Azden Pcs 7000 Ctcss Tone Encoder

Julieboard S DATA (P1-2)

The connections on P3 can be made directly to the Julieboard via a cable or via wire-wrapped jumpers bridging P3 to the DB25 connector (PI), Note that the physical wiring differs for male vs. female DB25—examine the chosen connector carefully and locate the right pins, (The ground connection need not be made if a DB25 of either sex is used,)

The single in-line connectors are cnd-stackable, so some connectors could be partitioned into two smaller connectors. For example, "P6" could be implemented with a 4-pin connector to brine in the 4-bits BCD from the switch matrix and a 3-pin connector to bring out the spare two Port. B bits and ground. This allows a more modular system where the thumbwheel switch cabling is completely separate from the cabling to those two spare bits. Likewise, connectors P2 and P3 may be partitioned into subsets,

Note that Julieboard signals ENPHACC SHIFTER and BANKSEL arc not presently used, but could be in future versions-One advantage of using the DB25 is that an oppositc-sex multiple DB25 "backplane" arrangement can be used to allow addition of future boards to the set, (For example, a

T-R adapter/amp board and updated software will allow me to use this combo in VFO service for my ALlas 210 transceiver.)

My favorite use for the stand-alone combo is as the LO lor a tunable mixer. I have a Mini-Circuits SRA-i mixer in a RNC-equipped box; The RF port goes to the antenna, the LO port goes to the Julieboard, and the IF port goes to a surplus crystal-controlled SSB/AM receiver tuned to 6.300 MHz. 1 program the Julieboard to produce an output 6,300 MHz above/below the desired frequency, set the proper sideband, and T . , voila! Someday, I will mod the software so I won't have to do the frequency offset in my head.

Of course, this controller is suitable for controlling things other than just Julieboards, For example, one of the newer high resolution D/A converters could be driven to make a digital power supply or voltage source. How about -16.384V to -M6.383V adjustable in 1 mV steps via thumbwheel? Or one of the new PLL chips and thumbwheels for a synthesized 6m or 2m rig?

There is no reason why the processor has to be a '6805 (or even a Motorola device}. For example, PIC chips are available via DigiKey. and one quite intriguing product is a "BASIC stamp" which runs BASIC programs kept in an on-board EEPROM

and is about the size of a large postage stamp.

What's Next?

1 plan to evolve my design as I go, and add (in rough order):

•External BCD display via '595 shift registers.

•Option for up/down non-mechanical tuning.

•SCI support {remote operation via serial port). •EEPROM support. •Offsets for use as transceiver VFO.

Conclusions

I have had the stand-alone controller running the Julieboard DDS synthesizer in my shack for several weeks and am very happy with it. I can't wait to incorporate it in my portable QRP transceiver project. Right now, 1 have the best of both worlds—if I need special programming functions, the Julieboard can be unhooked and reconnected to the PC; otherwise, it is left attached to the Kendraboard for general purpose operation. Not having to wait for boot-up is great and there is a noticeably lower RF noise level vs. the PC.

Personal Note

Why "Kendraboard"? Readers familiar with the "Julieboard" article will recall that Julie had two (now three!) sisters and that they expected equal treatment. Kendra thought that naming the controller after her was a great idea. Now Karen wants to know when I'm going to do her board ... ES

"Not having to wait for boot-up is great and there is a noticeably lower RF noise level vs. the PC."

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The Azden PCS-7500H 6 Meter FM Transceiver

50 watts on 6 in an attractive, low-cost mobile.

Azden Corporation 147 New Hyde Park Road Franklin Square NY 11010 Telephone: (516) 328-7501 Fax (516) 328-7506 Orders (800) 643-7655 Price Class: $389

Azden Corporation is the only manufacturer of monoband mobile FM transceivers for all the popular bands from 28 through 440 MHz and really has a corner on the market for 6 and 10 meter FM rigs. When given the opportunity to review the new PCS-7500H 6 meter FM righ I was happy to jump right on it, since the 50 MHz band is full of FM simplex and repeater activity here in Southern California.

Six meters is a unique band that combines the propagation advantages of both VHP and HF For Jine-of-sight (direct wave) work, 6 is not much different from 2 meters or 135 cm (222 MHz), although the longer wavelength produces less rapid signal strength flutter. Because a quarter-wavelength at 6 meters is about 4 9" long, peaks and nulls in signals are produced by considerably more movement than, say, at 2 meters, where a quarter-wave is only about 19V Tropospherically-en-hanced propagation, especially "Iropo ducting;' occurs ¡ess on 6 than on 2 or the higher frequency bands, making those occasional DX contacts a bit more rare; however, the 50 MHz band does afford its users much more frequent sporadic-E (uE-skip'h) propagation, especially from May through July, and again in December, and 1,200-miie QSOs on 6 meters are not rare. Plus, 6 meters enjoys occasional F-layer propagation, producing contacts to several thousand miles with relatively tow power during solar-cycle peaks, if you haven't tried 6 yet. it is surely an interesting band that has its share of die-hard users.

Overview

The first thing anyone notices about the PCS-7500H (or any of the new Azden PCS-7000 series) is how incredibly beautiful it is to look at. It is a fine-looking radio, with every single panel button illuminated with a dark orange glow for easy viewing. The LCD dispiay screen is similarly backlighted and has a warm, inviting glow. Even the push buttons on the DTMF ("touch-tone") microphone are all illuminated; a nice touch. The rig comes equipped with a convenient and sturdy mounting bracket, a PTT/DTMF microphone, a long DC power cable with the positive side fused, a connector disconnect point about eight inches f rom the rear of the radio, and all mounting hardware. It also comes with a CTCS5 ("PC) encoder built in. The PCS-

7500H is rated to produce 50 watts RF output power (with a 10 watt "low powei^ mode frontpanel selectable), programmable frequency steps, and other features normally found on modern FM transceivers.

The PCS-7500H has good and bad points, and 111 try to discuss both fairly. I like thoughtful touches, with which the Azden is loaded. For example, they used a flat-blade automotive-style fuse in the DC power cable. Small point, but these have real advantages over the old-fashioned 3AG, AGC, MDL (etc.) glass cartridge fuses used in most other equipment: Tfcey can really handle a lot of current without thermal meltdown, are readily available at gas stations, and are very inexpensive. I also like the connectorized power cable, which uses an automotive-styte moid-ed connector set that has also proven its reliability in years of service. Its coaxial antenna cable receptacle, a standard "UHP' SO-239, is firmly mounted to the rear panel of the radio, not hanging on a short coax extension cable as in many modern mobile rigs. Its hand-held PTT microphone has a soiid feel and produces excellent transmit audio, (More on this later,} Its receiver audio is full, loud and undistorted, and sounds better than many mobile rigs. And the rig is beautiful, especially at night when one can enjoy all the warmly lit controls. The Azden can accommodate any frequency "split" between transmit and receive, since each channel can be separately programmed (into memory) with TXyRX frequencies, and its 20 memories are adequate for 6 meters. As with all modern FM

rigs, each memory will store frequency "split" and PL tone (if required).

I also like the built-in heat-sink fan in the PCS-75G0H. It activates after a few minutes of continuous transmission at normal room temperature and helps maintain a "cool-to-the-touch" heat sink, undoubtedly prolonging the operating life of the final amplifier stage.

On the other hand, the Azden is full of quirks, some of which I found a bit annoying. First the PCS-7QG0 series aJ) seem to share one instruction manual* written around the PCS-7000(H) 2 meter rig. The PCS-7500H manual contains an "addendum" sheet (one page) which modifies the PCS-7000 manual to suit the 6 meter rig. but this means referring back and forth between two sets of information , And the original PCS-7000 manual contains mistakes and typographical errors. Most aren't meaningful, but 1 started to proofread the manual in search of errors and stopped when I found a dozen by the fourth page. This reminded me of how badly written the older Japanese equipment manuals used to be, before the manufacturers employed English-speaking technical writers to make them better,

Next, there is no easy way to use the rig with tone-activated (CTCSS) repeaters when in the "VFO" or "Direct" mode. PL-tones are easily programmed into memory, and once this is performed, tone-activated repeaters are easy to use; but if you're "scanning around* looking for activity in an unknown region and stumble across a tone-activated repeater not already in memory, theres no easy

Azden Pcs 7000

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    HOW TO SET PL TONE ON AZDEN HANDHELD?
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    How to program frequencies into azden pcs 7000?
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    Is Azden PC7000(H) an allmode rig?
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