You can measure the driver bias at the Emitter of Q5, or at pin #2 of
U1a, or at the junction of L1 and L2. I'd say about 0.7 volts is
about correct. Ideally you would do a 2 tone IMD test to determine the
best value. But for most devices, 0.7 volts is good enough.
Good luck in getting the radio going.
73
Bob, K4TAX
On 8/30/2018 7:55 AM, mark kenward via TenTec wrote:
Apparently, Gary Greene had said that you can bias finals and drivers in the Jupiter by measuring ,7 volts at r21 which is a stand up resistor and easily located, and r23 which I cannot locate.
Can someone tell me or show a picture where r23 is in the final compartment?
I have substitute drivers in the rig, but for the life of me I cannot locate r23
The transistor I am using is a 1945 which shows as a substitute and ,
hopefully, will put the Jupiter back on the air.
Ten Tec sent it back because they cannot locate the proper 3133 drivers,
therefore the rig is un repairable.
Thank you all for your help.
markK8VF
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