RV1 is power output control, see PCB - not the blue twins, those are bias. Raj

Agree Bob, Similarly I stick a male N into a female BNC ! Raj

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

Bad antenna match! RF floating in the shack! Use a proper dummy load and test and see these things repeat!

#raduino #v6

Use a BNC male to SO239 female adapter. Always keep a bunch handy. Raj

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

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

The type number is SS34 - Farhan confirmed it earlier. Raj

#power #ubitxv6-help #v6

Jon, I always suggest a resistor in series with the center lad of the volume control. 1-10K.. try any value. Raj

#bitx40help #noise

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

#ubitxv6 #v6

Thats the correct drive level as I had measured at the input of the amp in some boards. Raj

#ubitxv6 #v6

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

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

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

#ubitxv6 #v6

Parasitic oscillation John! Keep all stray wires away from RF stage. Raj

#ubitxv6 #v6

I can understand Q90 failure, along with that other passive components failing ? strange! Raj

#ubitxv6 #v6

Base - Emitter junction is shorted. Replace transistor. Raj

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It was in the 70s!

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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

#ubitxv6 #v6

Yes, its 3904. You could use 2n2222 also. Raj

#ubitxv6 #v6