Re: uBITX microphone suggestions

Joe Puma

开云体育

I did that too. Plus I added a amp/compressor board. My audio level are hitting nicely now ???

Joe

On Oct 19, 2018, at 4:41 AM, iz oos <and2oosiz2@...> wrote:

11v seem a lot. To have a reasonable average power in SSB I followed the advice by Howard Fidel in my vers. 3 ubitx: ' Change R63 to 24 ohms. The earlier rev boards had 100 ohms there, and V3 has 47. I put another 47 ohm resistor in parallel with the one on the board.'

Il 19/ott/2018 10:31, <laurent.bury@...> ha scritto:
Hello Ian,

may be you could try this speech process circuit if you haven't seen it yet:
(look at the bottom of the page)

I hope to find some time to test it in the future, looks nice :)

73

--
Laurent F5FIE.

Re: Simple spur fix

#60841

Nice, and continue to share your experience as you advance.

all the best

regards

sarma

?vu3zmv

Show quoted text

On Fri, Oct 19, 2018 at 7:19 PM Warren Allgyer <allgyer@...> wrote:

Back online after 3 weeks in Mongolia........

ERA-3SM+ MMICs arrived while I was gone. 10 pieces for $7.78 including shipping from China on eBay. I strongly suspected counterfeit goods but initial tests would indicate otherwise. Put in place on this board, I am showing +22 dB gain flat within 0.2 dB from 300 KHz to 200 MHz drawing 40 ma at 4.5 volts Vcc. Looks like a perfect gain block for the bi-directional amps. Later today will be checking IMD performance at various output levels.

Not bad for 80 cents!

?

WA8TOD (recently JT1TD and BG1TOD)

Re: Simple spur fix

Warren Allgyer

#60840

Back online after 3 weeks in Mongolia........

ERA-3SM+ MMICs arrived while I was gone. 10 pieces for $7.78 including shipping from China on eBay. I strongly suspected counterfeit goods but initial tests would indicate otherwise. Put in place on this board, I am showing +22 dB gain flat within 0.2 dB from 300 KHz to 200 MHz drawing 40 ma at 4.5 volts Vcc. Looks like a perfect gain block for the bi-directional amps. Later today will be checking IMD performance at various output levels.

Not bad for 80 cents!

?

WA8TOD (recently JT1TD and BG1TOD)

Re: uBITX Encoder PPR ??

#60839

With Jack’s and others help in resolving encoding issues on Raduino, I have learned that the KT-040 World great. Most encoders will work, if your Nano is without issue. I have tried several different ones and all seem to work reasonably well.
--
72 and God bless
KD4EPG

Re: uBITX microphone suggestions

#60838

?If you can get microphones made for the G.E. Delta and Rangr series, they come with a preamp built in.

?Just wire the connector of your choice onto the cable.

?I bought a batch of mikes for those models, plus the mastr II and the Phoenix models.

?Checking, I find that at least the? Delta and rangr have the preamp, and one or two for the phoenix also do. Though the data for the Phoenix shows an Electret mike.

?But, these will work fine with the BITX series. Just be sure to adjust the mike gain so you don't overdrive the radio.

?Also, some CB mikes that came with a preamp should also work well.

?Some of those came with a speech processor, I think.

?been a while since I looked at those.

?I normally did not need anything besides the stock mikes.

?Wayne WA2YNE

Re: uBITX microphone suggestions

Art Boelke

#60837

If you do not like working on the V3 board you could add up toa 2.2k
dropping resistor in the mic in series with + voltage line to electret
element. As to low audio a little amp or compressor amp in mic would
work.

Show quoted text

On 10/18/18, Ian Reeve <ian.radioworkshop@...> wrote:
I have a version 3 uBITX which came with a tiny electret capsule which has
been wired up.
Firstly I am concerned that there is around 11v DC on the audio input, I was
expecting no more than about 5v and secondly that although the power meter
kicks up on a whistly or HOLA,the audio seems low and somewhat muffled.

Receive is fine with good audio and clarity.

May I have any suggestions as to how best to boost the transmit audio
level.

Cheers

Ian Reeve M0IDR

Sent from Mail<> for Windows
10

Re: uBITX microphone suggestions

#60836

11v seem a lot. To have a reasonable average power in SSB I followed the advice by Howard Fidel in my vers. 3 ubitx: ' Change R63 to 24 ohms. The earlier rev boards had 100 ohms there, and V3 has 47. I put another 47 ohm resistor in parallel with the one on the board.'

Show quoted text

Il 19/ott/2018 10:31, <laurent.bury@...> ha scritto:

Hello Ian,

may be you could try this speech process circuit if you haven't seen it yet:
(look at the bottom of the page)

I hope to find some time to test it in the future, looks nice :)

73

--
Laurent F5FIE.

Re: uBITX microphone suggestions

#60835

Hello Ian,

may be you could try this speech process circuit if you haven't seen it yet:
(look at the bottom of the page)

I hope to find some time to test it in the future, looks nice :)

73

--
Laurent F5FIE.

Re: Harmonics and Relay Replacement

#60834

Given that the main problem is the layout, although better relays seem to help, has anyone tried shielding the relays from the PCB using copper tape between the board and relays, soldered to the relays ground pin?? I don't currently have a uBitX, or I'd give it a try. :(

You'd have to be careful to notch the copper so it doesn't short to any other relay pins, but it might help shield the relays...

73,

Carl,.K0MWC

Re: Harmonics and Relay Replacement

Joe Puma

#60833

开云体育

You nailed it with the rework. I probably wouldn’t go through that effort although I don’t mind, but different relays that can keep the issue at bay seems like a no brainer if you don’t want to roll the sleeves up or maybe don’t have the skill to do so.?

Joe

Show quoted text

On Oct 18, 2018, at 11:11 AM, ajparent1/KB1GMX <kb1gmx@...> wrote:

What I'm seeing yet another wish for a single pill fix...

Using better relays even omron G6 series helps... to a point.? That point occurs when the board
layout under the relays (the real cause of issues) takes over.? For all that haven't looked there is
a wiki with pictures.

I've made those filters work with the existing relays and a simple re-wire.

Board layout is a extremely significant contributor to many of the issues.

Fire up your web browse and look here:
/g/BITX20/wiki/uBITX-spur-and-harmonics

Allison

Re: uBITX Encoder PPR ??

Robert McClements

#60832

Brian, that one is an optical encoder with detents decent quality and saves the additional cost of a suitable knob.
have used a faster version with the detents disabled to make it free turning for a HDSDR controller, works really well.

73 Bob GM4CID

Re: Version 4 High Pitch Audio Oscillation #ubitx #ubitx-help

#60831

If it's one of the ceramic resonators on the Nano, I doubt messing with the BFO will be much of a fix.
Move the BFO more than a few hundred Hz and the rig will no longer work properly.
(You could try moving the BFO to the other side of the 12mhz crystal filter, but that would require changes to the Nano's sketch)
The ceramic resonators are quite unstable, as Barry's "goes higher in pitch" statement suggests.
They are typically spec'd for something like +/- 100 khz, which may explain why most of us don't have the problem.

When the USB port from the Nano is not connected to a host computer,
the 12mhz oscillator for the USB interface on the Nano is not operating.
So if it's from the Nano, it would be from the 16mhz resonator.for the processor clock.
Putting a finger on the 16mhz resonator would definitely push that audio around, likely?
well out of hearing.? ? If so, perhaps a small cap or two will move it over sufficiently, or just
a scrap piece of grounded copper foil brought near the resonator.

Easy to get at the 16mhz resonator on a v3 uBitx
On a v4 uBitx, the Nano is socketed upside down on the other side of the Raduino,
and the 16mhz resonator is not accessible.? Try soldering a short wire to one end or the other
of the resonator, see if the audio tone varies as you bring your finger close to that wire.

? ??/g/BITX20/message/60744

Jerry, KE7ER

Show quoted text

On Thu, Oct 18, 2018 at 10:18 AM, barry halterman wrote:

I too have noticed this high pitch that goes higher in pitch until it hits that magical point that I just can't hear it. I also have noticed microphonics when I push the encoder for band changes, rap the metal cabinet or tap the radio pcb.
Reminds me of a DC receiver.

Barry K3BO

toggle quoted message. . .
?

On Thu, Oct 18, 2018, 12:09 PM Arv Evans <arvid.evans@...> wrote:

David

?

Try lightly touching the 12 MHz crystal that drives the USB port on your Arduino Nano.

Also try lightly touching the 16 MHz crystal that drives the Arduino processor itself.

It may be that one of your on-board oscillators, or harmonics of same, could be getting

into the IF of your uBITX.? It that is the case re-aligning the BFO may be a fix.

?

Arv

_._

?

On Thu, Oct 18, 2018 at 10:04 AM David Posthuma <davep@...> wrote:

I have a problem with high pitch audio oscillation. I have tried several audio amps to boost the audio of the week Audio Amplifier in version 4. I am rigging all lines with RG-174 coax for maximum shielding, and I have tried various capacitor?and electrolytic?capacitor bleeds to ground with very little impact. I am trying to ground to one single point on the v. 4 board to minimize ground loops. Anyone else have any ideas for a solution?

Re: Version 4 High Pitch Audio Oscillation #ubitx #ubitx-help

#60830

I too have noticed this high pitch that goes higher in pitch until it hits that magical point that I just can't hear it. I also have noticed microphonics when I push the encoder for band changes, rap the metal cabinet or tap the radio pcb.

Reminds me of a DC receiver.

Barry K3BO

Show quoted text

On Thu, Oct 18, 2018, 12:09 PM Arv Evans <arvid.evans@...> wrote:

David

Try lightly touching the 12 MHz crystal that drives the USB port on your Arduino Nano.
Also try lightly touching the 16 MHz crystal that drives the Arduino processor itself.
It may be that one of your on-board oscillators, or harmonics of same, could be getting
into the IF of your uBITX.? It that is the case re-aligning the BFO may be a fix.

Arv
_._

On Thu, Oct 18, 2018 at 10:04 AM David Posthuma <davep@...> wrote:
I have a problem with high pitch audio oscillation. I have tried several audio amps to boost the audio of the week Audio Amplifier in version 4. I am rigging all lines with RG-174 coax for maximum shielding, and I have tried various capacitor?and electrolytic?capacitor bleeds to ground with very little impact. I am trying to ground to one single point on the v. 4 board to minimize ground loops. Anyone else have any ideas for a solution?

Re: uBITX Encoder PPR ??

Brian Arnott

#60829

Hi all,
what about trying to incorporate one of these instead of an encoder?

de G3YYT

uBITX microphone suggestions

Ian Reeve

#60828

开云体育

I have a version 3 uBITX which came with a tiny electret capsule which has been wired up.

Firstly I am concerned that there is around 11v DC on the audio input, I was expecting no more than about 5v and secondly that although the power meter kicks up on a whistly or HOLA,the audio seems low and somewhat muffled.

?

Receive is fine with good audio and clarity.

?

May I have any suggestions as to how best to boost the transmit audio level.

?

Cheers

?

Ian Reeve M0IDR

?

Sent from for Windows 10

?

Re: Version 4 High Pitch Audio Oscillation #ubitx #ubitx-help

#60827

David

Try lightly touching the 12 MHz crystal that drives the USB port on your Arduino Nano.

Also try lightly touching the 16 MHz crystal that drives the Arduino processor itself.

It may be that one of your on-board oscillators, or harmonics of same, could be getting

into the IF of your uBITX.? It that is the case re-aligning the BFO may be a fix.

Arv

_._

Show quoted text

On Thu, Oct 18, 2018 at 10:04 AM David Posthuma <davep@...> wrote:

I have a problem with high pitch audio oscillation. I have tried several audio amps to boost the audio of the week Audio Amplifier in version 4. I am rigging all lines with RG-174 coax for maximum shielding, and I have tried various capacitor?and electrolytic?capacitor bleeds to ground with very little impact. I am trying to ground to one single point on the v. 4 board to minimize ground loops. Anyone else have any ideas for a solution?

Re: Harmonics and Relay Replacement

#60826

These things are complicated, I certainly wouldn't say anybody's being phony.

There are multiple reports of Axicom relays mostly solving the issue of harmonics (except 40m?)
as measured by a spectrum analyzer.

The board layout looks problematic, it may prove necessary to at least replace
a few traces with coax?while the relays are off the board.

There are a lot of things about the $120 uBitx that do not conform to standard practice
for an all band HF transceiver.? But we're very close to simple solutions that make the uBitx
meet regs.? No reason to disparage those contributing weeks of their available time in the attempt

The easily discouraged should hang back for another week or two till this all sorts out.
You didn't finish reading War and Peace yet, did you?

Jerry, KE7ER

Show quoted text

On Thu, Oct 18, 2018 at 08:27 AM, iz oos wrote:

Welcome back Allison, I have been convinced too by these phony people to simply replace the relays.

Version 4 High Pitch Audio Oscillation #ubitx #ubitx-help

#60825

I have a problem with high pitch audio oscillation. I have tried several audio amps to boost the audio of the week Audio Amplifier in version 4. I am rigging all lines with RG-174 coax for maximum shielding, and I have tried various capacitor?and electrolytic?capacitor bleeds to ground with very little impact. I am trying to ground to one single point on the v. 4 board to minimize ground loops. Anyone else have any ideas for a solution?

Re: Harmonics and Relay Replacement

#60824

Welcome back Allison, I have been convinced too by these phony people to simply replace the relays. I suspect some of them work for either Axicom or the Farnell :)

Show quoted text

Il 18/ott/2018 17:11, "ajparent1/KB1GMX" <kb1gmx@...> ha scritto:

What I'm seeing yet another wish for a single pill fix...

Using better relays even omron G6 series helps... to a point.? That point occurs when the board
layout under the relays (the real cause of issues) takes over.? For all that haven't looked there is
a wiki with pictures.

I've made those filters work with the existing relays and a simple re-wire.

Board layout is a extremely significant contributor to many of the issues.

Fire up your web browse and look here:
/g/BITX20/wiki/uBITX-spur-and-harmonics

Allison

Re: Harmonics and Relay Replacement

#60823

What I'm seeing yet another wish for a single pill fix...

Using better relays even omron G6 series helps... to a point.? That point occurs when the board
layout under the relays (the real cause of issues) takes over.? For all that haven't looked there is
a wiki with pictures.

I've made those filters work with the existing relays and a simple re-wire.

Board layout is a extremely significant contributor to many of the issues.

Fire up your web browse and look here:
/g/BITX20/wiki/uBITX-spur-and-harmonics

Allison