IT~PRC-247A

Overview

The PRC-247A is the major component of the radiostation GRC-247A and VRC-247A.
They are intended for vehicular or ground installation, with the addition of an external power amplifier the output power is 100W instead of the normal 20W pep.
These sets were built by the italian firm IRET (Industria Radio Eelettrica Telecomunicazioni) and used by the spanish army.

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  The PRC-247

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  inside view af the PRC-247A, the antenna tuner

Specifications

Frequency range

2.000 to 29.999 mc in 0.1 kc steps.

Frequency standard stability

1.0 parts/million.

Intermediate frequency

65 Mhz Ist IF, 5Mhz 2nd IF.

Operating temperature range

-25°C to +55°C

Operating mode

A3J (LSB-USB)

A3H (LSB)USB) AM compatibility

A1 (LSB-USB) CW 1000Hz shifted

Transmitter performance:

High power output

A3J A1 20W pep A3H, 5W carrier.

Low power output

1/10 of high power

Monitor sidetone

Voice or tone as determined by modulation mode.

Tuning indicator

Meter.

Receiver performance:

Sensitivity

A3J A1 1 microvolt for 10 db, signal plus noise to noise

A3H 2.5 microvolt for 10db S+N/N

Selectivity

A3J A1 -6 db 3000Hz, -60 db 5,500 Hz.

A3H -6 db 6000 -60 db 15000Hz

Audio output

2 mw minimum into a 300-ohm headset

1W into 50 Ohm loudspeaker

Input power

6W average @28Vdc

Reference Files

PRC-247A

TM200-GRC-VRC-B

INSTRUCTIONS MANUAL

HF-SSB TRANSCEIVER

GRC-247/ VRC-247/A

NOVEMBER 1973