SWR Problem

[AK #5]

I have a Radiooddity QT 60 connected to a Tram 1498 via 50' of TM LMR 400. I connected it to my Maverick 250, then my LP 100A after the amplifier. The radio sees an SWR over 3.5 with the amp on, but the LP 100A reads 1.4. at the output. Without the amplifier online, the radio and LP 100A see 1.3. If the radiio is seeing an SWR of 3.5, I assume it's not safe to run it. My question, is what are the possible causes?

 

[Shadetree Mechanic]

If the radio sees high SWR with the amp on, and normal swr with it off, then the amp input is out of tune. How much drive are you giving the amp from the radio?

 

[dave457]

I agree... amps input tuning is not correct

 

[AK #5]

2W deadkey, 18W PEP. The grid tune knob does nothing when trying to adjust it. I thought that in itself was strange. This amp was shipped to me, and I'm wondering what got damaged in shipment.

 

[dave457]

That's a very old tube amp. Probably needs an alignment and tubes need to be checked

 

[AK #5]

That's a very old tube amp. Probably needs an alignment and tubes need to be checked

It was looked over by a tech before shipping. I set the dead key at 80W but it changes energy time I key up. Something isn't right worth it, so I'm not going to use it until I get it checked out.