Have you checked the toroid? It's been a few years since I had one, but
IIRC the toroid is always in the circuit on the 989C. If not, how about
the output selector switch? I've purchased more than one tuner/antenna
switch etc that had missing solder joints, or bridged connections from
too much solder.
73
Roger (K8RI)
On 1/1/2015 3:09 PM, Tom Osborne wrote:
Hi
I picked up an MFJ-989C tuner that has a problem (don't want to hear
about 'mitey fine junk).
The problem is that the SWR goes down and then slowly creeps back up.
I got a new roller inductor and installed it and the SWR still doesn't
stay low, even at low power.
I took the roller inductor out and put in a switch/coil combo to
eliminate the coil problem. SWR still climbs up.
Bypassed the SWR circuitry and ran the input from the antenna directly
to the capacitor. Still won't stay low.
I thought it might be the SWR circuitry but I put another tuner in
front of this one and when I tune the SWR down with the other tuner,
it stays down, so don't think it should be the SWR circuit.
This really has me puzzled. Can't see anything left to check. Any
ideas? Thanks and 73
Tom W7WHY
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73
Roger (K8RI)
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