Date   
ssm2167 board for compression #ubitx #ssm2167

n8yg
 

I've been reading the topics regarding the ssm2167 with much interest.  So finally I integrated the board into my ubitx v5. I ended up with a trimmer on the output of the board, and pots on the compression, and noise gates.   The problem I ran into is that on the air, rotating the 100K pot I had for compression had little to no effect, but I was getting compression as it was clearly audible on the air. 

I read the data sheet more thoroughly on the ssm2167 and found that the input voltage has to be quite low. -20 to -30 dBV or so.. measuring the electret microphone output on the scope, yielded much higher.. aha..I thought.. I need yet another pot to trim the input voltage. I still needed the 5V to get to the electret so I wanted the trimmer past the 0.1 uF on the board..:-(  so I took of the 0.1 uf cap off the board, and made connections for the trimmer post 0.1 uF cap. So now 3 pots and one trimmer. Trimmer adjusts the output voltage, pots are input voltage to the board, compression and noise gate.   On the air..no compression sounds like no compression.. and turning up the pot makes now a profound difference in on the air sound with a LOT of punch. the Power meter goes way up with compression now. What I believe was happening is that the input was so high that I was in the limiting portion of the transfer curve for the ssm2167, and now I'm back in the linear portion, and all is well!  My problem is that it would really be good to have the trimmers on a board, so maybe I'll design a board to accommodate the changes. 
73
Brad N8YG

Re: another stuck relay in TX mode #ubitx #bitx20

Don - KM4UDX
 

Curt -- I can reflow each pin if I pull up my pants and stop being a whousssssss.

Good implyed question on the drive level. SWR meter says 28w on wspr on 80m, which means two full minutes of hard duty.  But I don't know what band it was on when it locks up.   I was so freeked about how it could be in drive when there was no TX command from my computer, a disconnected sound card, a reboot, a physical turn off/on, that I didn't notice what the band or pwr level was. I feel silly now not noticing that. 

I'll look for any anomolies on the board.  The "case" has a lot of air flow, so something could have landed where it wasn't supposed to be. 

The lock up is seemingly random, so I can't make it misbehave on command (yet).  If it keeps up, I'm sure that even I will figure out the pattern. hahah.  This is the third time so far. 

If i decide to replace it, I assume the required relay is the axicom  V23105A5403A201 discused (endlessly) in previous threads?

Given that I may need only one, there must be some uBITX builder who got 5 or 10 and would send me 1 or 2 (pleaseeeee..)?

Don
km4udx

Re: Calibration success #ubitx #calibration

Dean Souleles
 

Success.  The problem turned out to be a short between the mic audio line and ground.  Sunil from amateurradiokits.in had sent me a second front panel PCB after I reported my initial problem to him. (His customer services has been awesome and very responsive.)

I could not figure out where the short was - so I wired up a the new PCB - using a smaller iron tip and smaller gauge solder.  No short this time.  I can report that the Uniden/Cobra mic with the 4 pin connector works fine - completely unmodified.   

Here is a video of the completed rig receiving (sans the send/receive LED which I still have to wire up)

https://photos.app.goo.gl/78sKsTqsvm63NzE7A

Thanks everyone for the help and advice.  

Dean
KK4DAS

Re: Narrow filter for CW #ubitxcw

MadRadioModder
 

Stand alone just like you see in the picture.  Uses the Audio Adapter/ Shield board from prjc.com, a Teensy 3.6, a small SPI 7735 display, two encoders, and two LEDs.  That’s it.  Custom code.  Not published yet.

 

 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Tom, wb6b
Sent: Wednesday, August 14, 2019 6:37 PM
To: BITX20@groups.io
Subject: Re: [BITX20] Narrow filter for CW #ubitxcw

 

On Tue, Aug 13, 2019 at 07:42 AM, MadRadioModder wrote:

I use my own coded version of this thing

That looks like a cool implementation. Is your audio bandpass filter stand alone or is it an add-on to the Sotabeams filter board?

It sounds like it is a stand alone DSP filter and display.

Is the code on GitHub or somewhere?

Tom, wb6b


Virus-free. www.avg.com

--

…_. _._

Re: Narrow filter for CW #ubitxcw

MadRadioModder
 

The sotabeams filters are exceedingly good technically.  It’s the flexibility and user interface that’s stinks.  And, of course, it can’t be modified, even though the processor has plenty of resource for additional computational things like a nice display to graphically show you the filter contour.

 

 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of David Posthuma
Sent: Wednesday, August 14, 2019 7:33 PM
To: bitx20@groups.io; bitx20@groups.io
Subject: Re: [BITX20] Narrow filter for CW #ubitxcw

 

The sofa beams Audio DPS boards...there are several models...are stand alone boards, no coach needed. Simply insert in your audio chain and add power. It works great. Far better than I had hoped. They are worth the investment.

 

David Posthuma

WD8PUO

 

 


From: bitx20@groups.io on behalf of Tom, wb6b <wb6b@...>
Sent: Wednesday, August 14, 2019 7:37 PM
To: bitx20@groups.io
Subject: Re: [BITX20] Narrow filter for CW #ubitxcw

 

On Tue, Aug 13, 2019 at 07:42 AM, MadRadioModder wrote:

I use my own coded version of this thing

That looks like a cool implementation. Is your audio bandpass filter stand alone or is it an add-on to the Sotabeams filter board?

It sounds like it is a stand alone DSP filter and display.

Is the code on GitHub or somewhere?

Tom, wb6b


Virus-free. www.avg.com

--

…_. _._

Re: Antuino support group opened -- early antuino question

kh6sky
 

I don't think anyone has mentioned the nanoVNA.  These go from 50 kHz up to 900 MHz, color touch screen, built with rechargable battery and PC sw.  They cost less than 70 USD.  Look at https://groups.io/g/nanovna-users/

It is strong competition I am afraid for the antuino,  Though I will probably still get an antuino because it will no doubt be the learning and experimentation platform that the BitX radios have become.

Stuck relay

KB2HSH
 

I have a V3 uBITX that was stuck in TX last night...until I opened the rig up and tapped on the relays to "correct" the problem temporarily. Does anyone know which relay is to blame, and what the replacement is for it? Until this, it had been perfect for more than a year and a half. 



John KB2HSH 

Re: Stuck relay

Gordon Gibby
 

Those relays are only rated for two amps @ a not very high voltage; Contacts will eventually wear out on any relay.  

You can probably find a slightly beefier relay, use it instead, and add a transistor buffer for the relay coil current if required


On Aug 15, 2019, at 05:30, KB2HSH <john.marranca@...> wrote:

I have a V3 uBITX that was stuck in TX last night...until I opened the rig up and tapped on the relays to "correct" the problem temporarily. Does anyone know which relay is to blame, and what the replacement is for it? Until this, it had been perfect for more than a year and a half. 



John KB2HSH 

Re: Narrow filter for CW #ubitxcw

Dennis Zabawa
 

Go here for schematic and Arduino sketch: Filter

Re: Calibration success #ubitx #calibration

kc0wox Leeper
 

I'm glad you found the answer. I looked at the schematic trying to make a suggestion on what to check but I have no experience with the ubitx. There has been quite a few Cobra mikes used over the last 10 years or so. http://golddredgervideo.com/kc0wox/cobramike.htm The main thing to watch is not to overdrive the bitx mike input.
Leonard

Re: another stuck relay in TX mode #ubitx #bitx20

Sam Tedesco
 

I have a bunch. I can mail you a couple.

Re: another stuck relay in TX mode #ubitx #bitx20

Curt
 

Don

28 watts on 80m?  most of us are around 10 watts - could be an inaccurate power meter - or if you really are doing 20-some watts you could be over-driving badly. 

notice I am suspicious that relay itself may be still okay ....

you might have some RF getting into raduino that is locking it on transmit.  at the same time, its not wise to make this much RF with the ubitx - you could be jamming all kinds of fellow hams - for not much benefit on FT8.  if it does not lock up when doing SSB voice - another clue it may merely be too much drive into the PA. 

much better to solve it with an adjustment than to take the ubitx into unnecessary surgery! 

Curt

Re: Narrow filter for CW #ubitxcw

Richard Spohn
 

I believe this is where the Wolfwave comes in. It is a complete
enclosure and GUI with the sotabeams DSP board at its core. A tad
pricey but it does everything - including regenerating clean CW from a
less-than-ideal signal. I fould it rather intriquing. - Rich WB2GXM

On 8/14/19, MadRadioModder <@MadRadioModder> wrote:
The sotabeams filters are exceedingly good technically. It's the
flexibility and user interface that's stinks. And, of course, it can't be
modified, even though the processor has plenty of resource for additional
computational things like a nice display to graphically show you the filter
contour.





From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of David
Posthuma
Sent: Wednesday, August 14, 2019 7:33 PM
To: bitx20@groups.io; bitx20@groups.io
Subject: Re: [BITX20] Narrow filter for CW #ubitxcw



The sofa beams Audio DPS boards...there are several models...are stand
alone
boards, no coach needed. Simply insert in your audio chain and add power.
It
works great. Far better than I had hoped. They are worth the investment.



David Posthuma

WD8PUO



Get Outlook for iOS <https://aka.ms/o0ukef>



_____

From: bitx20@groups.io <mailto:bitx20@groups.io> on behalf of Tom, wb6b
<wb6b@... <mailto:wb6b@...> >
Sent: Wednesday, August 14, 2019 7:37 PM
To: bitx20@groups.io <mailto:bitx20@groups.io>
Subject: Re: [BITX20] Narrow filter for CW #ubitxcw



On Tue, Aug 13, 2019 at 07:42 AM, MadRadioModder wrote:

I use my own coded version of this thing

That looks like a cool implementation. Is your audio bandpass filter stand
alone or is it an add-on to the Sotabeams filter board?

It sounds like it is a stand alone DSP filter and display.

Is the code on GitHub or somewhere?

Tom, wb6b





---
This email has been checked for viruses by AVG.
https://www.avg.com



Re: Narrow filter for CW #ubitxcw

MadRadioModder
 

WOW! that Wolfwave filter cost upwards of $300 USD!!! My digital filter does everything it does and more (including a color display)... and was less than $50...

-----Original Message-----
From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Richard Spohn
Sent: Thursday, August 15, 2019 1:56 PM
To: BITX20@groups.io
Subject: Re: [BITX20] Narrow filter for CW #ubitxcw

I believe this is where the Wolfwave comes in. It is a complete enclosure and GUI with the sotabeams DSP board at its core. A tad pricey but it does everything - including regenerating clean CW from a less-than-ideal signal. I fould it rather intriquing. - Rich WB2GXM

On 8/14/19, MadRadioModder <@MadRadioModder> wrote:
The sotabeams filters are exceedingly good technically. It's the
flexibility and user interface that's stinks. And, of course, it
can't be modified, even though the processor has plenty of resource
for additional computational things like a nice display to graphically
show you the filter contour.





From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of David
Posthuma
Sent: Wednesday, August 14, 2019 7:33 PM
To: bitx20@groups.io; bitx20@groups.io
Subject: Re: [BITX20] Narrow filter for CW #ubitxcw



The sofa beams Audio DPS boards...there are several models...are stand
alone boards, no coach needed. Simply insert in your audio chain and
add power.
It
works great. Far better than I had hoped. They are worth the investment.



David Posthuma

WD8PUO



Get Outlook for iOS <https://aka.ms/o0ukef>



_____

From: bitx20@groups.io <mailto:bitx20@groups.io> on behalf of Tom,
wb6b <wb6b@... <mailto:wb6b@...> >
Sent: Wednesday, August 14, 2019 7:37 PM
To: bitx20@groups.io <mailto:bitx20@groups.io>
Subject: Re: [BITX20] Narrow filter for CW #ubitxcw



On Tue, Aug 13, 2019 at 07:42 AM, MadRadioModder wrote:

I use my own coded version of this thing

That looks like a cool implementation. Is your audio bandpass filter
stand alone or is it an add-on to the Sotabeams filter board?

It sounds like it is a stand alone DSP filter and display.

Is the code on GitHub or somewhere?

Tom, wb6b





---
This email has been checked for viruses by AVG.
https://www.avg.com








--
…_. _._

Re: another stuck relay in TX mode #ubitx #bitx20

John Faivre
 

I had the same issue. I replaced K1 with the axicom and it fixed it.i only run about 15 watts on 80 meters, but I was switching inductance on my ant tuner often while in transmit. I think that may have contributed to the proble, 
--
John Faivre WA9SGD

Re: Stuck relay

John Faivre
 

K1 is the Transmitt/Recieve relay. It was sticking in my v4
--
John Faivre WA9SGD

Re: Antuino support group opened -- early antuino question

Gerry Kavanagh
 

Different use case, IMO. I have a NanoVNA, and it's great for measuring passive devices' S11 & S21 parameters, but for signal measurement (spectral purity, power level) it is useless. This is why I ordered the Antuino.
/ Gerry

Re: V5.1 and Nextion 5”

Murray Wills (ZL2IQ)
 

Image
Image
Hi everyone

Installed a separate PS and updated the display software. Very pleased with the results.

I also have a higher output regulator coming so the step down PS is only temporary. That board will be useful for other projects.

Thanks for all the help

73. Murray ZL2IQ




On Tue, Aug 6, 2019 at 11:11 AM +1200, "David Posthuma" <davep@...> wrote:

I used a 4.3-inch Nextion screen with no problems.

David Posthuma
WD8PUO

 

From: bitx20@groups.io on behalf of Murray Wills (ZL2IQ) <murray@...>
Sent: Monday, August 5, 2019 6:27 PM
To: bitx20@groups.io
Subject: Re: [BITX20] V5.1 and Nextion 5”
 

Thank you Evan for the time you have taken to help me out.

73 Murray ZL2IQ

 

From: BITX20@groups.io <BITX20@groups.io> On Behalf Of Evan Hand
Sent: Monday, 5 August 2019 11:11 PM
To: BITX20@groups.io
Subject: Re: [BITX20] V5.1 and Nextion 5”

 

Murray,

What Mike is saying is that the 5" screen may be too much for the 7805 5 volt regulator in the Raduino that comes with the uBitx.  There are a number of options, everything from modifying the Raduino regulator circuit, to simply adding another 7805 5 volt dc regulator. 

Background:
The 13.8 volt power supply is much more than the uBitx needs.  The 13.8 volts is good for the finals, however the rest of the board prefers the specified 12 volts.  That is why there are two power connections on the uBitx board.  The 7805 5 volt regulator on the Raduino runs off of the uBitx board supply, not the finals supply.  As currently connected it needs to drop that 13.8 volts to 5 volts.  The difference is dissipated as heat by the regulator.  The amount of heat  depends on the current draw through it. The recommended power supply for the display by Nextion is 5 volts at 1 amp.  Much more than the stock Raduino setup can provide.  

Here is the Nextion spec sheet:
https://nextion.itead.cc/datasheets/nx8048k050/ 

Suggestion:
Based on the current requirements I would suggest that you add another, separate 5 volt power for the Nextion display. This can be based on a 7806 type of regulator like one that is in the Raduino, however it will need a dropping resistor, heat sink, and the appropriate filter capacitors to work.  Another option is to by an assembled 12 volt to 5 volt reducer.  The watch out here is that it could generate noise as most are pulsed based circuits.

Here is an example datasheet for the 7805.
  https://www.sparkfun.com/datasheets/Components/LM7805.pdf

See figure 1 on page 7.  It gives typical input and output capacitor values, though does not cover a dropping resistor. 

Since the input is relatively high compared to the minimum required, and the power dissipation is dependent on the voltage drop times the current (nominal 13.8 - 5 = 8.8 volts times the max current of 1 amp = 8.8 watts).  Much higher than the design dissipation even with a heat sink.  Adding a voltage dropping resistor to get the dissipation lower is suggested.  The minimum specified input voltage is 7 volts.  I would use 8 volts to account for any variations in the input supply.  That means we need to drop the 13.8 volts to 8 volts with a resistor at the current draw of the specified 1 amp.  For this I would use a 4 or 5 ohm power resistor rated for 4 or 5 watts respectively.  Since this is the DC part of the radio, wire wound works well. The actual value of resistor would be 5.8 ohms and 6 watts.  You can go lower in value, just means more heat to be dissipated by the regulator, but do not go higher as at some point the input voltage may drop below minimum.

You will need to add a heat sink on the regulator.  This can be the case if it is aluminum, and you install the appropriate insulators for the mounting.  I would go with a separate heat sink similar to the one on the finals.

Another suggestion is to put a voltage drop between the 13.8 volt supply and the uBitx board.  This involves separating the red and brown power supply wires (per the supplied connector).   To that end I would recommend adding 2 4n4000 series diodes to drop the 13.8 volts to 12 volts to the RED wire.  4n4000 series diodes are rated for only 1 amp, so you will need to separate the finals supply and connect it directly to the 13.8 volt source.  If you do this modification as well, will need to go back and recalculate the voltage and resistor values for the Nextion display above.  I am using a 4 ohm 4 watt resistor in my setup, with the diodes to drop the voltage to the main uBitx board.

Please take the above with a grain of salt.  There may be errors, so verify.

Good luck with the build.

73
Evan
AC9TU

Re: another stuck relay in TX mode #ubitx #bitx20

Peter LB0K
 

A stuck relay that releases on being tapped usually indicates that (some of) the contacts themselves are sticking together, presumably from arcing.

The only real cure with these small sealed units is to replace with a maybe beefier alternative, and in the longer term try and check whether the relay is in fact being commanded to open before the transmission has ended completely. Or maybe the transmission is starting some milliseconds before the relay contacts close properly.
For serious VHF/UHF work this what sequencers for the antenne and power switching arrangements are for, to make sure that the antenna changeovers are made before the signal starts, or after it ends. Thus ensuring the relays, and PA units, aren't subjected to unnecessary stresses.

For testing, one can make continuity checks across the contacts while is in the 'stuck' state to be certain of the diagnosis. But very often any slight movement or vibration will cause the relay contacts to release.

Of cause there could be a dry joint somewhere so reflowing all joints to the relay and its driver is an important first step. And see if the sticking still occurs at lower levels of, say, 10W.

73 Peter. 

Re: Narrow filter for CW #ubitxcw

_Dave_ K0MBT
 

Yes I was hoping to steal someones design and spend less than 10 dollars.

Have to agree that adding a 300 dollar filter to a radio that I bought used for 45 dollars is not going to happen.