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Re: BITX40 Transistor Voltage Measurements
M Garza
I am not shy either, I just do not have my radio yet.? It should be here, any day now.... Marco - KG5PRT? On Feb 6, 2017 7:05 PM, "Jack Purdum via Groups.Io" <econjack=[email protected]> wrote:
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Re: BITX40 Transistor Voltage Measurements
Jack A couple of books arrived today. Lots to dig through. Randy, K7AGE On Mon, Feb 6, 2017 at 5:04 PM, Jack Purdum via Groups.Io <econjack@...> wrote:
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Re: BITX40 Transistor Voltage Measurements
Ion I'm amazed that our measurements were so close. Thanks for taking the time to measure. Randy, K7AGE On Mon, Feb 6, 2017 at 4:39 PM, Ion Petroianu <ion.petroianu@...> wrote:
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Re: BITX40 Transistor Voltage Measurements
Jack Purdum
Right now, for me it's not a question of being shy. It's a question of body parts lying all over the bench right now. All I need is some time to get the body parts together and a lightning storm so I can yell: "IT'S ALIVE!". Jack, W8TEE From: G4NQX <tasmod@...> To: [email protected] Sent: Monday, February 6, 2017 7:50 PM Subject: Re: [BITX20] BITX40 Transistor Voltage Measurements When I originally asked for this I was hoping for a flood of participants, seems they are all shy :-) OK that's two then agreeing voltages.? I would be happy if we could get one more agreeing then I will put it in Tips n Mods. Thanks guys.
-- Rob G4NQX |
Re: BITX40 Transistor Voltage Measurements
I can confirm Randy's results, except for Gate of Q15. Mine is only 4.3V, but that is maybe due to my adjusting the idle current to exactly 0.1A. All other measurements are within 0.1V error, that can be a meter issue or small variations due to component tolerances. The method and conditions of measurements are the same the same (GND at power jack, power at PWR1 (not PA PWR, 13.7V in receive, 13.6V in transmit) VA3NOI |
Re: BITX40 Transistor Voltage Measurements
John Thanks, my DMM does do current measurements.? I use either my LP-100A or Diamond SX-600 for RF power measurements. Randy On Mon, Feb 6, 2017 at 3:20 PM, John Smith via Groups.Io <johnlinux77@...> wrote:
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Re: No output Bitx40 raduino
On Mon, Feb 6, 2017 at 11:16 am, Jerry Gaffke wrote:
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Re: Tips n Mods update
Hi Rob: Thanks for all the great info, however I have been looking for the commented lines that turn on the Radiono features, I can't seem to find them. I am sure that there are Bitxers that interested ?in these features. Any help is greatly appreciated. Thanks and 73 Ross Bell K7RSB |
Re: Possible PA low output problem.
24W was a peak reading of the needle on the meter when it jumped up. I should have said 18W to 12W, depending on what part of HellOoo I say. I won't be getting another cheap MFJ meter again. I don't think the bitx is worth buying more expensive measurement equipment for. What I got shows the bitx has promising signs of life. But I'll pass a note on to Santa for better equipment. |
Re: BITX40 Transistor Voltage Measurements
Rob, They can use the spreadsheet and replace my data with their data. Thanks for including the data. Randy On Mon, Feb 6, 2017 at 1:12 PM, G4NQX <tasmod@...> wrote:
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BITX40 Intermittent power connector
Hi While taking my transistor measurements this morning I noticed that my supplied power connector was intermittent. I was hearing a lot of static in the speaker and flicking display LEDS when I wiggled the connector.? I had a 5/5/2/1 mm connector with a 9 V battery that fit more tightly than the other connector. And, no intermittent power. So, I changed out what I believe is a 5.5/2.5 mm connector for a 5.5/2.1 mm connector. Photo attached. Supplied connector on left?new connector on right. Now on to other projects... 73 |
Re: BITX40 Transistor Voltage Measurements
Jim Schliestett
¿ªÔÆÌåÓýWow Randy, way to go, thanks. ? From: [email protected] [mailto:[email protected]] On Behalf Of Randy Hall ? Hi I measured all the transistor voltages for both receive and transmit and entered all that data into a document. I believe my BITX40 is operating normally.? Please let me know of any errors. I will upload this into the FILE section when we are allowed. Enjoy, ? |
Re: Possible PA low output problem.
John, For sure it is something wrong with your measurement tools. You cannot put out 24W when your input power is less than 20W. I suspect your multimeter is not measuring DC current very well.?Try the indirect measurement method, using a small resistor in series with the power line and measure the voltage across it. 1 Ohm 5W resistor ?shall give you decent voltage reading. I did not measure my current at higher voltage, but a decent estimate is at least 2A. The PA is a linear amplifier working in AB class. The efficiency of it is 50% at best. Best regards,
VA3NOI |