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| Cheap CB Comparo: Thoughts? http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=45&t=55050 |
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| Author: | InCommando [ Fri Aug 20, 2010 10:10 am ] |
| Post subject: | Cheap CB Comparo: Thoughts? |
I have two el cheapo CB's: A Cobra 19 ultra III and a Radio Shack TRC 502. Which to use? TRC 502 RECEIVER Frequency Coverage .................... All 40 Channels (Class D) 26.965 to 27.405 MHz Sensitivity .................................................................... 0.5 uV or Better for 10 dB S/N Squelch Sensitivity .................................. From 0.5 uV to 1 mV Adjustable (Nominal) Frequency Response .......................................................... – 6 dB 450 Hz to 2.5 kHz Adjacent Channel Selectivity .................................................... 45 dB at 10 kHz Away Audio Output Power .......................................................................................... 1 Watt Cross Modulation .............................................................................................. 50 dB TRANSMITTER Frequency Coverage .................... All 40 Channels (Class D) 26.965 to 27.405 MHz Frequency Tolerance ................................................................ +/– 100 Hz (Nominal) Output Power .............................................................................. 3.7 Watts (Nominal) Modulation Type ..................................................................................................... A3 Antenna Impedance ....................................................................................... 50 Ohm Spurious Emission ........................................................................... – 67 dB or Better Modulation Capability ........................................................................................... 90% Current Drain ............ 1.1 Amps with no modulation; 1.5 Amps with 80% modulation Power Requirements .................................................... 13.8 V DC, Negative Ground Cobra Channels CB – 40 CH Frequency Range CB – 26.965 to 27.405 MHZ Frequency Tolerance 0.005 % Frequency Control PLL (Phase Lock Loop) Synthesizer Operating Temperature Range -30° C TO + 65° C Microphone Plug-in Electret Input Voltage 13.8VDC nom. (negative ground) Current Drain Transmit: AM full mod., 1.4A (maximum) Receive: Squelched, 0.9 A; full audio output, 1.2A (nominal) Size 67⁄8" D x 63⁄4" W x 17⁄8" H Weight 3.25 lbs. Antenna Connector UHF; SO-239 Meter LCD’s; indicates relative power output and received signal strength Transmitter Power Output 4 watts Modulation AM (Amplitude Modulation) Frequency Response 300 to 3000 Hz Output Impedance 50 ohms, unbalanced Receiver Sensitivity Less than 1 μV for 10dB (S+N) Selectivity 6 dB @ 7 KHz, 60 dB @ 10KHz Image Rejection 60 dB, typical Adjacent-Channel Rejection 50 dB, typical Automatic Noise Limiter Built-in On power output lone, it looks like the Cobra gets the win? |
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