recapen(at)earthlink.net
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 Posted: Mon Nov 12, 2007 10:03 am Post subject: Transponder issues (antenna based?) |
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Here's what I've done/found:
Upon start-up the SL-70 says TEST and FAIL in the two display windows.
If I turn the little knob on the right - it goes to the specific tests individually -all PASS except for SYN, RECV, and TRAN
Took antenna direct to the back of the unit (down to the first piece of coax) with a 5.5" aluminum disk as a ground plane.
No change
Measured continuity of the first piece of coax
Open from center to shield
Initial resistance of center conductor goes to zero shortly
Initial resistance of shield does not go to zero but remains very low
The Transponder did not come alive - although it still continues to pass encoder info to the GPS
Here's what I think:
The radio portion of the unit is hosed and the box needs to go in for repair - off
to call GarminAT repair.
The first antenna coupling (in the back of the unit's tray) and the first chunk of cable attached thereto is where I'll start troubleshooting the resistance problem.
Here's where I need comments:
RG400 shield resistance - I think it should go to zero just like the center conductor.
The first pair of connectors appear to be silver plated - and the plating appears to be oxidized - I would think that inserting and reseating the connector should (but shouldn't need to) renew the connection.
Thanks in advance,
Ralph Capen
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