Re: VARA HF digital on BitX
That¡¯s how I feel sometime when learning radio electronics. :)
Have a look yourself.?
How
toggle quoted message
Show quoted text
On Feb 24, 2018, at 8:58 PM, Michael Hagen < motdog@...> wrote:
Oh My, what language
was that in, didn't get one word understood!? Martian perhaps?
Oh, I am so Obsolete!?
Soilent Green Time?
Hi .. Hi.. Hi...
Mike WA6ISP (Remembering my
favorite Band Dire Straights and Mark Knofler ,? Dire Wolf
never had a #1 cut?)
On 2/24/2018 5:39 PM, Joe Puma wrote:
If you want to try another method, I had success with a raspberry
pi running Dire Wolf a software TNC and I am able to control a
uhv/vhf Radio with and I used a ft-840 with success for winlink on
HF. ?I ran the RMS express from a Windows PC and connect to the
Rpi/direwolf via tcpip and used the Winmore mode with ease on HF.
?
I had a Bitx40 on a raspberry pi already with wsjtx and can
do ptt with a com port but now that ubitx has CAT control it
makes it even easier. ?
On Feb 24, 2018, at 8:29 PM, KC9SGV < kc9sgv@...>
wrote:
Hi All,
Have a look at VARA.
It is a new Milspec digital mode adjusted for the U.S.
HF (or VHF) ham bands.
Meaning it satisfies all the current FCC legal
requirements for HF digital.
< 300 baud, < 2.4 KHz bandwidth.
52 Carriers in orthogonally spaced subcarriers.
Multiple OS platforms.
Thruput speeds comparable with P3.....
Full Winlink functionality using the Winlink Express
radio email client in Telnet mode.
"VARA is a High Performance HF modem based on OFDM
modulation. VARA Modem, brings state of the art
Military grade technology to new and existing HF data.
Introduces a new standard of technology available for
Amateur and Commercial use. Designed for operation
within a SSB Bandwidth of 2400 Hz."
(Scroll down)
Who would be the first to run VARA on a BitX radio ?
Please post the results (with pictures) here.
?
Bernie,
KC9SGV
?
?
--
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID "MotDog@..."
Mike@...
|
I ordered 5 TDA2822M IC's with sockets and several 2.2 ohm resistors for R75.? I intend to use the IC sockets.?
Tomorrow I'm going to pull U1 and R75 from the board and use a signal tracer to see if I am getting audio into this stage.? I think I should be able to pick off the signal at the wiper of the volume control (?).? Is there any risk to doing this?
After the parts are replaced I plan to use the bench supply to bring the voltage up slowly and carefully watch and monitor temperature after I replace U1 and R75.? I was fiddling with speaker jack and don't remember the exact sequence of events before the catastrophic failure.? I will report back after the parts come in.? Thanks for the replies guys.
|
Seems good John, but you could have retained the original white paint, It is easy to remove the labels which are screen painted and can be removed by applying some petrol on a piece of cloth and just removing the label, this process does not effect the color on the panel.
Sunil VU3SUA
https://amateurradiokits.in
|
My thoughts too, Jerry. I
suspect that the uBITX is many builders' first exposure to double
sided boards with plated through holes.
Bill, VK7MX
On 25/02/2018 11:03 AM, Jerry Gaffke
via Groups.Io wrote:
toggle quoted message
Show quoted text
I suspect that
solder job is just fine,?
Have you gotten around to looking at those pins from the bottom of
the board?
The surface mount parts are autostuffed.
The through-hole parts are then hand-added.
All you need is a good fillet of solder connecting pin to pad on
the back of the board
where the hand soldering job was carried out,
On Sat, Feb 24, 2018 at 03:37 pm, John wrote:
I used my phone to look closely at U1 and was shocked
about the soldering. So guess while waiting for parts I can
check all soldering and create a case.
|
Re: VARA HF digital on BitX
Oh My, what language
was that in, didn't get one word understood!? Martian perhaps?
Oh, I am so Obsolete!?
Soilent Green Time?
Hi .. Hi.. Hi...
Mike WA6ISP (Remembering my
favorite Band Dire Straights and Mark Knofler ,? Dire Wolf
never had a #1 cut?)
On 2/24/2018 5:39 PM, Joe Puma wrote:
If you want to try another method, I had success with a raspberry
pi running Dire Wolf a software TNC and I am able to control a
uhv/vhf Radio with and I used a ft-840 with success for winlink on
HF. ?I ran the RMS express from a Windows PC and connect to the
Rpi/direwolf via tcpip and used the Winmore mode with ease on HF.
?
I had a Bitx40 on a raspberry pi already with wsjtx and can
do ptt with a com port but now that ubitx has CAT control it
makes it even easier. ?
On Feb 24, 2018, at 8:29 PM, KC9SGV < kc9sgv@...>
wrote:
Hi All,
Have a look at VARA.
It is a new Milspec digital mode adjusted for the U.S.
HF (or VHF) ham bands.
Meaning it satisfies all the current FCC legal
requirements for HF digital.
< 300 baud, < 2.4 KHz bandwidth.
52 Carriers in orthogonally spaced subcarriers.
Multiple OS platforms.
Thruput speeds comparable with P3.....
Full Winlink functionality using the Winlink Express
radio email client in Telnet mode.
"VARA is a High Performance HF modem based on OFDM
modulation. VARA Modem, brings state of the art
Military grade technology to new and existing HF data.
Introduces a new standard of technology available for
Amateur and Commercial use. Designed for operation
within a SSB Bandwidth of 2400 Hz."
(Scroll down)
Who would be the first to run VARA on a BitX radio ?
Please post the results (with pictures) here.
?
Bernie,
KC9SGV
?
?
--
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID "MotDog@..."
Mike@...
|
Re: VARA HF digital on BitX
If you want to try another method, I had success with a raspberry pi running Dire Wolf a software TNC and I am able to control a uhv/vhf Radio with and I used a ft-840 with success for winlink on HF. ?I ran the RMS express from a Windows PC and connect to the Rpi/direwolf via tcpip and used the Winmore mode with ease on HF. ?
I had a Bitx40 on a raspberry pi already with wsjtx and can do ptt with a com port but now that ubitx has CAT control it makes it even easier. ?
toggle quoted message
Show quoted text
On Feb 24, 2018, at 8:29 PM, KC9SGV < kc9sgv@...> wrote:
Hi All,
Have a look at VARA.
It is a new Milspec digital mode adjusted for the U.S. HF (or VHF) ham bands.
Meaning it satisfies all the current FCC legal requirements for HF digital.
< 300 baud, < 2.4 KHz bandwidth.
52 Carriers in orthogonally spaced subcarriers.
Multiple OS platforms.
Thruput speeds comparable with P3.....
Full Winlink functionality using the Winlink Express radio email client in Telnet mode.
"VARA is a High Performance HF modem based on OFDM modulation. VARA Modem, brings state of the art Military grade technology to new and existing HF data.
Introduces a new standard of technology available for Amateur and Commercial use. Designed for operation within a SSB Bandwidth of 2400 Hz."
(Scroll down)
Who would be the first to run VARA on a BitX radio ?
Please post the results (with pictures) here.
?
Bernie,
KC9SGV
?
?
|
The uBitx and Bitx40 are built on a quality FR4 fiberglass-epoxy pc board with plated through holes.
Check the mounting holes in the four corners, you can see a metal cylinder fully connecting the top and bottom pads.
That's true of all holes on this board.
No need to solder pins to more than one side of the board.
toggle quoted message
Show quoted text
On Sat, Feb 24, 2018 at 05:28 pm, John wrote:
Mine might have shorted when I plugged the headphones in.?
I did also check the bottom of the board and that looked fine. Guess there is a bus than placed in the board to connect the under and upper copper plane? Otherwise I would think that some solder on the upper side would connect that trace a little better.
|
Hi All,
Have a look at VARA.
It is a new Milspec digital mode adjusted for the U.S. HF (or VHF) ham bands.
Meaning it satisfies all the current FCC legal requirements for HF digital.
< 300 baud, < 2.4 KHz bandwidth.
52 Carriers in orthogonally spaced subcarriers.
Multiple OS platforms.
Thruput speeds comparable with P3.....
Full Winlink functionality using the Winlink Express radio email client in Telnet mode.
"VARA is a High Performance HF modem based on OFDM modulation. VARA Modem, brings state of the art Military grade technology to new and existing HF data.
Introduces a new standard of technology available for Amateur and Commercial use. Designed for operation within a SSB Bandwidth of 2400 Hz."
(Scroll down)
Who would be the first to run VARA on a BitX radio ?
Please post the results (with pictures) here.
?
Bernie,
KC9SGV
?
?
|
Mine might have shorted when I plugged the headphones in.?
I did also check the bottom of the board and that looked fine. Guess there is a bus than placed in the board to connect the under and upper copper plane? Otherwise I would think that some solder on the upper side would connect that trace a little better.
John
|
Glad I saw this. You wouldn¡¯t think you would smoke something by shorting the speaker leads. That can easily be done by plugging in a headphone jack or not having the headphone jack wired correctly the first time. Be careful! ;)?
toggle quoted message
Show quoted text
On Feb 24, 2018, at 7:54 PM, Bill KC5SB < blmerideth@...> wrote: Yep, one of the speaker leads could have been grounded - not sure.? Whatever happened, U1 came out on the short end of the stick.? Note to self - be careful with speaker leads.
Examination of the solder joints on the bottom of the board indicate no problems and quality workmanship.
|
Not clear why this is happening, but:
The TDA2822M is rated for operation with a supply between 1.8v and 15v, which is an amazing range,
and suggests the output drivers are pretty low impedance.
Since we are running it at 12v (or more), which is near the top of its range, a shorted output could indeed be all it takes.
Specs and graphs in the datasheet stop at a 9v supply, it's only the spec for the supply voltage that?
suggests 15v might be ok.??
If you run the TDA2822M output to a stereo headphone jack with both ears getting sound,
then plugging in a mono jack will short the output to ground.?
If you wind up replacing the TDA2822M, you might lift pin 1 and insert a 4 or 8 ohm 1/2 watt resistor in series there as a precaution.
If really paranoid, perhaps add an 8 or 9v linear regulator (or string of diodes) to reduce Vcc into the TDA2822M.
I have no idea how R75 could have smoked, except maybe a catastrophic failure in the TDA2822M?
shorted that (normally) input pin to Vcc somehow.
How many have blown?? ?Maybe 2 or 3?? In all cases, is it possible the output got shorted?
Jerry, KE7ER
toggle quoted message
Show quoted text
On Sat, Feb 24, 2018 at 04:54 pm, Bill KC5SB wrote:
Yep, one of the speaker leads could have been grounded - not sure.? Whatever happened, U1 came out on the short end of the stick.? Note to self - be careful with speaker leads.
Examination of the solder joints on the bottom of the board indicate no problems and quality workmanship.
|
Re: Looking for Completely Functional Dual-Band 20/(17/15/10/6) Meter QRP Rig with SSB/PSK
#bitx20help
its not light but its built like a tank and comes with a water tight case. If you are still interested let me know.     -- David
?N8DAH
|
I'm using a BAOFANG Speaker/Mic.? I understand it follows the Kenwood pin-out 'standard'. Uses a 3.5 plus 2.5mm jacks on the end of the curly cord.
It has an Electret insert and small speaker inside. Seems to work fairly well if the Mic Gain changes are made. (R65 = 4k7, R63 = 10ohms)
Available very cheap on eBay. No internal mods are required.
Beware though, the 3.5mm jack needs to be insulated from the panel if its grounded,? as it's 'live'. I used some plastic to insulate it when fitting the two connectors (on the rear of my case)
glenn
vk3pe
|
Nice to have someone checking this¡ ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ ? Owner - Operator Big Signal Ranch ¨C K9ZC Staunton, Illinois ? Owner ¨C Operator Villa Grand Piton ¨C J68HZ Soufriere, St. Lucia W.I. Rent it: Like us on Facebook! ? Moderator ¨C North American QRO Yahoo Group. ? email:? bill@... ? ?
toggle quoted message
Show quoted text
|
Yep, one of the speaker leads could have been grounded - not sure.? Whatever happened, U1 came out on the short end of the stick.? Note to self - be careful with speaker leads.
Examination of the solder joints on the bottom of the board indicate no problems and quality workmanship.
|
I did then opened the mic to take a peek.? Wow there is a whole circuit board in there with SMD's so small I can hardly see them.? I think I woudl have to supply 5v to the mic or it would not work.? Not sure where to get that so I guess Ill wait for the mics from china.? LOL.? I might look for the 5v later.
--
73, W9KJO
Walter
|
also it appears the diodes in the BOM are marked 2N4148, i would assume they should be 1N 4148?
glenn
|
Look up the wiring pinout on the modular connector?
toggle quoted message
Show quoted text
On Feb 24, 2018, at 4:29 PM, Walter < W9KJO@...> wrote: Great Information
I have a Mic for a TH-9800 by TYT that has a bad modular connector on it.? If it has an electret mic I might be able to change the connector to work with the 8 pin kenwood connector I put in my Ubitx.
How would I know which mic connector is + for an electret mic?
--
73, W9KJO
Walter
|
Looks like the left and right sides have gotten chopped off!
|
Great Information
I have a Mic for a TH-9800 by TYT that has a bad modular connector on it.? If it has an electret mic I might be able to change the connector to work with the 8 pin kenwood connector I put in my Ubitx.
How would I know which mic connector is + for an electret mic?
--
73, W9KJO
Walter
|
Sunil Lakhani
N8DAH
K9HZ