[TowerTalk] Tuner SWR won't stay down

[David Gilbert]

Put a different SWR meter (not a tuner) in front of the MFJ-989C so you 
can see if it's simply the meter circuitry in the 989C that's acting weird.

Dave  AB7E



>> On Jan 1, 2015, at 3:09 PM, Tom Osborne <w7why at frontier.com> 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
>>