A M

1. RepJace coils with lossless linear loading

2. Fold back and symmetrically place linear loading for mechanical strength and balance,

3. Extend element to 1/4 wave on 15M. Fold back and decouple tip wiih C2

4. Extend Tip for 20M Tuning of 15and2GM is independent

The FRB- 707 relay box.

enough heat-sink area to dissipate the heat produced in nor* mal operation. We never pushed the finals hard enough during any of our tests to cycle the ther mal shutdown device.

On the Air

Operating the 707 is a pleasant and rewarding experience. Its no*tune-up design permits in* stant operation. Adjust the mike gain on SSB or the carrier level for CW to proper levels as indicated on the front-panel meter, and you are ready to go! Hams who have never operated a solid-state rig are in for an agreeable surprise.

While searching for DX on 20 meters one night, I noticed that tuning in individual signals seemed relatively easy with the 707. Sure enough, when compared to several other popular rigs gracing the 73 ham shack, the 707 came up with noticeably wider band spread, The only rig in our possession that performed better in this respect was the Icom IC-7Q1, whose digital tuning gives it an unfair advantage.

Selectivity is very good, with two eight-pole i-f filters standard. 600Hz and 300-Hz CW filters are available as options. The 350-Hz filter was installed in our unit; switching it in provides a startling reduction in interference. Hams who enjoy CW (and Novices In particular) should consider a sharp CW filter necessary equipment for any receiver The M width control is active on both CW and SSBP with performance comparable to other rigs having a similar control

If you have always yearned for a rig that would allow you to check into an 80-meter AM

phone net, or check out the action on 10-meter AM, you are reading the right review! Seriously, with the high level of in* terest in converted CB equip ment, the AM feature allows entry into a world that is denied to owners of many other modern transceivers.

The quality of the manual also bears mention. For whatever reason, manuals for Japanese ham gear do not enjoy a particularly good reputation among hams in the USA. Well, I'm

pleased to report that this is one of the good ones, Whi le obviously written by someone for whom English is a second language, the instructions are perfectly clear and understandable.

Servicing information is pretty good, too. We are provided with complete schematics, block diagrams, and a very good circuit description, For those with access to good basic test equipment, there is a section on maintenance and alignment. We haven't seen too many manuals better than this for any trans* ceiver, whatever its country of origin,

As with any piece of equipment we found a couple of things we'd like to see Yaesu change; In this case, serious complaints were notably absent. The adjustment for side-tone level can't be reached without popping the top cover off—we'd like to see It located where it can be readjusted easily, perhaps on the back panel, it also would be nice if the 707 included some sort of a speech processor. Yes, I know that they are often misused, but there are times when a processor is useful. These are very minor prob* lems+ and f almost wish I could find more to gripe about, but I can't!

Power Supply

The matching FP-707 12-volt power supply would be a welcome addition to any shack. Regulation is very tight even under full load and the supply runs quite cooL (Except when testing the rig's protection circuits!) There is one feature of this supply that 1 was very pleased to discover. When you spend $150 on a power supply, you want to be able to get a lot of use out of it. Most supplies designed to match a specific rig have a special cable permanently attached and there is no way to use the supply to power any« thing else unless you tear into the case and add your own con nectors. Yaesu has solved this aggravating problem by putting two multi-way connectors on the back of the supply. In addition to the cable that goes to the FT-707. These connectors are in the main output circuit and can provide the full supply current output, which is 20 Amps intermittent, Thanks. Yaesu! The power supply is aiso provided with a front-facing speaker, which performs well for a speaker of its size.

FV-707DM External Vfo

The FV-707 is a truly unique accessory; it changes the whole character of the rig, it resembles a traditional remote vfo in that It allows spliMrequency operation, but there the resemblance ends. Measuring only one inch high, the FV-707 is designed to fit underneath the rig rather than beside it and once installed it seems to become part of the rig itself. The FV-707 can be programmed to store 12 frequencies in its internal memories. Install two AA cells and those frequencies will be held for a year, even when power is turned off! This eliminates the need to buy crystals for often-used frequencies, and it allows an incredible flexibility of operation.

If you area DX hound, you can scan up and down the band, searching for piieups, and program the frequency of a pileup into each memory, to be recalled later at your whim. If nets are more your cup of tea, the FV-707 will help you keep track of those as well. Indeed, the uses for these memories are limited only by your imagination!

The FV-707 also allows you to scan up and down the band electronically. On the front of the unit are three buttons, marked Up, Down, and Fast. The first two are self-explanatory, and the Fast button works in conjunction with the other two. Normal scan rate is one kHz per second; push the Fast button at the same time as the Up or Down button and the rate increases to 10 kHz per second. With the optional YM-35 microphone, frequency scanning can be accomplished in the same manner using switches mounted on top of the microphone.

FC 707 Antenna Tuner

Designed specifically to conv plement the FT-7Q7. the matching antenna tuner Is a compelling little box. Once you have an FT-7Q7 in your possession, the matching tuner is hard to resist. It sports a lighted meter that keeps track of power output with reasonable accuracy, as well as serving as an swr meter, An unusual but extremely handy feature of this tuner is the built-in dummy load1 switch-seiect-able from the front panel.

As far as the actual tuning circuit goes, it is important to realize from the start that this tuner doesn't intend to compete with the larger and much more expensive tuners on the market. Maximum power-handling capability is 150 Watts, and the tuner will only tune coax lines; there is no provision for random-wire tuning.

Still, the tuner performs its in tended job well, which is reducing swr on coax lines. Just for fun, we tried tuning up a 15-meter dipole on 40 and 10 meters, and the FC-707 handled the job easily. Naturally, such a lash-up didn't work very well, but it did show off the tuner s capabilities! This little tuner should serve well in both mobile and home installations.

Conclusions

Either on its own, or with its accessories, the Yaesu FT-707 is a truly competent piece of equipment. If you are a compulsive knob twirfer, you'll find the digital features of the external vfo impossible to resist. If your quest is for solid performance on both SSB and CWt the 707 offers that, too. Its extremely compact dimensions make it an obvious choice for mobile install tions, yet the front-panel layout

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73 Magazine ■ March, 1981 27

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