21-1620.fm Page 24

Thursday, August 5, 1999 11:16 AM

ADDING CRYSTALS

Your TRC-235 includes two crystals (transmit and receive) installed in channel position A. The crystals let you use the CB on channel 14. You can add two more crystals in channel positions B and C so you can use any two other channels of the 40 allotted to CBs. However, you must use only crystals specifically designed for the TRC-235, available from your local RadioShack store. Be sure to specify the channel you want and the TRC-235’s cat- alog number (Cat. No. 21-1620).

Note: Channel A crystals are soldered in, and can be replaced only by a qualified technician.

The following chart shows the frequency pairs (in MHz) for receiving and transmit- ting on each CB channel.

Note: Receive crystals use a frequency 455 kHz lower than transmit crystals.

Channel

Transmit

Receive

 

 

 

 

 

 

1

26.965

26.510

 

 

 

2

26.975

26.520

 

 

 

3

26.985

26.530

 

 

 

4

27.005

26.550

 

 

 

5

27.015

26.560

 

 

 

6

27.025

26.570

 

 

 

7

27.035

26.580

 

 

 

8

27.055

26.600

 

 

 

9

27.065

26.610

 

 

 

10

27.075

26.620

 

 

 

11

27.085

26.630

 

 

 

12

27.105

26.650

 

 

 

13

27.115

26.660

 

 

 

14

27.125

26.670

 

 

 

15

27.135

26.680

 

 

 

24

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Radio Shack 21-1620, TRC-235 owner manual Adding Crystals, Channel Transmit Receive

TRC-235, 21-1620 specifications

The Radio Shack 21-1620, commonly referred to as the TRC-235, is a notable entry in the world of CB radios. Designed to cater to both novice and experienced users, this particular model embodies a blend of functionality, reliability, and user-friendly features.

One of the standout characteristics of the TRC-235 is its compact and portable design, making it an ideal choice for both mobile and stationary applications. The unit is compact enough to fit into tight spaces while still offering a robust set of features that enhance communication capabilities. With a durable construction, it is designed to withstand the rigors of transportation, whether in a vehicle or on a work site.

In terms of performance, the TRC-235 operates on the standard 40 CB channels, providing users with ample options for communication. This capability is essential for those who require clear and constant communication, especially in areas where other forms of communication may fail. Additionally, the radio features an adjustable RF gain control, which allows users to filter out unwanted noise and focus on the transmission quality. This adjustment enables clearer conversations, which is crucial in high-traffic areas.

The Radio Shack 21-1620 also comes equipped with several essential features designed to enhance usability. A built-in built-in speaker ensures clear audio output, while the external mic jack allows for the attachment of an external microphone, improving sound clarity further. The unit’s easy-to-read LED display displays channel and frequency information, helping users navigate through channels effortlessly.

Furthermore, the TRC-235 integrates advanced technology, such as automatic noise limiter circuitry, which significantly reduces background noise for clearer communication. The radio also supports a range of modulation types, including AM, which is standard in CB radios.

For those who appreciate versatility, the TRC-235 allows for seamless integration with other communication equipment, such as antennas and amplifiers, enhancing its performance and range.

In summary, the Radio Shack 21-1620 TRC-235 is a well-rounded CB radio that balances user-friendly features, durable construction, and advanced communication technology. It remains a reliable choice for those seeking effective communication solutions in various environments. Whether for recreational use or professional applications, the TRC-235 stands out as a trusted companion in the CB radio spectrum.