AZDEN PCS-7500H MANUAL PDF

Manual zz. A Zd en Corporation is the only manufactur- er of mon oband mobile FM tran sceivers for all the popular bands from 28 through MHz and really has a corner on the ma rkel for 6 and 10 meier FM rigs. For line. Because a quarter-wavelength at 6 meters is about 4'9" long, p eaks and nulls in signals are produced by c o nsid e rably more movement than, say, at2 meters, whe re a quarterwave is only about 19'. Plus, 6 meters enjoys occas ional F-Iaye r propaga tion, produc in g contacts to s everal thousancl miles wi th relatively low power d u ring solar-cycle peaks , If you haven't tried 6 yet, it is surely an inleresting band that has its share of die-hard users.

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Manual zz. A Zd en Corporation is the only manufactur- er of mon oband mobile FM tran sceivers for all the popular bands from 28 through MHz and really has a corner on the ma rkel for 6 and 10 meier FM rigs. For line. Because a quarter-wavelength at 6 meters is about 4'9" long, p eaks and nulls in signals are produced by c o nsid e rably more movement than, say, at2 meters, whe re a quarterwave is only about 19'.

Plus, 6 meters enjoys occas ional F-Iaye r propaga tion, produc in g contacts to s everal thousancl miles wi th relatively low power d u ring solar-cycle peaks , If you haven't tried 6 yet, it is surely an inleresting band that has its share of die-hard users. It is a fine -looking radiO, w ith every single panel button ill uminated w ith a dark o ra nge glow for easy viewing.

The LCD d isplay sc re e n is s im il a rly b a Ckli ghted a nd h as a warm , inviting glow. T he PC S22 73 Amateur Radio Today- Augusl H is rated to pro duce 50 watts AF output power w ith a 10 watt "low power" mode frontpanel se lectab le , programmable frequency steps, and other features normally found o n modern FM transce ive rs, The PCSH has good and bad points, and I'll try to discuss both fai rly.

I like thou ghtful touches, w ith which the Azden is load ed. For example, they used a flat-blade automotive-style fuse in the DC power cable. Small point. I also like the connectorized power cable, whid1 uses a n automotive-style molded connector set that has also proven its reliability in years 01 service.

Its coaxial antenna cable receptacle, a stanclard "UHF" , is lirmly mounted to the rear panel 01 the rad io, not hanging o n a short coax extension c a b le as in many modern mobile rig s. It s ha nd -held PIT microphone has a solid leel and produces excellent transmit a ud io, More o n this ta te r. And the rig is beautifu l, especially at nig ht when one can enjoy all the warmly lit controls.

I al so like the built-in heat-sink fan in the PCSH , It a ctivates after a few minutes of continuous transmission at norma l ro om temperature a nd helps m aintain a "coot-totne-toucn" heat sink, undoubtedly pro longing the operating lite of the final amplifier stage. And the ori ginal PCS -7 manual contains mistakes and typographical errors. Most aren't meaningful, but I started 10 proolr ea d the man ual in sea rc h o f erro r s a n d stopped w hen I found a d ozen by the fourth page.

Azdan did provide me with an updated sheet entitled, " Error in Azden PCSH Instruction Manual" which does describe how to use a Pl tone in the "Direct" mode, but the procedure is so complicated it couldn't possibly be performed while driving. No big deal, although simply calling them or might have been nicer. But the rig always "powers up" on memory AO, regardless of where you used it last.

This is frustrating, especially si nce all my other modern FM transceivers "remember" where they were last used and "power up" on the last-used channel.

The only way to go from. And if you depress the "up" or "down" button more than momentarily, the rig begins scann ing through the memory channels very quickly, much too fast to stop on the channel of your choice. With the technology and chip sets available today, there's no reason for any channelized radio to not have "direct frequency entry" with keypad strokes.

That is. In Azden's defense, however. I must admit that many modern FM mobile rigs still don't contain this feature. Darned if I know why not. That is, the CTCSS frequencies, of which there are 38 in common use, are not actually displayed by the Azden during the Pl selection process.

Instead, tones are selected and displayed by two -digit codes which might only be memorized by The Amazing Kreskin. Since I'm not so amazing, I had 10 constantly refer to a chart on page 14 of the instruction manual to determine which twodigit code corresponded to each Pl tone frequency.

For example. Sid Wolin at Azden in New York did advise that the newer-generation PCS series unavailable at this writing would incorporate a new microprocessor which allowed direct Pl frequency address and readout, as on their handle-talkies. Programming the PCSH takes some getting used to if you are more familiar with one of the other brands of equipment.

It's not difficult, but might be too complex for use "en the fly" while driving. But the Azden inst ruction manual makes the job sound more difficult than it is, with 12 paragraphs assigned to the description.

The Azden is unique in that it only stores the memory data when you turn the rig off, and then back on. To quote from the manual, "Note: Be sure to turn off the power when you have completed programming. This procedure is required to get each setting pregrammed in and then to get out of the programming mode. With all these quirks to write about, you may get the idea that I really don't like the Azden.

This Isn't true. I do like the rig, but it took more getting used to than it should have. In terms of performance, the Azden is an impressive package. The Technical Side One thing I like a lot is that Azden provides "lull-sized" schematic diagrams for thei r rigs. They are clear and easy to read without a magnifying glass, and wlll be of value to those who like to perform modifications or do their own service work.

I like the discrete approach better because it is more user-serviceable for reasonable cost. Not that I would expect the final to fail; the people at Azden assured me they've never seen one fail yet.

The PA circuit board also contains a discrete driver stage 2SC , the t herm al detector which switches on a cooling fan if the heat-sink temperature gets too hot, the VSWR protection detector c ircuit which shuts the transmitter down if a gross antenna mismatch occurs , and a bandpass filter ci rcuit which is in line with the antenna to both the receiv er and the transmitter.

PA stage tuning is accomplished by a three-section low-pass matching network. One drawback to the discrete PA stage is Its cr itical tun ing: The PCSH does de liver 50 watts as rated into a perfect 50 ohm resistive load, but power output falls off rapidly when the transmitter is faced with any mismatch at all. Some of the "brick" stages, while COStly to replace, are more forgiving of mismatches.

The recelv- er isn't razor-sharp, but suffices nicely with the 20 kHz channel spacing common ly used on 6 meters. One might think that a VHF rig with a lirst IF at 14 MHz could be easily interfered with by strong 20 meter signals, but I didn't find this to be a problem.

However, I've never been able to tell the differen ce between "t rue FM" and "phase modulation," since, mathematically speaking, one is the reciprocal of the othe r a nd a phase -modulated signal, when integrated, becomes " FM. Azden was surprised to hear this, and immediately shipped a new microphone, thinking that was likely to be the problem.

It was, and t he new microphone produced clear, crisp modulation that received compliments on the air. I must say, Azden's service in this instance was remarkable. They must have shipped the new mike the day I called them on the telephone, because I received it the next day, 3, miles away! One thing I think is a bit "clunky" about the Azden is that it uses an old-fashioned relay for transmi t-receive RF switch ing.

Relays work fine, and Azden claims they've never had one fail, even in prolonged packet radio service, but their switching "turnaround" speed is rather slow compared with solidstate switches, and if the radio is used for packet, the user may have to re-set switching parameters in his TNC program.

I was used to using 30 milliseconds mS or less in packet switching, but this is too fast for a relay. I'd recommend more like mS for a relay-operated rig. There 's not a lot of packet activity on six anyway, but if you really wanted to, you could ho me-brew a PIN diode modification fairly easily. A listing of manufactu rer's ra tings vs.

It does have quirks, as described earlier, that make it more troublesome to use than I'd like. But for an affordable, single-band 6 meter FM rig, it's almost the only game in town.

Same goes for 10 meters, with the PCSH. I understand the Southern California Six Meter Club, which actively promotes the use of this band , has ordered a great numbe r of these radios for their members and they are well accepted. In speaking with local 6 meter repealer owners,!

It does disturb me a bit that th e t ran sm itter po we r output fa lls off so sharply when connected to other than a perlect load, but since the FM subband on 6 mete rs is a narrow window of our spectrum 3 MHz , I suppose anyone with a lick of sense could tune his antenna to provide a good match if he had to.

The radio as reviewed is good. With the improvements Azden has planned, such as eliminating the twO-digit Pl tone codes, it will be even better. SA RX For comparison purposes. At 50 MHz, the difference in lhis specification for anything less man 1 flV is not critical. Items unspecified by manufacturer, but noted: Display window bar graph, number of bars illuminated for 50W TX output: Display-window bargraph used as RX S-meter, number of bars illuminated ve.

This makes the resolution extremely good for weak signal beam peaking. Not uncommon for FM receivers. Bmm diameter. Th leads on lhese devices have been lfimmed to 0. I aving plenty 01 room lor soidering. Scales in green. Th ree AC and three DC vol! Includes mounting ha rdwa' Six Meter Heliax Duplexers. Ham Radio Magazine Contents - Creative Sales Resource Inc. FMX Instruction Manual. Section 8A. Section 2 - Camcorders Accessories. Download PDF advertisement. Its a community-based project which helps to repair anything.

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Azden PCS-7500H

While the user is listening to any other channel the. PCSH Transceiver pdf manual download. Here you will find instruction manuals for current Azden products as well as some out-of-production legacy Product Manuals. Categories: Microphones Downloaded by

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