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Reviews Categories | QRP Accessories | KD1JV QBSA Help

Reviews Summary for KD1JV QBSA
KD1JV QBSA Reviews: 1 Average rating: 5.0/5 MSRP: $45
Description: Actual size, 3" long, 2.55" wide, 1.45" high.
• Digital Dial
• 0- 9.99 Watt power meter, Forward or Reverse power
• 2 Watt audio amp
• 6 to 11 volt variable voltage regulator
Designed primarily for use with the kd1jv ATS series rigs to enhance base station use of the rig, the QBSA can also be used with other QRP rigs. IF offset for producing direct reading digital dial is programmable and IF offset arithmetic operations are pin selectable.
The QBSA may also be useful on your work bench. The frequency counter is usable up to 45 MHz (100 Hz resolution), and the variable voltage regulator can deliver up to 1 amp of current if heat sinked.
Price - $45.00 No shipping or handling charge if paid by check or Money Order.

Product is in production.
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KX0R Rating: 5/5 Nov 23, 2007 22:40 Send this review to a friend
Great QRP Multifunction Accessory!  Time owned: 6 to 12 months
The QBSA is a multifunctional device designed primarily as an accessory for the ATS series of QRP transceivers, but it has many other possible uses. It provides regulated, adjustable voltage; counts the frequency of the radio; measures the forward and reflected RF power; and adds a 2-watt audio amp with a volume control. These features give the tiny ATS radio a larger, friendlier feel; when you use your ATS rig at home, the QBSA enhances your operation.

The ATS rigs are so small that there isn’t room for the circuits included in the QBSA; the QBSA is a “wish list” of enhancements. If you use an ATS rig for bare-bones portable work, you can plug it into a QBSA at home and enjoy additional features.

You get much for very little money with the QBSA kit. The pc board is a mix of easy surface mount and through-hole parts. The trickiest part of the assembly is winding the balun-core transformer for the RF power sensor. There is no case with the kit, so you have to devise your own. I ended up putting my QBSA in a spare BLT case, for which it was designed, and the metal work took longer than soldering all the parts. You also have to add some connectors and make cables to connect to your rig – the kit is limited to the functional board, controls, and display.

The QBSA requires an external power supply capable of delivering 14-16V at about 1A; regulated voltage and RF power will be reduced if only 12V is available, but all functions operate.

Building a QBSA is much easier than building an ATS rig. The detailed manual has good colored drawings and tips for dealing with a few challenges. Because there’s no enclosure, this isn’t a beginner’s kit; but it’s an easy project to follow assembly of an ATS radio. I thought it was fun!

Steve Weber provides a clear procedure to calibrate the QBSA using an ATS radio and minimal test equipment. Both the counter and the RF power meter must be adjusted.

Using the QBSA is easy – just plug in the connectors and operate. The 4-digit red LED display is bright and easy to read; the voltage control adjusts the power output of the radio; and you can read your frequency, forward power, and reverse power by pushing the function button. Since the ATS radios have no volume control, it’s nice to use the pot on the QBSA. You can feed your audio to headphones or to an external speaker – 2 watts of clean audio is available from the LM380. The RF meter functions well, and it agrees pretty well with my other gear. A 50-ohm RF load reads zero reflected power. It will measure up to 10 watts, and it’s useful for levels below a watt.

The QBSA is not limited to the ATS rigs. The counter can be programmed for various offsets with arithmetic needed to convert the measured LO frequency to the RF frequency seen on the counter.

The only thing I’d change is to add another function to display the DC output voltage.

This is another cool design by Steve Weber, and you’ll enjoy using a QBSA even more if you understand what it’s doing while it monitors your rig. It’s hard to give this kit only a 5 when it works so well!

George Carey Fuller

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