Micro Computer Concepts

Repeater made from GE Mastr Exec II.

Micro Computer Concepts has manufactured and marketed repeater controllers for over 12 years. Now it is integrating its controllers with one of the best receiver/transmitters to form a ready to plug in repeater on your frequency, tuned and guaranteed. We want to make the repeater installation simple for the repeater owner; a plug and play system. You will need to add duplexer, antenna and 13.8 VDC power supply.


The receiver/transmitter unit is a GE Master Executive II mobile converted for repeater use. The GE Master Exec II receiver employs a five cavity helical input filter to insure out of band rejection. It was developed to work in the harshest RF environments. Unlike other repeaters which have transmitter noise only 60 dB down, the Master Exec II's transmitter is one of the quietest and cleanest with noise over 85 dB down allowing the use of less expensive duplexers (4 cavities instead of the usual 6). It was engineered to be a high performance receiver/transmitter unit for use in locations with other nearby transmitters.

The repeater can be ordered with a variety of Micro Computer Concepts controllers from the very basic of key transmitter on receiver input, to controllers with autopatch, reverse patch, voice, remote base interface and more. The repeater can also be ordered for use with other controllers. A DB15S connector is provided and includes the signals necessary for use with an external controller.

A special panel has been added with volume and squelch controls, speaker jack, LED indicators for power, push-to-talk, carrier-operated squelch and CTCSS detect, accessory DB15 connector and power connections.

To provide clean natural sounding audio a custom audio board is installed which de-emphasises the audio at the EIA spec of rolling off at 6 db per octive and a high pass filter for removing incoming CTCSS (PL tone).

The GE Master Exec II repeaters sold by MCC are a derated in power to

6 meter... 60 Watt

using 110 watt radio.

VHF (2 meters)...30 watt output using 40 watt radio.

UHF repeater... 30 watt output using 40 watt radio.

At times we have higher power VHF & UHF repeaters with avialability.

VHF 60 W....$499.95

using 110 W radio

UHF 50 W...$499.95

using 75 W radio

Receiver Specifications

Sensitivity: 0.35 microvolts for 12 dB sinad
Selectivity: front end +/- 1 MHz, IF 12 kHz
Audio level and impedance: 8 Ohm speaker & 600 Ohm 1 V P-
Inter modulation: -80 dB
Squelch sensitivity: 0.2 microvolt open

Transmitter Specifications

Output power: 6 meters: 60 watts
2 meters: 30 watts
70 centimeters: 30 watts

Spurious & harmonic emission: -85 dBc minimum
Emission type: 16F3
Duty Cycle: continuous at rated output power
Maximum deviation: +/- 5 kHz (factory set)

General Specifications

Frequency stability: +/- 5 PPM at -5 to +55C (+23 to +131F)
Size: 13.5"w x 4.1"h x 12/1"d (low power) 16"d (high power)
Power requirements: 13.8 VDC @ 8 Amp.
Panel: Squelch & Volume, indicators for power, COS, tone & PTT, speaker out, receiver and transmitter antennas, phone line (with autopatch option, DB15S accessory connector & 4 ft red/black #10 guage power cable.

Repeater Manuals 

The repeaters are supplied with a partial GE Mastr Exec II manual with tuning procedures, pictorials and schematics.  The manual is meant to aid in maintaining the repeater. 

PRICES

6 meter repeater 60 watt $399.95
2 meter repeater 30 watt $399.95
UHF repeater 30 watt $399.95

Prices do not include a controller or CTCSS tone board.

At times we have receiver pre-amps for the above repeaters.  If we can supply they can be added.

Pre-amp......$40

MCC offers controllers and if ordered with repeater the control can be installed inside the repeater and all audio is adjusted.
The repeater can also be ordered for an external control where the repeater inputs & outputs are brought out to the DB-15S connector on the front panel.

If CTCSS tone is needed MCC will install TS-64DS dip switch tone set encoder/decoder.
TS-64DS.....$69.95

Due the repeaters being crystal controlled if an order is canceled a $50 charge will be made to cover the crystals.
For COD orders a $50 deposite is required prior to the start of a repeater build.

The repeaters we build are mostly custom to the customers specifications (controller, tone, frequency, etc)  An order can be canceled, but if crystals are ordered $50 is charged.  If a late cancellation a build charge, usually less than $50, must also be charged.  We try to work with our customers to give a fair deal only charging for actual charges. 

MCC Controllers available for install in Exec II repeater

OR

we can build for external controller.

Sorry, but we do not work with other manufactures controllers. 

The repeater is supplied with top and bottom covers, but shown here with the covers removed.

Repeater bottom view.

One of our controller, RC-1000V, is mounted to the rear and to the front is the repeater audio/squelch control board.

Repeater custom front panel with volume and squelch controls, SO-239 Transmitter antenna connector, phono speaker connector DB15 accessory connector and LEDs.

The DB15 either brings out the repeater I/O (tx/rx audio, etc) for an extrenal control or various accessories of one of our controls mounted inside.

Repeater from top.

The exciter is to the left, receiver with 5 cavity helical front end and PA to the rear.

In the middle front is our custom audio board which employs a CTCSS receiver filter and de-emphasis network for smoothing the receiver audio to the internal or external controller.

Repeater receiver with 5 cavity helical front end.

 Rear of PA heat sink.

Transmitter exciter with custom audio board.

See "Order Information" for placing a repeater order.