[TowerTalk] Tuner SWR won't stay down

[Roger (K8RI) on TT]

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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