Re: Choice of speaker makes a difference
Worth experimenting with the speaker so I found out. I have an ex-Yaesu FT290 1W 8ohm speaker sat on top of the Bitx shipping box, sounded tinny, so I sat it on top of a cardboard tube, sounds really good now. Not bad for a 2inch speaker. Phil-G7BZD
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Choice of speaker makes a difference
Your choice of a speaker for your BITX40 can really make a difference to the receive audio quality. I had been using a small 2-1/4 inch speaker (you can see it to the right of the circuit board in the picture) and struggling with the poor audio quality with lots of hiss. Picked up a small 8 ohm mobile communications speaker in a 3 x 3 x 2-1/4 inch deep black metal case and hooked it up to my Bitx40. Wow! what a difference, much of the hiss is gone and since the speaker is optimized for human voice frequencies, the SSB signals I tune in really stand out. It even improves listening to CW signals. 73, AL VE3RRD 
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It's a great rig. I got in on the first run before the kickstarter.? The only downside, for some people, is the requirement for a PC. There aren't any stand-alone ADC/DAC/DSP boards available that I could find. But I didn't look very deeply because I always need the computer for logging and digital modes anyway.? Eventually I'll get around to finishing my video review.?
73, N?ECK Join The Resistance! http://www.youtube.com/user/resistancehams
Sent from my pocket computer
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Re: compressor or processor for BITX40?
Hi
The FT-817 guys have been down this path. Google around to find information.
Here is one
Randy, K7AGE
On Sun, Feb 19, 2017 at 3:24 AM, Allard PE1NWL <pe1nwl@...> wrote: Yes I know that R136 is used to control the drive to the PA, and I have
already increased it. I do get the normal amount of output power (7W).
It's just that I believe that especially for QRP operation, increasing the
average SSB output power by applying some audio compression could make
this rig more effective. If even many QRO ops use processors, then why
wouldn't QRP ops do the same?
So perhaps some simple compression could be achieved by adding some extra
components at the mike input stage? Does anybody have suggestions for
this?
73, Allard PE1NWL
On Sun, February 19, 2017 03:29, John Smith via Groups.Io wrote:
> Allard, your final amplifier is not being driven enough. You have low
> transmit power. If you have followed the wire up process by inserting your
> amp meter in the PA positive brown wire and it read 100mA but not 1Amp
> when you spoke into the mic, then you need to adjust R136. It's a flat
> silver trimmer on the same side of the board as the PA. Adjust it counter
> clockwise to increase your drive until speaking into the mic with a long
> aahhh gets you 1 Amp on your meter. If your meter doesn't show 100mA
> first, then you need to adjust RV1 blue trimmer counter clockwise until
> you do get the 100mA the adjust R136 to get 1Amp.
>
> This really does need to be included in the wire up notes. It could have
> saved me a whole dang month Farhan!
>
> Not to mention the diode I needlessly removed while desperately trying any
> possible solution to the low TX power problem.
>
> At least you changed the red vs. brown calibration wire kills the raduino
> thing.
>
> I'm still bitter!
>
> Sorry Allard, just read the first paragraph.
>
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Re: bitx output harmonics
What's this about and what did I miss? Might be a good one to attach to the original email.
Jack, W8TEE
From: John Backo via Groups.Io <iam74@...>
To: [email protected]
Sent: Sunday, February 19, 2017 1:17 AM
Subject: Re: [BITX20] bitx output harmonics
Pay attention to this one, guys. It is important.
john
AD5YE
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Re: bitx output harmonics
ND6T had a nice informative post about a month before: ??
On Sat, Feb 18, 2017 at 10:05 pm, Ashhar Farhan wrote: Wayne has provided a one-capacitor fix for the spectral output of the bitx. Just solder a 100pf across the L7.Read his email here
? ?
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Re: bitx output harmonics
Or this one: http://bitxhacks.blogspot.com/2017/01/nd6ts-suppression-of-pesky-2nd-harmonic.html?? de ND6T
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You can inject a few millamps into the modulator at the center tap. - f
On 19 Feb 2017 7:09 p.m., "Ken" < chase8043@...> wrote: How do I go about unbalancing the mixer to produce a carrier?
I know that R106 balances the mixer for no carrier. So I assume a small value resistor to unbalance it.
73
Ken VA3ABN
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How do I go about unbalancing the mixer to produce a carrier?
I know that R106 balances the mixer for no carrier. So I assume a small value resistor to unbalance it.
73
Ken VA3ABN
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I have a RS-HFIQ running with a 60 dollar windows 10 tablet and 2 external USB sound cards. It works very nicely but no 160 meters.? Mike WA3O
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Re: BITX40 - no RX, no TX
I need information about the core of the transformer T4. There are 9 trifilar turns 0.4 mm wire on core unknow for me.
thank you
Tom
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Re: bitx output harmonics
In his note it is stated to use a cap with a
suitable voltage rating. What would that rating be? Thanks Steve
kb1chu
On 02/19/2017 01:05 AM, Ashhar Farhan
wrote:
toggle quoted message
Show quoted text
Wayne has provided a one-capacitor fix for the
spectral output of the bitx. Just solder a 100pf across the L7.
Read his email here
- f
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Re: compressor or processor for BITX40?
Yes I know that R136 is used to control the drive to the PA, and I have
already increased it. I do get the normal amount of output power (7W).
It's just that I believe that especially for QRP operation, increasing the
average SSB output power by applying some audio compression could make
this rig more effective. If even many QRO ops use processors, then why
wouldn't QRP ops do the same?
So perhaps some simple compression could be achieved by adding some extra
components at the mike input stage? Does anybody have suggestions for
this?
73, Allard PE1NWL
toggle quoted message
Show quoted text
On Sun, February 19, 2017 03:29, John Smith via Groups.Io wrote: Allard, your final amplifier is not being driven enough. You have low
transmit power. If you have followed the wire up process by inserting your
amp meter in the PA positive brown wire and it read 100mA but not 1Amp
when you spoke into the mic, then you need to adjust R136. It's a flat
silver trimmer on the same side of the board as the PA. Adjust it counter
clockwise to increase your drive until speaking into the mic with a long
aahhh gets you 1 Amp on your meter. If your meter doesn't show 100mA
first, then you need to adjust RV1 blue trimmer counter clockwise until
you do get the 100mA the adjust R136 to get 1Amp.
This really does need to be included in the wire up notes. It could have
saved me a whole dang month Farhan!
Not to mention the diode I needlessly removed while desperately trying any
possible solution to the low TX power problem.
At least you changed the red vs. brown calibration wire kills the raduino
thing.
I'm still bitter!
Sorry Allard, just read the first paragraph.
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Is it a Problem with the BFO circuit ? .. Ide have a look here ..
On Sat, 18 Feb 2017 at 21:21, Mark Underkofler <mark@...> wrote: I built a BITX40.? It has a clicking noise in the audio different from the clicks from the Raduino when tuning.? It appears to be a problem in the front end.? When I first connected the antenna there was a great increase in band noise.? When I can somewhat ¡°tune¡± a signal, it is just wide band grunting noise when the person talks.? I¡¯ve made a movie of it and can post if anyone is interested.
Fahran said it may be the power supply so I switched to a 12 battery and still have the clicking.? No real signal gets through.? The audio works and the Raduino seems to tune frequency at least it reads 7.200 etc¡
Looking for suggestions.? I built it in a plastic box so there doesn¡¯t seem to be a shorting problem.? No cold solder joints.? No loss toroids.? Shortened all the cables and that did nothing.
Any suggestions would be appreciated.
Mark Underkofler W5MCU
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Re: compressor or processor for BITX40?
I just wired up a cheap CB microphone, I'm using a Sadelta Bravo Plus ..I ?bought it as it was cheap and it's been in my box of Bits for sometime, I knew it would come in handy though ?:-)
On Sun, 19 Feb 2017 at 0:37, Allard PE1NWL <pe1nwl@...> wrote: With QRP levels it is often a challenge to make SSB QSO's on 40m. With my BITX40 I need to shout in the mike to produce some TX power.
It would seem logical to increase the "talking power" somewhat by using a compressor or processor.
Does anybody have suggestions how this could be realized in a simple way?
73, Allard PE1NWL
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Re: compressor or processor for BITX40?
Hello Allard ,
I have the same experience and therefore I am thinking about building the PA0FRI RF speech processor for the Bitx40.
Go to
Select: "MISC "
And then select: " double-sideband speech processor", the sixth item in the list .
A kit can be ordered at www.kent-Electronics.nl
73, Cor - PA4Q
With QRP levels it is often a challenge to make SSB QSO's on 40m. With my BITX40 I need to shout in the mike to produce some TX power.
It would seem logical to increase the "talking power" somewhat by using a compressor or processor.
Does anybody have suggestions how this could be realized in a simple way?
73, Allard PE1NWL
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Re: GPS corrected Arduino controlled VFO
toggle quoted message
Show quoted text
On Sun, Feb 19, 2017 at 12:21 PM, Ramesh v via Groups.Io <vu3vrl@...> wrote:
Adi Ramesh
Sent from Yahoo Mail on Android
On Sun, 19 Feb, 2017 at 4:02 AM, gene marcus Hello Bob,
I authored the article that you are referring to. The article is located
at: < >. ??I recently
modified the code to run on the Raduino. ?GPS frequency correction?is optional. If anyone is
interested in receiving a copy of the Raduino?version just send me an email.
Gene W3PM GM4YRE
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Re: GPS corrected Arduino controlled VFO
Adi Ramesh
Sent from Yahoo Mail on Android
On Sun, 19 Feb, 2017 at 4:02 AM, gene marcus <gmarcus@...> wrote: Hello Bob,
I authored the article that you are referring to. The article is located
at: < http://www.knology.net/~gmarcus/Si5351/Si5351_VFO_QEX.pdf>. ??I recently
modified the code to run on the Raduino. ?GPS frequency correction?is optional. If anyone is
interested in receiving a copy of the Raduino?version just send me an email.
Gene W3PM GM4YRE
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Re: bitx output harmonics
use what you have. if it blows up. write about it.
- f
On Sun, Feb 19, 2017 at 12:01 PM, John Smith via Groups.Io <johnlinux77@...> wrote: I'm on it. I only have a basic ceramic cap marked 101 will this do? Or does it need to be monolithic or something different? We shouldn't have any noticeable differences in our daily operating styles, shall we?
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Re: bitx output harmonics
I'm on it. I only have a basic ceramic cap marked 101 will this do? Or does it need to be monolithic or something different? We shouldn't have any noticeable differences in our daily operating styles, shall we?
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Don, ND6T
Allard PE1NWL
Marc Jones