Date   
Re: Low Mic Gain, was, show your mic

Jerry Gaffke
 

Twiddling the bias pots is dangerous, can easily blow the IRF510's.
The bias pots get set at the factory for around 100ma of drain current
as described in the tuneup section on hfsignals.com.
Output will become more non-linear as those bias pots get turned down,
and quiescent transmit power consumption goes up as they get turned up. 
Not much of an effect on power out.  I suggest you not mess with them.

The drive pot at RV1 on the uBitx does directly affect power out,
also the resistor in the mike amp that Raj pointed out for you.

Be aware that too much drive to the final will splatter all over the band.

Jerry


On Sun, Apr 22, 2018 at 10:15 am, Skip Davis wrote:
Max your uBITX has three trim pots on it. Two are blue square unit labeled RV2 and RV3 these are together on the board and adjust the bias to the finals. The third one is RV1 which adjusts the drive level. There are instructions in the the file section on the group site to adjust the bias pots which may help improve your ssb output if yours isn’t set high enough.
Try searching the archives to learn about it and the pitfalls you might encounter.
 

Re: BITX QSO Afternoon/Evening, Sunday, April 22, 3PM & 7PM Local Time, 7277 kHz in North America, 7177 kHz elsewhere.

John P
 

On Fri, Apr 20, 2018 at 06:04 am, John 2e0eii wrote:
I would love to compete but I don't think UK stations ,can tx over 7.200. rgds John 2e0eii
Those of you who can't use 7277 use 7177 and it's not a contest, just a friendly get-together of BitX operators!
 
--
John - WA2FZW

Re: BITX QSO Afternoon/Evening, Sunday, April 22, 3PM & 7PM Local Time, 7277 kHz in North America, 7177 kHz elsewhere.

Matthew S <Rigamurow@...>
 

I will be listening, but cannot transmit due to no license.  Will post to this forum if I hear anything.


On Sun, Apr 22, 2018 at 2:54 PM John P <j.m.price@...> wrote:
On Fri, Apr 20, 2018 at 06:04 am, John 2e0eii wrote:
I would love to compete but I don't think UK stations ,can tx over 7.200. rgds John 2e0eii
Those of you who can't use 7277 use 7177 and it's not a contest, just a friendly get-together of BitX operators!
 
--
John - WA2FZW

Re: Low mic gain, was, show your mic

MVS Sarma
 

if i recollect , a reverse polarity was also responding for voice but verey very lowand distorted.

Regards
MVS Sarma
 

On Sun, Apr 22, 2018 at 10:15 PM, MAX <max@...> wrote:

Hi sarma.

 

I’m sure I have the polarity correct.  Someone on this list posted a drawing showing how to identify the negative terminal and I wired according to it.  I think the electret mic wouldn’t work at all if polarity were reversed.  What is being powered is an  F E T source follower.   I think I shouldn’t have to raise my voice to get 5 watts output on 40 meters.

 

Regards.

 

Max K 4 O D S.

 

I've Never Lost the Wonder.

 

Antique Electronics Site: http://www.angelfire.com/electronic/funwithtubes/

 

 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Mvs Sarma
Sent: Sunday, April 22, 2018 3:44 AM
To: BITX20@groups.io
Subject: Re: [BITX20] show your mic

 

Max,

 please check whether the mic body is connected to chasis ground.

i mean the positive bias voltage for mic should come on independent pin and NOT to the body pin of the eletret element.

In case you are using a dynamic mic, perhaps we need more gain and your need to shout appers logical.

regards

sarma

vu3zmv


Regards
MVS Sarma
 

 

On Sat, Apr 21, 2018 at 11:27 PM, MAX <max@...> wrote:

Speaking of mics, I have to raise my voice almost to the level of shouting to get 5 watts out on 40 meters.  Is this normal or should I look for a problem?

 

Regards.

 

Max K 4 O D S.

 

I've Never Lost the Wonder.

 

Antique Electronics Site: http://www.angelfire.com/electronic/funwithtubes/

 

 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Mvs Sarma
Sent: Saturday, April 21, 2018 7:17 AM
To: BITX20@groups.io
Subject: Re: [BITX20] show your mic

 

I had grabed a taperecorder mic with 3.5mm mono pin.
 replaced the cable with 2+shield.had a small pushed switchmounted and wired.
 repalced the 3.5mm momo pin to stereo pin. Here is a image of my mic.The pp9 battery helps to imagine the mic size.
regards
 sarma
 vu3zmv

 


Re: Ubitx.net site correction #ubitx-help #ubitx

Mike Woods
 

W7PEA

Thanks for pointing this problem out.  It has now been corrected.  A number of these ‘syntheses’ need updating as new and better mods or fixes have been contributed by the community of experimenters.

Mike ZL1AXG uBITx.net


On Mon, 23 Apr 2018 at 5:25 AM, W7PEA <patrick@...> wrote:
The ubitx.net site says the wiring diagram for the volume control is incorrect. Its it now correct.

http://ubitx.net/wiring-up-the-volume-control/
^^ that page should be pulled or updated to reflect that change.

A wiki would be a great idea for the community so we can maintain the information together.
-W7PEA

Re: BITX QSO Afternoon/Evening, Sunday, April 22, 3PM & 7PM Local Time, 7277 kHz in North America, 7177 kHz elsewhere.

John P
 

Not hearing anything but noise. Not even anything on FT-8 this afternoon! I'll be on again this evening.
--
John - WA2FZW

Re: Teensy 3.5/3.6 upgrade for uBITX

Jim Sheldon
 

Phil (and others) - that adapter board I mentioned is a prototype only and was never intended for sale.  Therefore,I am not at liberty to sell even one of the very few on hand within our group and they will not be available for purchase, sorry. 

Jim Sheldon - W0EB

Re: Erratic tuning with my new uBitx

Ian Lee
 

Chris.
You have given the opportunity to add another great feature for uBITX Users.
Thank you.

I do not know about your External Filter. But I know that you are doing a great job to improve your uBITX.
If you have a spare time, please introduce your External Filter. I want to make it.
I do not have much experience with such things, so I do not know if it will be the right answer.

I think there are three ways you can solve your problem.
1.Adjust the Master Calibration.
  If you use uBITX Manager, do not worry.
  Before making any adjustments, uBITX Manager can back up your uBITX information to a file.
  If you have a backup file, your uBITX can be restored at any time.

  I think you can lower your Master Calibration value a little.
  If you let me know the reference frequency (EX: 7.02Mhz, 14.03Mhz ...) you used to measure in the frequency counter, I will give you a calculation.
  If you send me your uBITX backup file, I can look into it more closely.

I'll skip it, Because you measured the 150hz error clearly through the instrument.
2.Adjust BFO
3.using split 

 Also, if you prefer to modify the code rather than the calibration setting, add 'calibration = calibration - 00000' to the end of the initSettings () function.
 Instead of 0000, try increasing the value in small increments.

Ian KD8CEC

2018-04-23 1:29 GMT+09:00 Chris Clarke <csclarke@...>:

Hi Ian

I'm compiling, uploading and running v1.070 and I still have one  issue.

I suspect I must have a calibration problem, because in order to achieve a 600Hz CW TX off-set (to match my external 600Hz AF filter) I have had to hard code the call in <ubitx_20>  at line 647

si5351bx_setfreq(2, frequency - sidetone + 150) ;

I have checked the TX frequency with a my frequency counter and it is definitely off-set from RX by nearly 800Hz when <sideTone=600>, and is correctly offset with my addition of 150.

If I just change the value of the variable <sidetone = 450>, the TX offset is then correct but the audio tone frequency is way too low for comfortable listening on RX.

With <sidetone = 600> the audio sounds perfect, however the extra 150Hz TX offset applied by the call <si5351bx_setfreq(2, 600)> takes the received signal outside the passband of my external AF filter.

Can I change/calibrate one of the program parameters/variables to achieve the same end?

I am wary of doing anything via the calibration menu without being sure of not doing something irretrievable. Eg calibrating BFO could have implications I am unaware of, as this is not the simple BFO of which I am familiar from my 1960s analogue receiver days!

The problem was the same with earlier firmware versions (eg v1.061) so am I correct to assume that this is a hardware issue requiring calibration in some form?

Chris



--
Best 73
KD8CEC / Ph.D ian lee
kd8cec@...
www.hamskey.com (my blog)

Re: KD8CEC 1.072 download

Ian Lee
 

Rod, All

I am always thanking Rod.
And I'm sorry to interrupt Rod's work with too many changes in functionality.

1.072 will be tested and will be released as 1.073 Beta.
Several minor ones have been added.
Please wait for a day or two to download the code or firmware. 

Perhaps 1.07x will continue to be a Beta version.
Frequent formal firmware release seems to be inconvenient for some people, so I try to release it after various tests.

I think Version 1.061 is a stable version. I know there is some nice firmware based on Version 1.061 and I will install it on my Spare uBITX.
Version 1.061 and later versions are also based on Version 1.061.
The Portable version and the various language versions are all excellent Firmware and I share code with them.

Please wait for a day or two , I'll release version 1.073 beta after testing in various environments (including Linux).

Thank you

Ian KD8CEC

2018-04-22 7:25 GMT+09:00 Rod Davis <km6sn@...>:

Hi All,

Ron, W7HD, points out that downloading the KD8CEC 1.072 can be a problem

because version 1.072 does not appear in the list.


It is necessary to click on the Branch button, then use your mouse wheel to

scroll down until the version1.072 is revealed.


Best to All,

Rod KM6SN



See below for an excerpt:

Download the CECFW source code from github

https://github.com/phdlee/ubitx

For this example we will be using version 1.072.



Click the “Branch” button to select version 1.072, then click “Clone or download” and click “Download ZIP”. Unzip the downloaded file and make a note of the folder location, or move the unzipped directory into your arduino sketch folder.




--
Best 73
KD8CEC / Ph.D ian lee
kd8cec@...
www.hamskey.com (my blog)

Finally made some SSB contacts! #ubitx

Daniel Conklin
 

I took my time getting the radio to the stage where I felt comfortable using it.  I took apart a non-functioning $2.00 Chinese Baofeng mic and replaced the guts withe the HFsignals provided mic capsule and switch.  Yesterday I made contact with the Cape Cod Marconi's Birthday Event station, KM1CC and they gave me a 59 on 40 meters! Then I made contact with three stations in South Bend, IN and in Michigan.
Dan, W2DLC

Re: Finally made some SSB contacts! #ubitx

Bill Meara
 

Good going Dan!  Congratulations. 73  Bill N2CQR

On Sunday, April 22, 2018, 5:05:36 PM EDT, Daniel Conklin <danconklin2@...> wrote:


I took my time getting the radio to the stage where I felt comfortable using it.  I took apart a non-functioning $2.00 Chinese Baofeng mic and replaced the guts withe the HFsignals provided mic capsule and switch.  Yesterday I made contact with the Cape Cod Marconi's Birthday Event station, KM1CC and they gave me a 59 on 40 meters! Then I made contact with three stations in South Bend, IN and in Michigan.
Dan, W2DLC

Re: Finally made some SSB contacts! #ubitx

Skip Davis
 

Very good Dan great catch on forty. I’ll be trying to get mine on tonight.

Skip Davis, NC9O 

On Apr 22, 2018, at 17:14, Bill Meara via Groups.Io <n2cqr@...> wrote:

Good going Dan!  Congratulations. 73  Bill N2CQR

On Sunday, April 22, 2018, 5:05:36 PM EDT, Daniel Conklin <danconklin2@...> wrote:


I took my time getting the radio to the stage where I felt comfortable using it.  I took apart a non-functioning $2.00 Chinese Baofeng mic and replaced the guts withe the HFsignals provided mic capsule and switch.  Yesterday I made contact with the Cape Cod Marconi's Birthday Event station, KM1CC and they gave me a 59 on 40 meters! Then I made contact with three stations in South Bend, IN and in Michigan.
Dan, W2DLC

Re: Finally made some SSB contacts! #ubitx

_Dave_ K0MBT
 

I got one of the other Marconi stations w1aa. Had a nice talk with whitey

I usually get a lot of qsos in Michigan
Dave
K0MBT
Missouri

Re: show your mic

Gary Anderson
 

In the spirit of fun, here's mine.  I can honestly say, I've never seen one like it. Made from three discarded Copenhagen cans, a junk box metric-pitch tactile switch, the supplied mic, a TRS socket, a thin piece of open cell foam in front of the mic, a thick piece of close cell foam surrounding and behind the mic, and one pop rivet to hold the PTT lever.  The mic is mounted on a circular plastic disk slightly smaller the the ID of the can which was cut from the third can and drilled to locate the mic. The PTT lever (cut with aviation snips)  works surprisingly well, and the mic is comfortable in the hand.  The socket allows the cord to be swapped out and possibly a stand in the future, where the mic can be held by a male plug. As far as sound quality, don't know yet.

Re: Help with wiring the audio, mic, and key jacks

Michael Shreeve
 

The thing in the instructions that many people miss is the last instruction which says push PTT to store and complete.  I  didn't see that at first.  


On Sun, Apr 22, 2018, 6:21 AM VU3WMJ@... Virtualview <vu3wmj@...> wrote:
How to store bfo and vfo frequency on ver 2.. help plse...... 

On Sat, Feb 10, 2018, 5:53 AM Michael Hagen <motdog@...> wrote:



On 2/9/2018 2:31 PM, Mike Lichtman via Groups.Io wrote:
I am confused wiring to the jacks. The standard jack terminal no.s do not seem to apply to the wiring pictorial.
Do I go by the jack terminal no.s or the way the wires are connected in the pictures? With the terminal side up and the plug
opening to the left, my reference says the terminal no.s are:     1 -terminal closest to opening, 2 single middle upper terminal, 3 back upper terminal,4 lower back terminal, 5 mid inside just next to 4. From the wiring pictorial it does make sense. Thank you in advance. 73 Mike KF6KXG

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

Re: Low mic gain, was, show your mic

_Dave_ K0MBT
 

My bitx40 really improved when I put a replacement mic in it. One day I was not getting any signal out of the transmitter. Tracked it back to the mic which was dead. Originally it worked for a month. The replacement seems stronger. 

Re: Erratic tuning with my new uBitx

Nikos SV1IYF
 

Hi Chris,

It surely sounds like a frequency calibration problem, but it is also uncertain as to which piece of equipment contributes more to the error, i.e. the μBITX or your frequency counter,.
Unless your frequency counter has a high precision reference like a GPS disciplined time base, or at least, a TCXO of recent vintage (crystals age), my suspicions would fall on them both.

What I would do:

1) Use the calibration tool of WSJT-x to check my μBITX against a frequency/time standard station at the highest frequency I could get a clean signal from (14.996 MHz here from the Russian station). Note down the offset.

2) Do the same as in 1), but this time using my other rig in TX mode as a frequency generator and adjusting the dial frequency as to get the same offset as in 1).

3) The scope of  step 2) is to establish a local frequency source of suitable power to be measured by the frequency counter, thing to be done here.

4) By now I would have 3 numbers:

a) The dial frequency of μBITX

b) The offset of WSJT-x calibration tool

c) The indication of the frequency counter

Enough information to allocate both (?) frequency offsets.

 

73 Nikos SV1IYF


Re: BITX QSO Afternoon/Evening, Sunday, April 22, 3PM & 7PM Local Time, 7277 kHz in North America, 7177 kHz elsewhere.

John P
 

Hearing someone on 7277, but can't make out a call. Lots of QRN here tonight.
--
John - WA2FZW

Rectifier fuse crowbar. #ubitx

Lee
 

I am using 2 fuses. One for the output transistors and one for everything else.  I was thinking of using one 6 amp rectifier that points in the direction of the power switch and then a wire from the power switch back to power each fuse.  It won't crowbar the fuse with wrong polarity but just stop current flow.  Voltage drop should be around .5 to .7 volts.  I could always parallel 2 of them to cut the voltage drop to 1/2.  What do you think?

Re: BITX QSO Afternoon/Evening, Sunday, April 22, 3PM & 7PM Local Time, 7277 kHz in North America, 7177 kHz elsewhere.

Matthew S <Rigamurow@...>
 

Hearing someone call sign ending in THR.  Also hear a NE Missouri station from here in WV.


On Sun, Apr 22, 2018 at 7:08 PM John P <j.m.price@...> wrote:
Hearing someone on 7277, but can't make out a call. Lots of QRN here tonight.
--
John - WA2FZW