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 | When you buy one ,
ALWAYS ASK:
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GENERAL
| Linear permeability tuned VF0 with 1 kc
dial divisions. |
| VF0 and crystal frequencies pre-mixed
for all-band stability |
| Covers ham bands 80, 40, 20, 15 meters
completely and 28.5 to 29.0 Mc of 10 meters with crystals furnished |
| Any fifteen 500 KHz ranges between 1.5
and 30 Mc can be covered with accessory crystals for 180 meters, MARS,
etc.(5.0-6.0 Mc not recommended) |
| Electronic passband tuning gives
sideband without retuning |
| Accessory Noise blanker
operates on CW, SSB, and AM |
| Notch filter
and 25 Kc crystal calibrator are built-in |
| Product detector
for SSB/CW, diode detector for AM |
| a Crystal Lattice Filter gives superior
shape factor and ultimate selectivity for better adjacent channel
rejection |
| Solid State Permeability Tuned VFO |
| Three AGC release times, two for SSB and
AM plus fast break-in CW. Also AGC off. |
| 10 tubes,
10 transistors, 17 diodes and 2 integrated circuits |
| Excellent Overload and
Cross Modulation characteristic |
SPECIFICATIONS
| Frequency
Coverage : Covers 3.5 to 4.0 MHz, 7.0 to 7.5 MHz, 14.0 to 14.5
MHz, 21.0 to 21.5 MHz, and 28.5 to 29.0 MHz. |
| Accessory Coverage: 15 accessory
crystal sockets are provided. Coverage of any additional 500 kHz
ranges between 1.5 and 30 MHz (except between 5.0 and 6.0 MHz) can be
added by installing accessory crystals. |
| Modes of Operation: SSB, CW, AM,
RTTY. |
| Sensitivity: SSB Mode: 10 dB
signal-plus-noise to noise ratio obtained on 80 M-10 M amateur bands
with less than a 0.25 microvolt signal on the antenna terminal, on
other frequencies less than 0.5 microvolt signal. |
| Selectivity:
 | As supplied:
 | SSB Mode: 2.4 kHz at 6 dB, 4.2
kHz at 60 dB. |
| AM Mode: 8.0 kHz at 6 dB, 28 kHz
at 60 dB. |
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| With accessory crystal filters:
| AM Mode, 2 filters available:
| 6.0 kHz at 6 dB, 10 kHz at
60 dB. |
| 4.0 kHz at 6 dB, 7.5 kHz at
60 dB. |
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| CW 1.5, CW .5, CW .25 5 Modes, 3
filters available:
| 1.5 kHz at 6 dB, 3.0 kHz at
60 dB. |
| 500 Hz at 6 dB, 1000 Hz at
60 dB. |
| 250 Hz at 6 dB, 600 Hz at 60
dB. |
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| Stability : After warm up,
frequency will not drift more than +- 100 Hz, including voltage
variation of +- 10%. |
| Calibration: Better than +- 1 kHz
when calibrated at nearest 100 kHz calibration point. |
| Spurious Responses: Internal
spurious response less than the equivalent of a 1 microvolt antenna
signal on all amateur bands. |
| Image Rejection: (11.29 MHz above
desired): Over 70 dB below 23 MHz, 60 dB above 23 MHz. |
| Input Impedance: 52 Ohms nominal. |
| Audio Output Impedance: 3.2 Ohms
to speaker, or headphones, 3000 Ohms anti VOX. |
| Audio Output: 0.7 Watt at AVC
threshold, 2 Watts maximum at less than 5% T.H.D. |
| AGC: Audio Output increases 3 dB
maximum for a RF input increase of 100 dB above AGC threshold. AGC
threshold typically 1 microvolt.
| Attack time: 1 millisecond |
| Release times:
| Slow: 1 second |
| Medium: 350 mSec |
| Fast: 50 mSec |
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| Power Consumption: 60 Watts,
120/240 Volts AC, 50/60 Hz. |
| Size: 5.5 inches high, 10.75
inches wide, 12.25 inches deep overall. |
| Weight: 17 pounds. |
Crystal filters accessories
 March
01/2002 - Drake
R-4C Communications Receiver (Recent Equipment)
(c) QST 01/1974 - page 48 - 2.25 Mb file - Adobe
pdf version
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