Date   
Re: Variable power control

Walter
 

A second thought and question about the zener voltages.

Is there a way to estimate what the output power in watts will be at various voltage levels? 

I need to get my Low setting below 3 watts so I can tune with my amp on, as tuning with the amp off for some reason the SWR changes when I turn this amp on.  However a mere 5 watts into this amp will give me a little over 100 watts out and that is over the tuning range of my LDG Auto Tuner. 

So, I need perhaps 2 or 3 watts out on low power.

Thanks.

Re: Variable power control

Walter
 

If you could draw this up that would be great.  I am no EE just a layman enjoying the hobby. 

From what I can tell Zeners are in the mAmp range and I thought I was told in an earlier post that I needed in the 3 to 5 amp range.  Perhaps you can tell me how this works out?  I'm sure there is a way.

I have a boost power supply I can put on my 13.8 VDC supply to boost this voltage up to 24 VDC or perhaps a little less to give me the maximum allowable voltage for the PA line (Again an earlier post by another with great advice).  I have ordered a 6 position rotary switch to mount on my front panel.  it is actually 2 pole rather than one so I thought I would use the other set of poles for LED's to show what power setting I am on, not necessary but LED's are always a fun add :)

You help will be greatly appreciated and a drawing would help me greatly.

Thanks and 73 W9KJO

Re: Erratic Tuning bitx40!

Jerry Gaffke
 

The voltage from the wiper pin (middle) of the tuning pot is read by an analog pin on the Nano
to determine tuning.  Measure the voltage from that pin to ground using a DVM, it should vary
smoothly from 0 volts with the pot fully counterclockwise to 5 volts when fully clockwise.

There is no "reset" that might cause this. 
If it worked before, then perhaps the wires from the pot got shorted or something.
The "something" means I have absolutely no idea, perhaps elves updated the firmware while you were sleeping?

Jerry


On Wed, Feb 21, 2018 at 05:07 am, <M0clscarl@...> wrote:
Hi, my bitx40 has decided to start tuning erraticly! It will tune itself in 10khz steps to the very top of the band or the bottom. And if it’s not doing that then it is jumping and tuning all over the place! One thing I have also noticed is that when first turning the radio on, the Radino with version number displays, it never used to? So I’m wondering if something has reset? Any ideas please? 

Re: Erratic Tuning bitx40!

Don, ND6T
 

What software are you using? The original? What version number displays?

Re: Connectors

Michael Hagen
 

Tayda has the best prices and stock.  Look under connectors, wafers, 2.54MM (0.1").

Find the 2 parts you want and buy pins.  So 3 items per size (Pins).  Watch out, there a 90 Degree headers.

Pins are 3 Cents.  I really like Tayda for connectors, I have bought over $300 of them!

Sometimes you get a cream color, I like the white, but you get what you get!

Mike, WA6ISP


On 2/20/2018 9:57 PM, Raj vu2zap wrote:
See if you can order it from VU ebay or amazon..

https://www.ebay.in/sch/i.html?_from=R40&_trksid=m570.l1313&_nkw=relimate&_sacat=0

https://www.amazon.in/s/ref=nb_sb_noss?url=search-alias%3Daps&field-keywords=relimate


At 21/02/2018, you wrote:
Mike

I looked at the connectors at Tayda.  It looked like you only get one side of it, the side
with the pins already installed.  What is the part number or numbers that get both halves?

thanks,

Paul 





-- 
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID  "MotDog@..."
Mike@...

Re: RD16HHF1 in the uBITX #ubitx

VE7WQ
 

Thank you Jack,



73! George

VE7WQ


Wednesday, February 21, 2018, you wrote:

JPvGI> Don't know about the tape...never tried it, but I don't see why it wouldn't work.

JPvGI> Jack, W8TEE


Re: RD16HHF1 in the uBITX #ubitx

Jack, W8TEE
 

Don't know about the tape...never tried it, but I don't see why it wouldn't work.

Jack, W8TEE



From: VE7WQ <v@...>
To: BITX20@groups.io
Sent: Wednesday, February 21, 2018 12:07 AM
Subject: Re: [BITX20] RD16HHF1 in the uBITX

Thank you Jack,

I ordered a SMT SMD Component Welding Practice Board Kit US $0.99

Question, could I use this tape:
Self-adhesive Tape Soldering High Temperature Heat Resistant for BGA PCB SMT US $0.99
with my Hakko FX-901 Cordless Soldering Iron to solder SMTs, SMDs?

73! George
VE7WQ

Tuesday, February 20, 2018, you wrote:
JPvGI> Sorry about that. See ebay #192343157603 and picture at bottom.
JPvGI> Jack, W8TEE





JPvGI> #yiv0457961818 #yiv0457961818 --body {margin:5px 5px 5px
JPvGI> 5px;background-color:#fdf4d7;}#yiv0457961818 #yiv0457961818 hr
JPvGI> {color:#000000;}#yiv0457961818 body, #yiv0457961818 table #yiv0457961818
JPvGI> {font-size:12pt;font-style:normal;font-weight:normal;color:#000000;text-decoration:none;}#yiv0457961818
JPvGI> span.yiv0457961818rvts1 #yiv0457961818
JPvGI> {font-size:10pt;font-weight:bold;color:#0000ff;}#yiv0457961818
JPvGI> span.yiv0457961818rvts2 #yiv0457961818
JPvGI> {font-size:10pt;font-weight:bold;color:#000080;}#yiv0457961818
JPvGI> span.yiv0457961818rvts3 #yiv0457961818
JPvGI> {font-size:10pt;font-style:italic;color:#800000;}#yiv0457961818
JPvGI> a.yiv0457961818rvts4, #yiv0457961818 span.yiv0457961818rvts4
JPvGI> #yiv0457961818
JPvGI> {font-size:10pt;color:#008000;text-decoration:underline;}#yiv0457961818
JPvGI> a.yiv0457961818rvts5, #yiv0457961818 span.yiv0457961818rvts5
JPvGI> #yiv0457961818
JPvGI> {font-size:10pt;color:#008000;text-decoration:underline;}#yiv0457961818
JPvGI> span.yiv0457961818rvts6{font-style:italic;color:#ff0000;}#yiv0457961818
JPvGI> span.yiv0457961818rvts7{font-style:italic;color:#ff0000;}#yiv0457961818
JPvGI> a.yiv0457961818rvts8, #yiv0457961818
JPvGI> span.yiv0457961818rvts8{color:#0000ff;text-decoration:underline;}#yiv0457961818
JPvGI> #yiv0457961818 p, #yiv0457961818 ul, #yiv0457961818 ol #yiv0457961818
JPvGI> {text-align:left;text-indent:0px;padding:0px 0px 0px 0px;margin:0px 0px
JPvGI> 0px 0px;}#yiv0457961818 .yiv0457961818rvps1 #yiv0457961818
JPvGI> {text-align:center;}#yiv0457961818 Hello Jack,
JPvGI> With three of what? No picture (:The whole thing cost $2.29 with free shipping!URL please.
JPvGI> 73! GeorgeVE7WQ
JPvGI> Tuesday, February 20, 2018, you wrote:JPvGI> I've run into the SMT
JPvGI> inertia as well. AT our club meeting next month, IJPvGI> am setting up
JPvGI> three solder stations with three of these:
JPvGI>> and I'm going to have the members each solder as small a part as theyJPvGI> can handle. I think once they do it, they will see how easy it really is.JPvGI> BTW, when done and voltage is applied at the bottom center of the wheel,JPvGI> the LED's should light up. The whole thing cost $2.29 with free shipping!JPvGI> Once they see how easy it is, then I'm going to push how cheap the SMT's are.JPvGI> Jack, W8TEE






Virus-free. www.avast.com

Re: Variable power control

LKNDAVE
 

simple series pass regulator on PA supply line.
i would probably go with 4 zeners on a 4 pole rotary. ie: 5.6, 9.1, 12.0 and 15 volts so then the output is "adjustable," with fixed known intervals. 100uh rf choke on output should choke the rf backfeed from the supply. a hidden benefit is this is also a capacitor multiplier that will use the transistors gain to multiply its effective capacitance. ie, a 100 ufd cap on the base of the pass transistor will be like a 1000 ufd cap based on hfe gain of 10. using a npn darlington with a gain of 1000 makes the effect crazy like 100 ufd x hfe 1000 = effective capacitance like 10,000 ufd. smooth baby smooth output.
i miight draw this up if interested 
if using a 12v supply maybe 2 or 3 position switch might do it for you. the darling will lose .7 volts so if you have a 12.00 volt supply you will get ~ 11.3 out

dave, n4lkn

Erratic Tuning bitx40!

Jodannastreet1985@...
 

Hi, my bitx40 has decided to start tuning erraticly! It will tune itself in 10khz steps to the very top of the band or the bottom. And if it’s not doing that then it is jumping and tuning all over the place! One thing I have also noticed is that when first turning the radio on, the Radino with version number displays, it never used to? So I’m wondering if something has reset? Any ideas please? 

Many thanks Carl M0CLS 

Re: Connectors

DaveC <murzim@...>
 

That should be Molex KK series connectors

Re: Connectors

DaveC <murzim@...>
 

search eBay for Molex ok series connectors. You want the ones with 2.54mm pin spacing

Re: uBITx shipping and all

Lawrence Galea
 

Disgusting Scrooges and Grinches
Most authorities these days would make you pay to breathe.


On Wed, Feb 21, 2018 at 7:03 AM, K9HZ <bill@...> wrote:

 

So I’m a big proponent of getting younger people involved in ham radio and to that end, I support the YOTA (youth on the air) initiative.  To that end I like donating time and radios to that cause, and what better first radio for a young ham than a nice new uBITx.  So in December, I ordered five uBITx transceivers to give away to young people on the island of St. Lucia (J6) where I have a retirement villa and nice radio station.  I work with another Ham on the island to bring in equipment that is difficult for hams to get there.  Well this week those five uBITx radios arrived and were stuck in customs until my friend there retrieved them.  The issue was, though, even though these radios were gifts for kids for learning… the St. Lucian government charged my friend $551 US Dollars today as import tax on those “FREE” radios.  Incredible.  I’ll have to make this right with him, but it’s getting harder and harder in today’s world to help people that need it.

 

 

Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ

 

Owner - Operator

Big Signal Ranch – K9ZC

Staunton, Illinois

 

Owner – Operator

Villa Grand Piton – J68HZ

Soufriere, St. Lucia W.I.

Rent it: www.VillaGrandPiton.com

Like us on Facebook! facebook icon

 

Moderator – North American QRO Yahoo Group.

 

email:  bill@...

 

 


Virus-free. www.avg.com


Re: RD16HHF1 in the uBITX #ubitx

Glenn
 

This might be of interest to those trying alternate FET's or just trying to improve response of the driver stages.

This is a sweep of the driver stages in my uBITX.

I disconnected the input to the stages and coupled in a spectrum analyzer, with tracking generator at C80.

The two caps driving the FET's were removed and this output fed to the Spectrum Analyzer. For the purposes of the test, I assumed that the impedances are 50R.

The green line on the picture is the 0dB gain point, so the markers (3 of them) directly indicate the gain over the range from 1MHz to 40MHz. As you can see, gain falls of around 7dB at 30MHz.

Glenn
vk3pe



uBITx shipping and all

K9HZ <bill@...>
 

 

So I’m a big proponent of getting younger people involved in ham radio and to that end, I support the YOTA (youth on the air) initiative.  To that end I like donating time and radios to that cause, and what better first radio for a young ham than a nice new uBITx.  So in December, I ordered five uBITx transceivers to give away to young people on the island of St. Lucia (J6) where I have a retirement villa and nice radio station.  I work with another Ham on the island to bring in equipment that is difficult for hams to get there.  Well this week those five uBITx radios arrived and were stuck in customs until my friend there retrieved them.  The issue was, though, even though these radios were gifts for kids for learning… the St. Lucian government charged my friend $551 US Dollars today as import tax on those “FREE” radios.  Incredible.  I’ll have to make this right with him, but it’s getting harder and harder in today’s world to help people that need it.

 

 

Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ

 

Owner - Operator

Big Signal Ranch – K9ZC

Staunton, Illinois

 

Owner – Operator

Villa Grand Piton – J68HZ

Soufriere, St. Lucia W.I.

Rent it: www.VillaGrandPiton.com

Like us on Facebook! facebook icon

 

Moderator – North American QRO Yahoo Group.

 

email:  bill@...

 

 


Virus-free. www.avg.com

Re: Connectors

 

At 21/02/2018, you wrote:
Mike

I looked at the connectors at Tayda. It looked like you only get one side of it, the side
with the pins already installed. What is the part number or numbers that get both halves?

thanks,

Paul

Re: rv2- messed up setting and txing like mad!!!

 

As I remember my uBitx with everything wired correctly and 4.7K omitted the board
would go didahdiah indefinitely.

One board came with a defective USB socket which I fixed. After a 10 days stint at
my farm and back the board was refusing to program but running fine with my old
experimental sketch. A reset completely bricked it. I desoldered the Nano from the
nano side and cleaned the (raduino) pins well. I then plugged in a new nano but did not solder
it as it a tight fit. Uploaded the sketch into it and glad to say all is well with it now.

The spare nano I used was without pins soldered. Something like this:
https://www.amazon.co.uk/Arduino-Elegoo-board-ATmega328P-compatible/dp/B072BMYZ18/ref=sr_1_3?ie=UTF8&qid=1519187490&sr=8-3&keywords=arduino+nano



Raj

At 20/02/2018, you wrote:
Hi Raj and thank you! It was all ok on receive up until today. Once the raduino is plugged into ubitx it goes haywire and just goes on and of so can't even get as far as receive.

It seems tied in more with the broken 4.7k

Can you buy spare raduinos? or how do I go about fixing a fault relating to 4.7k malfunction?

Thank you

Alan

Re: My uBitx shipped today

Methas
 

Thanks for updating the shipment status. I ordered on Feb 04. Still wating and exciting to work on uBITX.

E21TUX

Re: RD16HHF1 in the uBITX #ubitx

VE7WQ
 

Thank you Eric,


What do you think about this heat gun on eBay?

110V 300W Hot Air Gun Hand Hold Mini Heat Gun for Embossing Heat Tool $10.76

https://tinyurl.com/y7vrbfvt

Or should I buy a $20 embossing tool (heat gun) from WalMart or any craft store ?


73! George

VE7WQ


Tuesday, February 20, 2018, among other things you wrote:

EK> A syringe, a small tweezer to place the parts, solder paste and a $20 

EK> embossing tool (heat gun) from WalMart or any craft store. It makes the 

EK> 20-QFN or any other SMT easy. 

Re: RD16HHF1 in the uBITX #ubitx

VE7WQ
 

Thank you Jack,


I ordered a SMT SMD Component Welding Practice Board Kit US $0.99

http://tinyurl.com/ya7l9hym


Question, could I use this tape:

Self-adhesive Tape Soldering High Temperature Heat Resistant for BGA PCB SMT US $0.99

https://tinyurl.com/yak4p4ea

with my Hakko FX-901 Cordless Soldering Iron to solder SMTs, SMDs?


73! George

VE7WQ


Tuesday, February 20, 2018, you wrote:

JPvGI> Sorry about that. See ebay #192343157603 and picture at bottom.

JPvGI> Jack, W8TEE



v@...>

BITX20@groups.io




JPvGI> #yiv0457961818 #yiv0457961818 --body {margin:5px 5px 5px

JPvGI> 5px;background-color:#fdf4d7;}#yiv0457961818 #yiv0457961818 hr

JPvGI> {color:#000000;}#yiv0457961818 body, #yiv0457961818 table #yiv0457961818

JPvGI> {font-size:12pt;font-style:normal;font-weight:normal;color:#000000;text-decoration:none;}#yiv0457961818

JPvGI> span.yiv0457961818rvts1 #yiv0457961818

JPvGI> {font-size:10pt;font-weight:bold;color:#0000ff;}#yiv0457961818

JPvGI> span.yiv0457961818rvts2 #yiv0457961818

JPvGI> {font-size:10pt;font-weight:bold;color:#000080;}#yiv0457961818

JPvGI> span.yiv0457961818rvts3 #yiv0457961818

JPvGI> {font-size:10pt;font-style:italic;color:#800000;}#yiv0457961818

JPvGI> a.yiv0457961818rvts4, #yiv0457961818 span.yiv0457961818rvts4

JPvGI> #yiv0457961818

JPvGI> {font-size:10pt;color:#008000;text-decoration:underline;}#yiv0457961818

JPvGI> a.yiv0457961818rvts5, #yiv0457961818 span.yiv0457961818rvts5

JPvGI> #yiv0457961818

JPvGI> {font-size:10pt;color:#008000;text-decoration:underline;}#yiv0457961818

JPvGI> span.yiv0457961818rvts6{font-style:italic;color:#ff0000;}#yiv0457961818

JPvGI> span.yiv0457961818rvts7{font-style:italic;color:#ff0000;}#yiv0457961818

JPvGI> a.yiv0457961818rvts8, #yiv0457961818

JPvGI> span.yiv0457961818rvts8{color:#0000ff;text-decoration:underline;}#yiv0457961818

JPvGI> #yiv0457961818 p, #yiv0457961818 ul, #yiv0457961818 ol #yiv0457961818

JPvGI> {text-align:left;text-indent:0px;padding:0px 0px 0px 0px;margin:0px 0px

JPvGI> 0px 0px;}#yiv0457961818 .yiv0457961818rvps1 #yiv0457961818

JPvGI> {text-align:center;}#yiv0457961818 Hello Jack,

JPvGI> With three of what? No picture (:The whole thing cost $2.29 with free shipping!URL please.

JPvGI> 73! GeorgeVE7WQ

JPvGI> Tuesday, February 20, 2018, you wrote:JPvGI> I've run into the SMT

JPvGI> inertia as well. AT our club meeting next month, IJPvGI> am setting up

JPvGI> three solder stations with three of these:

JPvGI>> and I'm going to have the members each solder as small a part as theyJPvGI> can handle. I think once they do it, they will see how easy it really is.JPvGI> BTW, when done and voltage is applied at the bottom center of the wheel,JPvGI> the LED's should light up. The whole thing cost $2.29 with free shipping!JPvGI> Once they see how easy it is, then I'm going to push how cheap the SMT's are.JPvGI> Jack, W8TEE




RD16HHF1 in the uBITX or something like that...

K9HZ <bill@...>
 

Yes but the difference, at least for me, is that I’ve used the AD8367 in designs before so I know the quirks and benefits of that part.  I’ve never used the PE3412 but I sure will give it a try.  One alone doesn’t appear to have enough attenuation for a reasonable AGC and there is the question as to if the feedback loop passed back through a processor and via the I2C buss would be fast enough for a good AGC.  I am actually working on a true RF AGC for the uBITx right now using the AD8367 variable attenuator and the AD8361 RMS Detector with low pass filter.  It’s analog.  Just had to add an integrator in the loop (op amp) to get a picture perfect RF AGC circuit with only three parts that fit on a form just a little bigger than a quarter.  Just testing it now.  Seems to work like a charm!

 

 

Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ

 

Owner - Operator

Big Signal Ranch – K9ZC

Staunton, Illinois

 

Owner – Operator

Villa Grand Piton – J68HZ

Soufriere, St. Lucia W.I.

Rent it: www.VillaGrandPiton.com

Like us on Facebook! facebook icon

 

Moderator – North American QRO Yahoo Group.

 

email:  bill@...

 

 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of RCBoatGuy via Groups.Io
Sent: Tuesday, February 20, 2018 2:46 PM
To: BITX20@groups.io
Subject: Re: [BITX20] RD16HHF1 in the uBITX

 

The AD8367 is more than twice as expensive as the PE4312, though the AD8367 datasheet does show how to implement AGC with it using 2 additional chips.  So if you want to include AGC with programmable attenuation, the AD8367 may be the way to go.

However, for less than the cost of a single AD8367 you can put two PE3412's in series to get attenuation up to 62dB.  

Not sure what the best trade-off is.  Depends on your needs and price range, I guess.

Carl,
K0MWC


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