the Corsair's supply. 2) It has an optional LCD readout to 1 Hz and it can be calibrated to an accuracy of about 20 Hz when the simple band encoder is implemented in the Corsair. 3) It has dual VFOs, A & B. 4) It switches between the internal PTO and the A & B VFOs. 5) It works split with its internal VFOs or split with the PTO and the A VFO and it also works split with its A and B VFOs. 6) It allows simultaneous reception on two frequencies, the PTO frequency and the frequency of the A or B VFO. 7) It has RIT and XIT. We will post the plans for this great little VFO soon and offer it along with the other application options for the N4YG DDS system.

The article "Direct Digital Synthesis For Those Classic Rigs". by N4YG appeared in the June 2011 issue of QST.

I am always interested in your suggestions, so feel free to let me know what you think could be better about anything you find on this site.