Cobra 148 GTL

Optional Accessories

Tune-up. (perform a tune-up to radio to increase power, audio and performance) AM carrier 5 watts and 18-20 watts peak power.

$29

RFX-150 Final. (perform a tune-up to the radio. Increase power, audio and performance and a completely new final section consisting of even higher power MOSFETs) AM carrier 35 watts and 120+ watts peak power.

$185

Perform Receiver improvement mods.
(These mods replace key RX parts for better sensitivity and selectivity)

$26

Tune-up and frequency conversion.
(Modified for expanded frequency coverage / more channels) using TONE and PA switch.

$75

Add a "Power" control or Watt knob
(Modified to have variable AM power with a control placed in the rear)

$25

Turner RK-56 Noise Canceling microphone.
(wired for this radio with a 4 pin plug)

$46

Astatic 636L Noise Canceling microphone.
(wired for this radio with a 4 pin plug)

$29

Astatic D104-M6b Amplified microphone.
(wired for this radio with a four pin plug and a battery installed)

$41

Install an Echo board.
(wired internal to the radio with dual controls for speed and echo effects TRB-X2/X3 Echo board)

$65

Install a Noise toy
(wired inside the radio with a switch or pushbutton to trigger any 30 second sound byte you want)

$65

Install a Noise toy as a background theme music
(wired inside the radio with a switch to play any background music at very low volume so you can talk over it.)

$65

Install a Record /Playback Module
Wired inside the radio with two pushbuttons on the side to record 120 seconds and to play it back.

$77

Install Talkback
(wired inside the radio so that when you talk you can hear yourself. If you chose an Echo or a Recorder mod, I highly suggest this as well)

$10

Add a Small External Speaker
(plugs into back of the radio for improved sound)

$12

Add a Large External Speaker
(plugs into back of the radio for improved sound)

$25

Exchange the top and bottom covers to Chrome Covers.

$32

Exchange the top and bottom covers to Diamond Plate Covers.

$22

GENERAL
Channels	40 AM, 40 LSB, 40 USB.
Frequency Range	26.965 to 27.405 MHz.
Frequency Control	Phase Lock Loop (PLL) synthesizer.
Frequency Tolerance	0.005%.
Frequency Stability	0.001%.
Operating Temperature Range	-22° F to +122° F (-30° C to +50° C).
Microphone	Plug-in dynamic; with push-to-talk switch and coiled cord.
Input Voltage	13.8V DC nominal, 15.9V max., 11.7V min. (positive or negative ground).
Current Drain Transmit:	AM full mod., 2.2A. SSB 12 watts PEP output, 2A.
Current Drain Receive:	Squelched, 0.25A Maximum audio output, 0.6A.
Size	2 3/8”(H) x 7 7/8”(W) x 9 1/4”(D).
	(6 cm (H) x 20 cm (W) x 23.5 cm (D)).
Weight	5 lbs. (2.27 kg).
Antenna Conductor	UHF, S0239 www.bellscb.com
Semiconductors	3 field effect transistors, 45 transistors, 63 diodes, 6 integrated circuits, 1 two color light emitting diode.
Meter	(3-in-1) Illuminated; indicates relative output power, received signal strength, and SWR.
TRANSMITTER
Power Output	AM, 4 watts. SSB, 12 watts, PEP.
Modulation	High-and low-level Class B, Amplitude Modulation.
Intermodulation Distortion	SSB: 3rd order, more than -25 dB. 5th order, more than -35 dB.
SSB Carrier Suppression	55 dB.
Unwanted Sideband	50 dB.
Frequency Response	AM and SSB; 300 to 2500 Hz.
Output Impedance	50 ohms, unbalanced.
Output Indicators	Meter shows relative RF output power and SWR. Transmit LED glows red when transmitter is in operation.
RECEIVER
Sensitivity	SSB: 0.25 µV for 10dB (S+N)/N at greater than 1/2-watt of audio output. AM: 0.5 µV for 10 dB (S+N)/ at greater than 1/2- watt of audio output.
Selectivity	AM: 6dB @ 3 KHz, 50 dB @ 9 KHz. SSB: 6 dB @ 1.1 KHz, 60 dB @ 2.3 KHz.
Image Rejection	More than 65 dB.
IF Frequency	AM: 7.8 MHz 1st IF, 455 KHz 2nd IF. SSB: 7.8 MHz.
Adjacent-Channel Rejection	60 dB AM & 70 dB SSB.
AM and SSB RF Gain Control	40 dB adjustable for optimum signal reception.
Automatic Gain Control (AGC)	Less than 10 dB change in audio output for inputs from 10 to 100,000 microvolts.
Squelch	Adjustable; threshold less than 0.25 µV.
ANL	Switchable.
Noise Blanker	RF type, effective on AM and SSB.
Voice Lock Range	±2.5 KHz.
Audio Output Power	4 watts into 8 ohms.
Frequency Response	300 to 2500 Hz.
Built-in Speaker	4 ohms, round.
External Speaker (Not Supplied)	8 ohms; disables internal speaker when connected.
PA Power Output	4 watts into external speaker. External Speaker for PA 8 ohms.