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# <a name="2m Radio Receiver for the LV2 Re"></a> 2m Radio Receiver for the LV2 Recovery Node

### <a name="Overview:"></a> Overview:

A 2m amateur radio receiver which sends audio (in out case, DTMF tones) to the [[Recovery Node|RecoveryNodeLV2]].

- Good link: [http://www.geocities.com/hagtronics/2\_meter.html](http://www.geocities.com/hagtronics/2_meter.html)
- Ground radio [Yaesu FT-1500m](http://www.yaesu.com/amateur/ft1500m.html). [The Yaesu FT-2800m replaced the FT-1500m](http://www.yaesu.com/indexVS.cfm?cmd=DisplayProducts&ProdCatID=106&encProdID=D8f1dyu1kYo%3D&DivisionID=65&isArchived=0)

### <a name="Work in progress"></a> Work in progress

The board has been fabbed and tested and works great when shielded. See schematic and board attached below.

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Here are the RSSI voltages I measured in the lab on 6-Sep-2004. They are independent of the tuning of the demodulator, and SINAD. These voltages seemed real similar when Keith and I re-tested on 11-Sep-2004 in the desert.

RSSI voltage vs applied 144.0 MHz dead carrier:

    -50 dBm        0.97 volts DC
    -60            0.87
    -70            0.77
    -80            0.64
    -90            0.54
    -100           0.52    (Expected to be MDS)

-- [[GlennLeBrasseur]]

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Attachments:

- [[2m_reciever.pdf]]
- [[LV2-2m-0.0.sch.zip]]
- [[LV2-2m-0.3.zip]]