Date   
Re: Speaker query #ubitx

ohwenzelph
 

On Sun, Jan 21, 2018 at 09:25 am, <tommason56@...> wrote:
Gents. Many thanks for your responses, very much appreciated. 
73.
Tom
M3TEG.
Best speaker:
Impression/suspicion from following this thread for a while is that with the Bitx40v3, which uses a LM386, that people have been happiest when the speaker is not tiny, so maybe 4 to 8 inches would be good, and it seems like 16 ohms might be better than 8.


Nobody mentions how many watts the speaker is rated for so maybe that’s not an issue.


If you do some comparisons and think you have found a definitive solution to the question then please post it. I have tried a bunch of smaller 8 ohm speakers and some are a bit nicer than others but so far have no conclusion as to which direction is best. There is a lot of high pitched sound that I do not need, above 3 kilo hertz, that comes out of my bitx40v3, I have attenuated it some but don’t know where it’s coming from, and I would like to get rid of it at the source.

Good luck!
 
jerry aa1of/6

Re: Speaker query #ubitx

Tim Gorman
 

Some speakers require a specific damping factor to sound the best. A
small speaker in a small case, e.g. a microphone, has a high damping
factor, it keeps the speaker cone travel from moving too far. Your
fingers may be doing the same thing. Volume depends on the amount of
air the speaker moves. With no damping it may be moving out to the
maximum point of travel and just vibrating at that point instead of
using the full travel possible from the speaker.

tim ab0wr

On Sun, 21 Jan 2018 07:58:06 -1000
"Steve Thatcher" <stevep2p@...> wrote:

While Tom's got your attention on speakers, I've got a interesting
problem: I have a 1.5", 8 Ohm speaker I liberated from an old FRS
radio. As you can imagine, the sound quality from this speaker on the
BTX40 is not very good. However, when I encircle the speaker with my
thumb and forefinger, the volume and clarity improve dramatically.
I've tried putting it in a piece of PVC, or surrounding it with a
metallic "ring", and no change. What gives? Do I have magic
fingers? BTW the MFJ 281 accessory speaker is working pretty good
for my '40. My first (of many, I suppose....) post to the group.
Hope I did this right....Aloha, Steve WH6ST

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Re: Power Supply Option

Steve
 

I bought something that looks pretty much exactly the same.  Be advised, as soon as you put any load on it, the fan will come on.  I just moments ago put a load on mine (a CB radio under TX), and the fan noise increased substantially.  I used the CB to test it as I recall previously using the PS and having it go to 16-18V under load (hence the CB- didn't want to risk my good stuff....).  This time it stayed at 12.8 or so.  YMMV.  Aloha, Steve WH6ST

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Re: #ubitx and 6 meters #ubitx

Tom Christian
 

Thank you for testing that, Marco!  I really appreciate it!  Thanks also for the comments, Bill.  When my ubitx finally arrives, I'll do some follow up.
Tom
AB7WT

Re: Power Supply Option

Rob Snow
 

I'm looking at this 12v 30a/360w power supply that was suggested by someone recently.  It has adustable output and runs a whopping $21.49 delivered from Amazon.  If it doesn't suck, it'll be handy to have around.

Re: Speaker query #ubitx

Steve
 

While Tom's got your attention on speakers, I've got a interesting problem:  I have a 1.5", 8 Ohm speaker I liberated from an old FRS radio.  As you can imagine, the sound quality from this speaker on the BTX40 is not very good.  However, when I encircle the speaker with my thumb and forefinger, the volume and clarity improve dramatically.  I've tried putting it in a piece of PVC, or surrounding it with a metallic "ring", and no change.  What gives?  Do I have magic fingers?  BTW the MFJ 281 accessory speaker is working pretty good for my '40.  My first (of many, I suppose....) post to the group.  Hope I did this right....Aloha, Steve WH6ST

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Re: Verifying errors with version 1.27.7

KC9SGV <kc9sgv@...>
 

The sketch now compiles after getting some more libraries.
I still get an upload error.

With the BitX40 off, the IDE does not see the com port.
With the BitX40, on, the serial monitor shows the *Si5350 ON, but the IDE returns an upload error after compiling the Sketch successfully.

I wish I had some prior Arduino expertise....
KC9SGV


On Sat, Jan 20, 2018 at 9:04 PM, Vic WA4THR via Groups.Io <vhklein@...> wrote:
You do need to include some libraries or it will return errors. Once that was done in my case, every sketch has compiled and loaded to the Raduino without a hitch.

=Vic=


Speaker query #ubitx

tommason56@...
 

Gents. Many thanks for your responses, very much appreciated. 
73.
Tom
M3TEG.

Re: Speaker query #ubitx

chris gress <Chrisg0wfh@...>
 

I only ever used headphones much better when portable chris G0WFH

On 21 Jan 2018 16:26, "philip yates" <phil@...> wrote:
Using an 8Ω 2 watt 3 inch speaker with my Bitx40, sounds really nice.
Now looking for the same for my µBitx.

Phil - G7BZD

On Sun, Jan 21, 2018 at 3:54 PM, Tim Gorman <tgorman2@...> wrote:
Tom,

I don't know the impedance but I have always used commercial
communications speakers like this:
www.ebay.com/itm/GE-Mobile-Dash-Mount-Speaker-Black-Vintage-Classic-w-Wire-Harness-4389/311026638213?hash=item486aa1dd85:g:MWoAAOSwxH1T1DiK

They just seem to work better with every radio I have owned, from Icom
to Kenwood to Yaesu. I suspect even with a bitx/ubitx.

I even used to have an old outdoor movie speaker that was terrific but
it got lost in my various moves in the past. Shame.

tim ab0wr

On Sun, 21 Jan 2018 00:23:21 -0800
tommason56@... wrote:

> Hi. I'm new to these kits but before I get too involved with the
> building is there a specific value of speaker (3.2/8 ohm) that
> performs better. Any help greatly appreciated.
>
> 73.
> Tom.
> M3TEG






Re: Software support Request for Full QSK BITX40

Gary O'Neil
 

Here  ya go as best I can do on the road. I hope anybody that does this with the relays in their radio posts their findings. I would like to bless it with my  approval, but I won’t do this without having tested it for hidden demons that might arise in a contact bouncing environment. Resistor values are not critical and only serve as base current limiters. This should solve the self interference problem in all single channel systems of similar design, and is an absolute requirement to achieve Full QSK performance. If better understanding is needed, or important enough to optimize; you will need to 1) wait for me to test, document, and publish it, or 2) work through it on your own... a faster and fairly simple and basic task.

72

Gary, N3GO



7

Re: Speaker query #ubitx

philip yates
 

Using an 8Ω 2 watt 3 inch speaker with my Bitx40, sounds really nice.
Now looking for the same for my µBitx.

Phil - G7BZD

On Sun, Jan 21, 2018 at 3:54 PM, Tim Gorman <tgorman2@...> wrote:
Tom,

I don't know the impedance but I have always used commercial
communications speakers like this:
www.ebay.com/itm/GE-Mobile-Dash-Mount-Speaker-Black-Vintage-Classic-w-Wire-Harness-4389/311026638213?hash=item486aa1dd85:g:MWoAAOSwxH1T1DiK

They just seem to work better with every radio I have owned, from Icom
to Kenwood to Yaesu. I suspect even with a bitx/ubitx.

I even used to have an old outdoor movie speaker that was terrific but
it got lost in my various moves in the past. Shame.

tim ab0wr

On Sun, 21 Jan 2018 00:23:21 -0800
tommason56@... wrote:

> Hi. I'm new to these kits but before I get too involved with the
> building is there a specific value of speaker (3.2/8 ohm) that
> performs better. Any help greatly appreciated.
>
> 73.
> Tom.
> M3TEG





Re: Speaker query #ubitx

tommason56@...
 

Thanks Jeffrey. Your reply is very much appreciated.
73.
Tom

Re: Speaker query #ubitx

tommason56@...
 

Thanks Dennis, much appreciated.
73.
Tom.

Re: Speaker query #ubitx

Jerry Gaffke
 

LM386 datasheet on page 7 says 4 to 32 ohms 
    http://www.ti.com/lit/ds/symlink/lm386.pdf
I'd go with 8 ohms.

Generally speaking, a larger diameter speaker is more efficient than smaller.
Bigger heavier magnets are better.
Differences between speakers can be quite drastic in both sound volume and fidelity.


On Sun, Jan 21, 2018 at 12:23 am, <tommason56@...> wrote:
Hi. I'm new to these kits but before I get too involved with the building is there a specific value of speaker (3.2/8 ohm) that performs better. 
Any help greatly appreciated.

Re: Software support Request for Full QSK BITX40

Tim Gorman
 

Bill,

QSK while ragchewing or contesting is pretty much of a waste. Semi-qsk
is fine for those.

But I used to use QSK all the time when I was traffic handling on cw.
You didn't need to send a whole string of characters for a fill when
the other end didn't copy. The other end could just break in
immediately after the missed character(s).

Been a ham for 54 years and did a lot of cw traffic back in the day. It
kind of died off about 20 years ago and I don't need it any more.
Semi-qsk with the modern radios seems to work fine for me.

tim ab0wr

On Sun, 21 Jan 2018 10:47:02 -0400
"K9HZ" <@Doc_Bill> wrote:

We were thinking the same thing... shorting the opposite rail to
ground of the mode you are in. My circuit was a bit different using
a modified schmitt to the base of the transistors but it provides the
same result (that way one is not on while one is off at any time).
And i know i can design a diode switch that takes less current than
the relay coil so good there.

Im a CW op too for close to 50 years ... in major contests too but I
never got the QSK thing. Seemed like a telephone call in the middle
of another call to me but thats just me. It would probably work for
my wife who thinks much differently than me.


Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ
PJ2/K9HZ
Owner - Operator
Big Signal Ranch – K9ZC
Staunton, Illinois

Owner – Operator
Villa Grand Piton - J68HZ
Soufriere, St. Lucia W.I.
Rent it: www.VillaGrandPiton.com

email: @Doc_Bill

Re: ubitx with my Cabinet

Tim Gorman
 

Does your case get hot at all with the 510's mounted to the back panel?

tim ab0wr

On Sun, 21 Jan 2018 20:16:44 +0530
"Prathap Naidu" <vu2pop@...> wrote:

Hi all

My new year & birthday wish came a bit late but feels great to have
the ubitx in my new cabinet

Farhan had given me a first beta ubitx some months ago for testing
and works great



In these pics you will see the latest ubitx wired up into my new
cabinet this afternoon and had many QSOs this evening, with very good
reports

More details on my facebook page

Enjoying homebrewing & ubitxing

thanks 73

Pop

VU2POP

Re: Speaker query #ubitx

Tim Gorman
 

Tom,

I don't know the impedance but I have always used commercial
communications speakers like this:
www.ebay.com/itm/GE-Mobile-Dash-Mount-Speaker-Black-Vintage-Classic-w-Wire-Harness-4389/311026638213?hash=item486aa1dd85:g:MWoAAOSwxH1T1DiK

They just seem to work better with every radio I have owned, from Icom
to Kenwood to Yaesu. I suspect even with a bitx/ubitx.

I even used to have an old outdoor movie speaker that was terrific but
it got lost in my various moves in the past. Shame.

tim ab0wr

On Sun, 21 Jan 2018 00:23:21 -0800
tommason56@... wrote:

Hi. I'm new to these kits but before I get too involved with the
building is there a specific value of speaker (3.2/8 ohm) that
performs better. Any help greatly appreciated.

73.
Tom.
M3TEG

Re: ubitx with my Cabinet

MVS Sarma
 

Very Nice POP jee
The design came out nicely. front panel is simple and decent.
Congrats for such nice design.

regards
 sarma
 vu3zmv

Regards
MVS Sarma
 

On Sun, Jan 21, 2018 at 8:16 PM, Prathap Naidu <vu2pop@...> wrote:

Hi all

My new year & birthday wish came a bit late but feels great to have the ubitx in my new cabinet

Farhan had given me a first beta ubitx some months ago for testing and works great

 

In these pics you will see the latest ubitx wired up into my new cabinet this afternoon and had many QSOs this evening, with very good reports

More details on my facebook page

Enjoying homebrewing  & ubitxing

thanks 73

Pop

VU2POP   


Re: Software support Request for Full QSK BITX40

K9HZ <bill@...>
 

We were thinking the same thing... shorting the opposite rail to ground of the mode you are in.  My circuit was a bit different using a modified schmitt to the base of the transistors but it provides the same result (that way one is not on while one is off at any time).   And i know i can design a diode switch that takes less current than the relay coil so good there.  

Im a CW op too for close to 50 years ... in major contests too but I never got the QSK thing. Seemed like a telephone call in the middle of another call to me but thats just me.  It would probably work for my wife who thinks much differently than me. 


Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ

 

Owner - Operator

Big Signal Ranch – K9ZC

Staunton, Illinois

 

Owner – Operator

Villa Grand Piton - J68HZ

Soufriere, St. Lucia W.I.

Rent it: www.VillaGrandPiton.com


email:  bill@...

 


On Jan 21, 2018, at 1:40 AM, Gary O'Neil <n3go@...> wrote:

Hi Bill;

There’s limited interest in CW these days much less QSK. I’m off on a winter hiatus for a couple weeks or so, and was hoping to inspire Allard to hammer out a new Full QSK feature and have it awaiting my return. :-) It looks like I may need to get a bit more creative and wean the design off some of its software dependencies. 

I became a Navy radioman out of high school, and still pine for the return of those days when working Full QSK was standard operating procedure. I’ve not met any hams yet that actually use it though... not even ex radiomen (including myself). LOL! Many never actually learned how, and many hated having to even use CW if you can imagine that. I spent my entire time at Sea doing nothing but pounding brass while hurling into a bucket. Bittersweet times you might say. 

It sounds like you might be chasing the “Pop Pop Thump Thump” problem with its myriad of patches that almost work.  That’s what I actually set out to solve, but I really wanted Full QSK, and once I convinced myself that fixing those issues wasn’t going to lead me where I wanted to be, I decided to do the whole enchilada and make the problems go away on their own. 

I don’t want to publish anything that I have to defend because it breaks what folks have already done. I’m not compelled to purchase another BITX to verify what might work for you or others, but I can’t come up with a reason (other than the horrible switching speed) why it wouldn’t work with relays as well, and the speed isn’t an issue on SSB. 

You’re welcome to give it a try though, and I’m pretty sure I floated the idea shortly after I got mine running. I never heard whether or not it was ever tried and confirmed, but I’ve discovered that finding stuff in the threads of this group is daunting. 

Simply put, the root cause of those noises is stored supply energy, and they are easily mitigated by simply purging the supplies when they are switched off. It takes just 2 NPN transistors (2N2222/2N3904 or equivalent), and a pair of 2.2k resistors. Emitters of both go to ground, and the collectors go to each of the switched DC rails. The resistors are then connected between the base of each of the transistors, and the collector of the other. 

The the way it works is straight forward. When the transmitter goes active, it bias the transistor across the RX supply which dumps any residual RX supply voltage to ground. The opposite occurs when switching from transmit to receive, and the transmitter power rail is shorted out in the same manner. The 2.2k resistors limit the base current to around 6 ma to protect it from overheating the base-emitter junctions, while turning the transistors on hard enough to create a healthy short circuit across each of the supply rails, but only when they’re no longer being used. 

If no supply voltage. Exists (0 volts) on the transmitter, it can’t interfere with the receiver and vice versa. This works for very fast QSK, and since the relays take 7 ms each to switch, (around 15 ms total), the relay clicks will be the only switching artifact you will hear. 

No guarantees though. I’m not certain how close your radio resembles mine, and other issues may arise out of coexisting patch fixes.

BTW... Diode switches are not QRP friendly. Think 60ma or more. The switch I use consumes less than 100uA. Relays aren’t too friendly either, but they only consume power when transmitting. 

72

Gary, N3GO
 

ubitx with my Cabinet

Prathap Naidu
 

Hi all

My new year & birthday wish came a bit late but feels great to have the ubitx in my new cabinet

Farhan had given me a first beta ubitx some months ago for testing and works great

 

In these pics you will see the latest ubitx wired up into my new cabinet this afternoon and had many QSOs this evening, with very good reports

More details on my facebook page

Enjoying homebrewing  & ubitxing

thanks 73

Pop

VU2POP