Re: Alinco DX-70T

Discussion in 'Ham Radio Discussions' started by N8YV, Jan 21, 2002.

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  1. N8YV

    N8YV Ham Member QRZ Page

    The Radio Shack DX-70s are often the low-power 6 meter versions with 100 watts 160-10, and ten watts on six meters.
    You mentioned you took back a "second" DX-70---did this incident occur on both your first and second rigs? If so, it seems highly unlikely that there would be the exact same problem with both, and I would recommend checking your station connections and antenna system.
    Assuming you are using it on a band other than six meters, the trouble may be 1)your antenna SWR (which you did not mention) at the frequency you were operating; or 2) your DC power supply. The rig requires at least 20 continuous amps DC power to operate properly. If you are using less, and/or your antenna SWR is high, the output may be distorting from the final amplifier output getting hot. If the fan switches in, there is an extra "pull" from the DC supply. If your rig's current draw PLUS the fan's current draw together are overloading the DC supply, the voltage will drop significantly and the distortion may be due to lack of sufficient power. If you are using it in a vehicle, make sure you are NOT connected through any of the vehicle's internal wiring such as the radio, cigarette lighter/accessory outlet, etc. These CANNOT deliver enough current to the rig under a full 100-watt PEP load. You need to connect the positive terminal to your vehicle's 12-volt battery through a good, heavy-guage wire, fused within 18 inches of the battery itself to protect the vehicle. You also need to connect the negative lead to vehicle ground, either at the battery or at least on a clean, solid 12-volt negative metal surface. If you are using your rig indoors,
    your DC power supply must provide a minimum of 20 amps CONTINUOUS DC at 13.8 volts, regulated.
    If the supply is not regulated, the voltage will drop significantly and create the same trouble. If your DC supply and antenna SWR are both up to scratch, then I might start suspecting the rig itself.

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    <P ID="edit"><FONT SIZE=-1>Edited by N8YV on Sun Jan 20 18:44:14 2002.</FONT></P>
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