DRAKE SW 1 Instruction Manual download pdf (Page 9)

October 1997 79

Table 3

Radio Shack DX-394, serial number, C004541

Manufacturer’s Specifications Measured in ARRL Lab

Frequency coverage: 0.15-30 MHz. As specified.

Modes of operation: LSB, USB, AM, CW. As specified.

Power requirements: 120 V ac, 13 W; 13.8 V dc, 300 mA.

Size (height, width, depth): 3.8×9.2×9 inches; weight, 4.6 lb.

SSB sensitivity, bandwidth not specified, As specified.

10 dB (S+N)/N, 1.7-30 MHz, 0.3 µV.

CW sensitivity, bandwidth not specified, As specified.

10 dB (S+N)/N, 1.7-30 MHz, 0.1 µV.

AM sensitivity, bandwidth not specified, 10 dB (S+N)/N, signal 30% modulated

10 dB (S+N)/N: 150-510 kHz, 10 µV; with a 1-kHz tone: As specified.

510-1730 kHz, 7 µV; 1.7-30 MHz, 1 µV.

Blocking dynamic range: Not specified. 14 MHz, CW1 position, 104 dB at

100-kHz spacing.

Two-tone, third-order IMD dynamic range: 14 MHz, CW1 position, 84 dB at 100-kHz

Not specified. spacing.

First IF rejection: 80 dB (50-Ω antenna). 67 dB.

First IF image rejection: 80 dB (50-Ω antenna). 70 dB.

IF/audio response: Not specified. Bandwidth at –6 dB points: CW1, 333 Hz;

CW2, 328 Hz; USB, 2059 Hz;

LSB, 2111 Hz; AM, 9520 Hz.

Audio output: 0.8 W at 10% THD into 8 Ω. 1.1 W at 10% THD into 8 Ω.

NOTE: All dynamic range measurements were taken at 100 kHz, instead of at the ARRL Lab

standard of 20 kHz.

like 49 or 31 meters—160 memories in all. Of

course, this can make for a little confusion

when you’re trying to recall which set of 10

memories you’re operating with at any given

moment. A separate

MON

button lets you store

and recall a frequency in a “scratchpad”

memory. An internal, rechargeable cell backs

up memories a month or more, when power is

removed from the receiver.

On any given evening—especially here

in the Northeast—the 40-meter amateur

phone band (41-meter SW BC band) can be

a radio listener’s nightmare, particularly for

a receiver lacking in dynamic range. Of

course, we put the DX-394 to that test. While

the needle-pinning AM broadcast stations

dominated the band (and the DX-394’s front

end and/or AGC), we still were able to locate

and copy some of the amateur SSB stations

that had shoehorned their way among the BC

behemoths. We pulled out several stations in

a crowded 75-meter band as well. CW and

SSB share the same IF filter, but additional

audio filtering is switched in when you move

to the CW position. In actual use, we even

were able to hear weaker CW signals, but

also lots of other stations at the same time—

and some of them overloaded the front end,

reducing sensitivity. Backing off on the

GAIN

control was a big help. The rear-panel

ATT switch was a necessity. ARRL Lab test-

ing also determined that the radio’s noise

floor varies considerably with frequency.

The DX-394 did a decent job of receiv-

ing AM signals, and we were able to copy

many international broadcasters with no

problem, even using the built-in whip an-

tenna. AM stations on the DX-394 had a

comfortable sound—especially on the stan-

dard AM broadcast band. We also were able

to monitor some AM activity on the amateur

bands, and, of course, we eavesdropped on

some local 11-meter CB chatter. For those

demanding narrower, more consistent filter-

ing, a 6.5-kHz AM filter, model LFH-4S, is

available for $15, shipping included, from

Kiwa Electronics, 612 South 14th Ave,

Yakima, WA 98902; tel 509-453-5492 or

(orders only) 800-398-1146; e-mail kiwa@

wolfe.net; http://www.wolfe.net/~kiwa/

index.html.

The 31-page DX-394 Owner’s Manual

included nice tables of the international

broadcasting bands and even pointed out

that both 3900-4000 and 7100-7300 kHz

are shared between hams and international

broadcasters and “interference is heavy in

this range.” It has a useful troubleshooting

table, too.

Manufacturer: Tandy Corp, 1900 One

Tandy Center, Ft Worth, TX 76102; tel 817-

390-3700. The DX-394 is available from

Radio Shack retail outlets. Manufacturer’s

suggested retail price, $249.99; optional DC

adapter model 270-1533, $4.49.

SOLICITATION FOR PRODUCT

REVIEW EQUIPMENT BIDS

[In order to present the most objective re-

views, ARRL purchases equipment off the

shelf from dealers. ARRL receives no remu-

neration from anyone involved with the sale or

manufacture of items presented in the Prod-

uct Review or New Products columns.—

Ed.

]

The ARRL-purchased Product Review

equipment listed below is for sale to the high-

est bidder. Prices quoted are minimum accept-

able bids, and are discounted from the purchase

prices. All equipment is sold without warranty.

Alinco DJ-G5TH dual-band hand-held

VHF/UHF transceiver (see “Product Re-

view,” Jul 1997 QST). Minimum bid: $244.

AOR AR7030 communications receiver,

(see “Product Review,” Jun 1997 QST).

Minimum bid: $758.

Grundig Yacht Boy 400 BC/SW/FM por-

table receiver, (see “Product Review,” Jul

1997 QST). Minimum bid: $112.

ICOM IC-T7A dual-band hand-held VHF/

UHF transceiver (see “Product Review,”

Jul 1997 QST). Minimum bid: $198.

ICOM IC-W32A dual-band hand-held

VHF/UHF transceiver (see “Product Re-

view,” Jul 1997 QST). Minimum bid: $251.

Japan Radio Corp NRD-535 HF receiver

(see “Product Review,” May 1997 QST).

Minimum bid: $1122.

Panasonic RF-B45 BC/SW/FM portable

receiver, (see “Product Review,” Jul 1997

QST). Minimum bid: $112.

Radio Shack Model 21-527 digital SWR/

power meter, (see “Product Review,” Jun

1997 QST). Minimum bid: $40.

Radio Shack Probe-Style Oscilloscope

(see “Product Review,” Aug 1997 QST).

Minimum bid: $66.

Sangean ATS-909 BC/SW/FM portable

receiver, (see “Product Review,” Jul 1997

QST). Minimum bid: $178.

Sony ICF-2010 BC/SW/FM portable re-

ceiver, (see “Product Review,” Jul 1997

QST). Minimum bid: $238.

Standard C508A dual-band hand-held

VHF/UHF transceiver (see “Product Re-

view,” Jul 1997 QST). Minimum bid: $188.

Ten-Tec Centaur Model 411 HF linear

amplifier, (see “Product Review,” Jun

1997 QST). Minimum bid: $495.

Yaesu FT-50R dual-band hand-held VHF/

UHF transceiver (see “Product Review,”

Jul 1997 QST). Minimum bid: $218.

Sealed bids must be submitted by mail and

must be postmarked on or before November 1,

1997. Bids postmarked after the closing date

will not be considered. Bids will be opened

seven days after the closing postmark date. In

the case of equal high bids, the high bid bearing

the earliest postmark will be declared the suc-

cessful bidder.

In your bid, clearly identify the item you

are bidding on, using the manufacturer’s name

and model number, or other identification num-

ber, if specified. Each item requires a separate

bid and envelope. Shipping charges will be paid

by ARRL. Please include a daytime telephone

number. The successful bidder will be advised

by telephone with a confirmation by mail. No

other notifications will be made, and no infor-

mation will be given to anyone other than suc-

cessful bidders regarding final price or identity

of the successful bidder. If you include a self-

addressed, stamped postcard with your bid and

you are not the high bidder on that item, we will

return the postcard to you when the unit has

been shipped to the successful bidder.

Please send bids to Bob Boucher, Product

Review Bids, ARRL, 225 Main St, Newington,

CT 06111-1494.

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