I think the measure point is at the power cord.
I measured it at the fuse and measured it at the lowest the VR would go, say 460ma then upped it to 560ma, followed the list and now I dont hear the "crunchy" background noise.
RX is now the required 400ma
bias set.
View attachment 18043
That looks like a good place to start and should get you somewhere in the ballpark anyway.I did not find the service manual for this radio. does it have a mirror board in it?
found some info for it.
http://www.cbtricks.com/radios/stryker/sr_955hpc/graphics/SR-955HP alignment.pdf
thats exactly what I did.There is one back-door method.
Start with all the trimpots set to zero gate voltage.
Put a digital current meter in line with the radio's positive power wire.
Set mike gain to zero, select either USB or LSB and key the mike.
You will see a steady current draw. Advance the first trimpot until the reading climbs by 20 mA (0.020 Amp). Repeat this for each one.
You may desire more than 20 mA of idle current per MOSFET, but you should get the idea. Advancing each trimpot so that it raises the current reading by the amount each transistor should draw with no drive power.
73
I think the measure point is at the power cord.
I measured it at the fuse and measured it at the lowest the VR would go, say 460ma then upped it to 560ma, followed the list and now I dont hear the "crunchy" background noise.
RX is now the required 400ma
bias set.
View attachment 18043