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Low power transmission gets distorted
RV1 is power output control, see PCB - not the blue twins, those are bias. Raj
RV1 is power output control, see PCB - not the blue twins, those are bias. Raj
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Raj vu2zap
· #86551
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Replacing BNC with SO-239
Agree Bob, Similarly I stick a male N into a female BNC ! Raj
Agree Bob, Similarly I stick a male N into a female BNC ! Raj
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By
Raj vu2zap
· #86548
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Replacing BNC with SO-239
Bob, BNC is Bayonet N Connector, it locks in place. Never had to glue one !!. Best way to go IF your antenna cable is RG8/213 is to make a RG58 jumper about 2 meters long with one end BNC male and the
Bob, BNC is Bayonet N Connector, it locks in place. Never had to glue one !!. Best way to go IF your antenna cable is RG8/213 is to make a RG58 jumper about 2 meters long with one end BNC male and the
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By
Raj vu2zap
· #86545
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Strange issues on v6 transmit, display acts like it is being pressed
#raduino
#v6
Bad antenna match! RF floating in the shack! Use a proper dummy load and test and see these things repeat!
Bad antenna match! RF floating in the shack! Use a proper dummy load and test and see these things repeat!
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Raj vu2zap
· #86536
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Replacing BNC with SO-239
Use a BNC male to SO239 female adapter. Always keep a bunch handy. Raj
Use a BNC male to SO239 female adapter. Always keep a bunch handy. Raj
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By
Raj vu2zap
· #86518
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New uBitx 6 up and running!
Clay, Probably thousands or tens of thousands were sold. The problematic ones are ones you read about here and rest would have worked out of the box. Raj, vu2zap
Clay, Probably thousands or tens of thousands were sold. The problematic ones are ones you read about here and rest would have worked out of the box. Raj, vu2zap
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By
Raj vu2zap
· #86515
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Linear Amp Idea
I have had a bad experience with Bangood. Ordered a charger for my sons drone. About 100 bucks. Received it and when switched on & not working and a faint burnt smell. I asked for replacement or refun
I have had a bad experience with Bangood. Ordered a charger for my sons drone. About 100 bucks. Received it and when switched on & not working and a faint burnt smell. I asked for replacement or refun
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By
Raj vu2zap
· #86441
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What is the value of "D6" the reverse polarity diode on the v6?
#power
#ubitxv6-help
#v6
The type number is SS34 - Farhan confirmed it earlier. Raj
The type number is SS34 - Farhan confirmed it earlier. Raj
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By
Raj vu2zap
· #86325
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Bitx40 High volume oscillations
#bitx40help
#noise
Jon, I always suggest a resistor in series with the center lad of the volume control. 1-10K.. try any value. Raj
Jon, I always suggest a resistor in series with the center lad of the volume control. 1-10K.. try any value. Raj
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By
Raj vu2zap
· #86265
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uBitx v6 board failure--suggestions?
#ubitxv6
#v6
Arv, Currently for 24V on finals, the RF drive is not enough. I found that increasing the PS voltage to the main board circuit to 15V increases the power out. It can blow your audio chip depending on
Arv, Currently for 24V on finals, the RF drive is not enough. I found that increasing the PS voltage to the main board circuit to 15V increases the power out. It can blow your audio chip depending on
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By
Raj vu2zap
· #86250
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uBitx v6 board failure--suggestions?
#ubitxv6
#v6
Thats the correct drive level as I had measured at the input of the amp in some boards. Raj
Thats the correct drive level as I had measured at the input of the amp in some boards. Raj
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By
Raj vu2zap
· #86231
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Variable output power
Here is an schematic of an idea for variable output power that some of you wanted. All parts are common except the varicap/varactor diode. You could probably use one salvaged from an AM radio. I have
Here is an schematic of an idea for variable output power that some of you wanted. All parts are common except the varicap/varactor diode. You could probably use one salvaged from an AM radio. I have
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By
Raj vu2zap
· #86147
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Screen no longer boots�only blue grey now
One way to isolate a smd chip is to heat the power in pin and use the edge of a box cutter blade and gently lift up the chip pin from the board just enough to isolate the pin. This way it can be check
One way to isolate a smd chip is to heat the power in pin and use the edge of a box cutter blade and gently lift up the chip pin from the board just enough to isolate the pin. This way it can be check
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By
Raj vu2zap
· #86099
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uBitx v6 board failure--suggestions?
#ubitxv6
#v6
I would put on pin 12 of K1 so that only in RX it comes into the picture. You can determine which line connects K1 to K3 and determine pin 12! Raj
I would put on pin 12 of K1 so that only in RX it comes into the picture. You can determine which line connects K1 to K3 and determine pin 12! Raj
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By
Raj vu2zap
· #86059
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uBitx v6 board failure--suggestions?
#ubitxv6
#v6
Parasitic oscillation John! Keep all stray wires away from RF stage. Raj
Parasitic oscillation John! Keep all stray wires away from RF stage. Raj
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By
Raj vu2zap
· #86002
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uBitx v6 board failure--suggestions?
#ubitxv6
#v6
I can understand Q90 failure, along with that other passive components failing ? strange! Raj
I can understand Q90 failure, along with that other passive components failing ? strange! Raj
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By
Raj vu2zap
· #85999
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uBitx v6 board failure--suggestions?
#ubitxv6
#v6
Base - Emitter junction is shorted. Replace transistor. Raj
Base - Emitter junction is shorted. Replace transistor. Raj
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By
Raj vu2zap
· #85998
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uBitx v6 board failure--suggestions?
#ubitxv6
#v6
It was in the 70s!
By
Raj vu2zap
· #85969
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uBitx v6 board failure--suggestions?
#ubitxv6
#v6
Lawrence, Most likely a fake. I have had some 3866 which tested fine in a tester but would not amplify RF. I also have fake IRFs now in a separate box for fakes!! Long time ago we had a store in town
Lawrence, Most likely a fake. I have had some 3866 which tested fine in a tester but would not amplify RF. I also have fake IRFs now in a separate box for fakes!! Long time ago we had a store in town
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By
Raj vu2zap
· #85967
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uBitx v6 board failure--suggestions?
#ubitxv6
#v6
Yes, its 3904. You could use 2n2222 also. Raj
Yes, its 3904. You could use 2n2222 also. Raj
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By
Raj vu2zap
· #85962
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