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Click to enlarge
Picture: JM CHERRY |
Click to enlarge
Picture: JM CHERRY |
Year 1966
- Price: $289.00
SPECIFICATIONS
 | FREQUENCY COVERAGE - 600 - 6.5 MC, 9.5 -
10.0 11.5 MC, - 12.0 MC, 15.0 -
15.5 MC, 17.5 - 18.0 MC, 21.5 - 22.0 MC, and 25.5 - 26.0 MC with
crystals supplied. Three accessory crystal
sockets are provided for coverage of
any three additional 500 KC ranges between 1,5 and 30 MC with the
exception of 5.0 - 6.0 MC. |
| SELECTIVITY - 5 KC at 6 DB down and 16
KC at 60 DB. |
| I.F. FREQUENCIES - First I.F. - 5645 KC
crystal lattice filter, second I.F. -455KC. |
| STABILITY - Less than 100 cycles after
warm-up. Less than 100 cycles for 10% line voltage change . |
| SENSITIVITY - Signal to noise ratio of
10 DB with less than 2 uv input signal modulated 30%. |
| MODE OF OPERATION - AM |
| DIAL CALIBRATION - Main dial (window)
calibrated 0 - .500 MC and .500 to 1.000 MC in 5 KC divisions. Vernier
dial calibrated 0 to 2 5 KC in 1 KC divisions. |
| CALIBRATION ACCURACY - +- 5KC if dial is
set to known frequency within the band. |
| AGC - Amplified delayed. 3 DB change in
AF output with 60 DB change in RF input. |
| AUDIO OUTPUT - 2 watts at 5% H.D., 3
watts maximum. |
| AUDIO OUTPUT IMPEDANCE - 4 ohms |
| ANTENNA INPUT - 52 ohms nominal |
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Tanks to Tom Taylor - N7TM for the following information'
Hybrid
tube/ transistor SWL receiver? Is the hottest thing on the market .
Source : POPULAR ELECTRONICS, August 1966 (
Thanks to Tom Taylor N7TM
)
IF A MAGAZINE could fall in love with a short-wave listening receiver, it would
fall for the Drake SW-4. A renowned manufacturer of quality ham radio gear, the R. L.
Drake CO . (540 Richard St., Miamisburg, Ohio 45342) is making its first venture into the
SWL market. Using requirements specified by Radio New York Worldwide, Drake has
produced the Model SW-4.
Popular Electronics
tested out one of the first
SW-4 receivers and, in a nut-shell, can report after two months of intensive use that the
SW-4 is everything claimed for it. Intended for tuning the principal international
short-wave broad-casting bands, it uses a system of crystal-controlled high-frequency
oscillators, So that each complete rotation of the tuning scale is exactly equal to 500
kHz. The main dial window is calibrated from 0 to 0.500 MHz and 0.500 to 1.000 MHz. The
skirted vernier dial is calibrated from 0 to 25 kHz in 1.0-kHz divisions. Thus, the SWL
can not only read frequency directly from the dial, but can also tune to a specified
frequency . This is the closest thing we’ve seen to automated SWL’ing: The idea
of direct frequency dialing in radio receivers is not new,, but heretofore the SWL has
been left out in the cold. The SWL either had to buy a ham radio receiver with lots of
extras he didn’t need, or reach way down in bis pocket for an all-band receiver
selling at $600-700. The Drake SW-4 represents the first breakthrough in this respect, and
serves as recognition of ,the fact that SWL’s are looking for a receiver of its
capabilities. We used two different antennas with the SW-4, and we certainly recommend
that the SWL really searching for DX make provisions for antenna changeover -it’s
definitely worthwhile. One antenna was the Mosley SWL‘S, the other a long wire
(100’) strung about 35’ in the air. After calibrating the dial with WWV on 10.0
MHz and 16.0 MHz, we never found it necessary to change the hairline settings. Unknown
stations down in. the mud could be tentatively identified from the 1966 WRH station
listing. Programs that we especially wanted to hear were simply dialed and "there
they were" nine times out- of ten that’s pretty good dialing. The
earlier, very scarce SW-4 (1966) is a hybrid with eight tubes plus
semiconductors and has a band and a range switch plus three 500 kHz
auxiliary crystal sockets. |
SHORT SPECS
| Designed for listening in on the international broadcasting bands, the SW-4 tunes in
seven bands: 6.0-6.5 MHz, 9.5-10.0 MHz, 11.5-12.0 MHz, 15.0-15.5 MHz, 17.5-18.0 MHz,
21.5-22.0 MHz, and 25.5-26.0 MHz, plus three "accessory" 0.5-MHz segments
between 1.5 and 30.0 MHz. |
| Sensitivity is better than 2.0 micro Volt for 10 dB AM signal to noise. Selectivity is 16 kHz
wide at 60 dB down, for optimum broadcast reception. |
| Dial calibration when set with WWW is better than plus or minus 2.0 kHz (in test model). |
| Stability from cold start is under 0.1 kHz. |
| The SW-4 has 10 tubes, 3 transistors, plus diodes in special hybrid circuitry. |
| Unit draws 45 watts from 117volt AC line, and measures 5 1/2" high, 10
3/4" wide, and 11 5/8" deep. Speaker is in identically sized cabinet. |
| Price: $289. Speaker, $19.95 extra . |
Source : POPULAR ELECTRONICS - August 1966
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