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## <a name="Mocom Radio Information"></a> Mocom Radio Information

### <a name="About the Mocoms"></a> About the Mocoms

<center>[[mocom_picture.jpg]]</center>

Our 2m (146.43MHz) emergency uplink system needed a powerful radio to make sure we could send emergency commands to the rocket. We had some surplus Mocom radios - old VHF radios from the early 1970's - which can put out about 50W max.

We've used the Mocoms for LV1/1b and are continuing to use them for LV2.

and attach it directly to a device which generates DTMF signals.

- [[Information on LV1/1b's 8051-based DTMF generator box|LvOneUplinkDtmfBox]].
- For LV2, we've moved to a PC running a small java app (along with DTMF dial) and a [[small adapter box to hook the PC to the Mocom|LvTwoPcMocomAdapter]].

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### <a name="Mocom Information"></a> Mocom Information

Uses crystals to get RX/TX = 146.43MHz

The radio's connector (what we call the "head"):

<center>[[mocom_head.jpg]]</center>

Wiring schematic:

<center>[[mocom_wiring_scematic.jpg]]</center>

Shot of the inside of the Mocom radio: note the added diode and the power out adjustment potentiometer.

<center>[[mocom_innards.jpg]]</center>

Closeup on the added diode since we'll surely have to do it again: It's a 1N4001 diode which should kill the back-EMF of the relay coil so that we don't blow the mocom driving circuit.

<center>[[mocom_diode.jpg]]</center>