Distored audio from RM Station 550 Base amp.
Posted: 08 Aug 2018, 10:22
Hi Guys,
I have a head scratcher here for me and not sure what exactly is going on.
First off all the equipment I am using:
1.) Ranger RCI-2970 N2
2.) RM Station 550 Base linear.
3.) MFJ- 826B SWR/Watt Metre
4.) President Himalaya WB antenna mounted at 35 feet from the ground.
What I am currently doing:
1.) Ranger’s power is turned down to 4 Watts for FM / and between 12 and 15 Watts for SSB
2.) The Ranger is running from a 50 Amp PSU also.
3.) The mic gain is also set to around 45 to 50%
4.) On SSB on setting 6 of the amplifier the Amp is putting out around 550 Watts PEP and on setting 1 around 90 Watts PEP
5.) My antenna’s SWR through the 11 Metre band is no higher than 1.2, even when driving the amp.
What results I am getting:
1.) On FM the audio is perfect and the 4 Watts produces around 200 Watts.
2.) On SSB on any setting from 1 to 6 the audio sounds narrow, scratchy and distorted, I am using a friends stream around 5 miles away to test.
3.) I have checked coax, patch cables, made sure there is no RF coming back into the shack etc. and even switched over to the G5RV and the results are the same.
The RM Station 550 is mint and practically brand new as is the ranger and also the SS9900 I have tried with it.
Could the amp be faulty or what could be the issue, as I am out of ideas?
Thanks
Robbie
I have a head scratcher here for me and not sure what exactly is going on.
First off all the equipment I am using:
1.) Ranger RCI-2970 N2
2.) RM Station 550 Base linear.
3.) MFJ- 826B SWR/Watt Metre
4.) President Himalaya WB antenna mounted at 35 feet from the ground.
What I am currently doing:
1.) Ranger’s power is turned down to 4 Watts for FM / and between 12 and 15 Watts for SSB
2.) The Ranger is running from a 50 Amp PSU also.
3.) The mic gain is also set to around 45 to 50%
4.) On SSB on setting 6 of the amplifier the Amp is putting out around 550 Watts PEP and on setting 1 around 90 Watts PEP
5.) My antenna’s SWR through the 11 Metre band is no higher than 1.2, even when driving the amp.
What results I am getting:
1.) On FM the audio is perfect and the 4 Watts produces around 200 Watts.
2.) On SSB on any setting from 1 to 6 the audio sounds narrow, scratchy and distorted, I am using a friends stream around 5 miles away to test.
3.) I have checked coax, patch cables, made sure there is no RF coming back into the shack etc. and even switched over to the G5RV and the results are the same.
The RM Station 550 is mint and practically brand new as is the ranger and also the SS9900 I have tried with it.
Could the amp be faulty or what could be the issue, as I am out of ideas?
Thanks
Robbie