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Date

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:
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

 

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:
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

 

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:

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)
--
Ion

VA3NOI



Re: Attachments

G4NQX
 

Strange that. Just clicking on them should open a dialogue as to whether you want to view or save them.?? Providing you have the relevant program to view them. i.e. Word for the .doc format they should open.


--
Rob G4NQX


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

G4NQX
 

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)
--
Ion

VA3NOI


Attachments

N7PXY
 

Gentlemen,

First i must say I am a complete computer clutz.... I kid you not.

My problem is that I cannot open any of the attachments to the posts. What is the trick or process?


tnx, 73

PJH, N7PXY


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:

That's one of the most helpful things I've seen here.

I'll be comparing mine with this stock data.

Keeping in mind my DMM is like a hand grenade.

Does yours have the expected current and wattage measurements?



Re: No output Bitx40 raduino

 

On Mon, Feb 6, 2017 at 11:16 am, Jerry Gaffke wrote:

Chuck,

You ever get that thing working? ? I believe this is the last we heard from you.

Yes, IT'S ALIVE!? Seems to be working as it should.? I've been checking into Noon Time Net 7.2685.? Today I got S5 report.? I'm close to Tacoma, Wa; they are in Reno, Nevada.? Also doing some testing with other local Bitx40 owners.? Things are good.

On Tue, Jan 31, 2017 at 09:55 am, Chuck Kemmer wrote:

Rig relays are working. ?Both PWR and display had bad ground while PA PWR had good ground.

?

?


Re: Tips n Mods update

G4NQX
 

Ross,

Look in the loop function right at the bottom of the code around line 625

/*
? checkCW();
? checkTX();
? checkButton(); */


Remove the /* and */ to make the functions active
--
Rob G4NQX


Re: BITX40 Transistor Voltage Measurements

 

That's one of the most helpful things I've seen here.

I'll be comparing mine with this stock data.

Keeping in mind my DMM is like a hand grenade.

Does yours have the expected current and wattage measurements?


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:

Hi Randy,

Thanks for that.? I will include them in the Tips doc.? I'm hoping at least two others will do the same so we can have a typical set of voltages.
--
Rob G4NQX



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

Randy, K7AGE


Re: BITX40 Transistor Voltage Measurements

Jim Schliestett
 

¿ªÔÆÌåÓý

Wow Randy, way to go, thanks.

?

From: [email protected] [mailto:[email protected]] On Behalf Of Randy Hall
Sent: Monday, February 06, 2017 2:44 PM
To: [email protected]
Subject: [BITX20] BITX40 Transistor Voltage Measurements

?

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,

Randy, K7AGE

?


Re: BITX40 Transistor Voltage Measurements

G4NQX
 

Hi Randy,

Thanks for that.? I will include them in the Tips doc.? I'm hoping at least two others will do the same so we can have a typical set of voltages.
--
Rob G4NQX


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,


--
Ion

VA3NOI


Re: BITX40 Transistor Voltage Measurements

 

Thanks Randy!