From October 2001 QST © ARRL
Table 2
Ranger Communications RCI-2970DX, serial number T1M00426
Manufacturer’s Claimed Specifications Measured in the ARRL Lab
Frequency coverage: receive and transmit, 24.89-24.99, 28-29.7 MHz. Receive and transmit, as specified.
Modes of operation: CW, USB, LSB, FM, AM. As specified.
Power requirements: 13.8 V dc; current consumption not specified. Receive, 0.35 A; transmit, 18 A, tested at 13.8 V.
Size (HWD): 3.9×7.8×9.3 inches; weight, 7.4 lb.
Receiver Receiver Dynamic Testing
SSB/CW/AM Sensitivity, 10 dB (S+N)/N: 0.5 µV. Noise floor (MDS)
1
:
24.9 MHz –136 dBm
28 MHz –132 dBm
AM, 10 dB (S+N)/N, 1-kHz tone, 30% modulation:
29 MHz 0.42 µV
FM sensitivity, 12 dB (S+N)/N: 0.25 µV. For 12-dB SINAD:
29 MHz 0.31 µV
Blocking dynamic range: Not specified. Blocking dynamic range, 20-kHz spacing:
1
24.9 MHz 81 dB
28 MHz 75 dB
Two-tone, third-order IMD dynamic range: Not specified. Two-tone, third-order IMD dynamic range:
1
24.9 MHz 66 dB
28 MHz 61 dB
Third-order intercept: Not specified. Intercept: 24.9 MHz, –37 dBm; 28 MHz, –41 dBm.
2
FM adjacent channel rejection: Not specified. 20-kHz offset from 29 MHz, 77 dB.
FM two-tone, third-order IMD dynamic range: Not specified. 20-kHz channel spacing, 29 MHz, 53 dB.
Spurious response: IF rejection, 65 dB, image IF rejection: 105 dB; image rejection, 72 dB.
rejection: Not specified.
Squelch sensitivity: Not specified. 0.12 µV at threshold.
Audio power output: 2.5 W, THD and load unspecified. 3.0 W at 10% THD into 8 Ω.
Transmitter Transmitter Dynamic Testing
Power output: CW, FM, AM, 50 W; SSB, 150 W. AM, CW, typically 51 W; FM, typically 60 W; SSB,
typically 115 W.
3
Spurious signal and harmonic suppression: 50 dB. 53 dB. Meets FCC requirements for spectral purity.
SSB carrier suppression: 50 dB. 46 dB.
Undesired sideband suppression: Not specified. 39 dB.
Third-order intermodulation distortion (IMD) products: See Figures 6 and 7.
CW keying characteristics: Not specified. See Figure 8.
Transmit-receive turn-around time (PTT Squelch on, S9 signal, 200 ms.
release to 50% of full audio output): Not specified. Unit is not suitable for use on AMTOR.
Receive-transmit turn-around time (“tx delay”): Not specified. SSB, <1 ms; FM, <1 ms.
Composite transmitted noise: Not specified. See Figures 9 and 10.
All dynamic range measurements are taken at the ARRL Lab standard spacing of 20 kHz.
1
500-Hz bandwidth filter not available. Bandwidth on CW is approximately 1900 Hz. See text.
2
Intercept points calculated using noise floor method.
3
See text.
and public address speaker—a chassis
mounted SO-239 antenna jack and a
six-pin rectangular dc power jack. A
headphone jack is not provided. The dc
power connector is physically the same
as the one found on the vast majority of
modern HF transceivers, but beware: the
wiring configuration is different. The in-
cluded dc power cable is about 10 feet
long and is fused in both leads.
A massive heat sink is fastened to the
underside of the enclosure. The radio
does not employ a cooling fan. My oper-
ating experiences indicate that the cool-
ing system is sufficient; I didn’t encoun-
ter any instances where the heat sink
became particularly hot.
The
U-shaped mobile mounting
bracket that’s packed with the rig can only
be attached toward the upper side of the
enclosure. This allows you to mount the
radio under a dashboard or shelf—not
above. An extended bracket that fits be-
low the radio is available as an optional
accessory. Four thumbscrews are pro-
vided for securing the mobile mounting
bracket to the chassis. Some additional
mounting hardware and a microphone
hanger are also included.
Documentation
The small 18-page Owner’s Manual is
adequate, though not overflowing with
(11 paginas)
Manymanuals.com
Manymanuals.de
Manymanuals.fr
Manymanuals.it
Manymanuals.pl
Manymanuals.cz
Manymanuals.es
Manymanuals-pt.com
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