Date   
message for Uwe DF1UB

Peter Russell <peter.russell@...>
 

Hello Uwe,

got your email regarding SMD inductors but my reply to you was bounced.

PayPal is fine to

peter.russell@...

Will post them out as soon as possible.

Peter.

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FYI: Ordering and shipping time update for my µBITX

Andy Record
 

Hello all,

Just a data point on ordering and shipping.  I order my µBITX with the extra $10 DHL shipping on February 7th, it shipped from Hydrabad on February 22, 2019 and was delivered on February 25th by DHL.  I was not aware of the version change when I ordered, so happily I have a V5 board (not that I would know any difference)

I am 100% satisfied with fulfillment time and shipping.  Now on to building!

Andy
KF6TJR


Re: message for Uwe DF1UB

Uwe , DF1UB
 

hi Peter,
your email is not visible. Pls have a look at qrz.com under my callsign, there will be my email adress.tnx.

Re: message for Uwe DF1UB

Karl Heinz Kremer, K5KHK
 

You can always send a private message via the groups.io system: Just select the "Private" button under the message editor:


--
Karl Heinz - K5KHK

Re: message for Uwe DF1UB

Peter Russell <peter.russell@...>
 

It was a message to

jento23@...

that bounced.

Maybe it's my ISP.

Anyway, you should have my paypal details from my last email.

Peter


On 01/03/2019 16:14, Uwe , DF1UB wrote:
hi Peter,
your email is not visible. Pls have a look at qrz.com under my callsign, there will be my email adress.tnx.
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Spectrum test on the second V5 build SURPRISING results #ubitx

Jim Sheldon
 

I got my 2nd Version 5 uBITX in the other day.  I took the time to build it into a nice case and very carefully wired everything up.  I actually made up a shielded "digital" cable using the regular wires and encased them in the silver plated shield from some double shielded RG58 sized, Teflon insulated Coax.  I connected the yellow ground wire to the "digital' connector end of the shield and also used another short piece of the yellow ground wire connected between the encoder end of the shield and the encoders ground or "C" pin.  The shield only extended to just short of the Encoder and the Key lines and PTT line remained unshielded from that point on.

I built it into the same eBAY case that Jack and Al used for their JackAl builds.  I did make an aluminum front panel to make it easier for me to mill out the display window and painted it with 3 coats of Testors blue glossy lacquer.  The original case bottom, top and panels were heavily painted and not good candidates for grounding so I removed the paint around all holes in the bottom and steel rear panel.  I also grounded the panels using solder lugs and some more of that silver plated braid to a single point ground under one of the standoffs the V5 board was mounted on using star washers and tightened them as far as I could without stripping or breaking the screws.  I did make up a double shielded, miniature Teflon coax for the RF output cabling.  All other wiring was done as twisted pair or twisted multiple pair wires (including those inside the shield).

I just ran the same exact spectrum test I did on the first Version 5 I received from several weeks ago (the first one was in an open frame aluminum chassis and I did use the twisted pair RF connection between the uBITX board and the SO-239 on the rear panel -- I posted those spectrum data in a previous thread and wasn't really happy with the results.

Here is a picture of the 2nd build and the spectrum plots I got using the exact same setup as for the first version.  (I saved the spectrum analyzer setup as a "Preset" so I could, as closely as possible, duplicate the previous tests.  BTW I did forget to run the test on 60 meters, sorry about that.

Plots are offered here without further comment for you to make your own conclusions.

Jim Sheldon, W0EB
TSW Project Coordinator and Test Engineer

Re: Spectrum test on the second V5 build SURPRISING results #ubitx

Curt
 

Thanks for providing, much nicer. Wow that 40m result is on edge, rest is good. I suggest touching the L5 toroid to see if this harmonic changes. Unless you use very exotic coax, the higher loss at 21 MHz could bring you into compliance.  I am pretty sure that the big rig manufacturers don't test spurs on each item, so perhaps that last dB or two might be subjective.

I hope you are curious how it is on ssb, even though you only do cw we are curious.

Curt

Re: Spectrum test on the second V5 build SURPRISING results #ubitx

Jim Sheldon
 

Curt,
I do use double shielded 50 ohm Teflon coax for all my test cables to minimize radiated RF getting into the spectrum analyzer which is a brand new Siglent SSA 3021X that I just got less than a week ago.

I do not have a microphone for this thing, but I did order a 2 tone test oscillator kit which should be in today's mail so once I get that build, I will do an SSB spur test (if I can figure out just how to set up the Spectrum Analyzer to test for the spurs).

Jim

Re: Spectrum test on the second V5 build SURPRISING results #ubitx

ajparent1/KB1GMX
 

Jim,

For spur testing on 10M single tone will do. 

You need two tone for IMD testing and since the power chain is unchanged I have low
expectations for passable IMD at more than a few watts. 

Allison

Re: Spectrum test on the second V5 build SURPRISING results #ubitx

Ashhar Farhan
 

Jim,
the third harmonic should have been all but gone. tweak the bias of one of the two PA transistors by just enough to null the 3rd harmonic.
- f

On Fri, Mar 1, 2019 at 11:57 PM Jim Sheldon <w0eb@...> wrote:
Curt,
I do use double shielded 50 ohm Teflon coax for all my test cables to minimize radiated RF getting into the spectrum analyzer which is a brand new Siglent SSA 3021X that I just got less than a week ago.

I do not have a microphone for this thing, but I did order a 2 tone test oscillator kit which should be in today's mail so once I get that build, I will do an SSB spur test (if I can figure out just how to set up the Spectrum Analyzer to test for the spurs).

Jim

DC Power in Bitx-40

Pat Anderson
 

I am almost there, a case of sorts will arrive on Sunday. I understand most of the wire-up directions, but I am now trying to reconcile the wire-up diagram (on 2/11 of the wire-up directions) with the text on  DC Power Connections (on 3/11), as well as how  to connect the Raduino power, both positive and ground, do it is controlled by the off/on switch, which is neither illustrated nor explained in text.

Header text for DC Power Connections, the DC power from the socket goes to the board through the off/on switch through the off/on swtch on the volume control. Check. The next sentence is very confusingly worded though: from the OFF/ON switch, route the power a parallel connection also goes to the power amplifier." If this a direction to do something with "route" as a verb, or a description? Does this mean I can remove the separate cable from the board  that says PA Power since power also goes there? I am guessing that is what it means and I do not need to route anything to the power amplifier. Correct?

First bullet sentence, use two-wire connector as shown in diagram to supply DC power to the board - check! Clearest direction in the DC power section!

Fourth bullet sentence, you may route the positive power line through the ON/OFF switch on the volume control - don't get this, seems inconsistent with the header text. Isn't power already routed there from the PWR1 connector to the off/on switch on the volume control? 

Fifth bullet sentence, use another PA POWER line to feed power to the Power Amplifier, this is shown on the top-left of the ow the wiring diagram. Same head scratcher, what is shown is just the wires going off the  left edge of the board, not connected back to where the 12 volt power comes in according to the first bullet sentence. I am assuming the Power Amplifier already has power going to it from the volume control, this is only if I wanted to supply a higher voltage to the PA, so I could remove the cable from the PA Power connector? Correct?

Wire up the Raduino (on 4/11), again, the Raduino power wires are just sort of out there hanging in space without referencing connection to where the power comes into the main board. Plus, I want the Raduino power to be controlled by the off/on switch on the volume control as well, don't I? How to do that? My guess is just bring those power wires back to connector where power comes into the board?

The patience and helpfulness of the collective has been very much appreciated, once again I am asking for help to cross the finish line!

TIA!

Pat Anderson
KD7OAC


Re: Spectrum test on the second V5 build SURPRISING results #ubitx

Jim Sheldon
 

Hi Ashhar,
I hesitated to do that as I had the transceiver completely buttoned up when I ran the tests. 

Which band(s) do you want me to run that test on?

The 2 tone test generator kit I ordered is here.  I ordered it from Pacific Antenna and it has the advantage of being able to select either the high tone, low tone or combined two tones just by changing output jacks.

I have to build it now, so it will be at least tomorrow before I even try to run the tone tests.

Jim

Re: DC Power in Bitx-40

Curt
 

Pat

If this is like the ubitx, the bias to the IRF510 is separate to allow running it at a higher voltage.

No this is RF power amplifier,  no connection with the audio volume control, pu intended. 

I like to check my work before making connection with the circuit board.

Raduino itself operates at 5 volts. Locate the regulator, and you should understand its feed from 12 volts. In ubitx this happens within the circuit board.

As you wire up 12 volts, note the negative side goes direct to the circuit board, while the plus side may ge routed through a reverse protection diode, a fuse, and a power switch. I have my main and PA wires connected after the power switch.

Curt

Re: Spectrum test on the second V5 build SURPRISING results #ubitx

Gordon Gibby
 

80 and 40 both look like they had problems. Perhaps the bias change or perhaps a little less drive?

Need to get everything 43 DB below the fundamental



On Mar 1, 2019, at 21:21, Jim Sheldon <w0eb@...> wrote:

Hi Ashhar,
I hesitated to do that as I had the transceiver completely buttoned up when I ran the tests. 

Which band(s) do you want me to run that test on?

The 2 tone test generator kit I ordered is here.  I ordered it from Pacific Antenna and it has the advantage of being able to select either the high tone, low tone or combined two tones just by changing output jacks.

I have to build it now, so it will be at least tomorrow before I even try to run the tone tests.

Jim

Re: Spectrum test on the second V5 build SURPRISING results #ubitx

Jim Sheldon
 

Ok Ashhar,
I did your bias change while watching the 2nd and 3rd harmonic on 80 meters.  Sorry, but changing the bias reduces the heck out of the 2nd harmonic but has very little effect on the third.  The attached picture shows the final results.

I now have the tone generator kit, and after I finish writing this I'll start building it so I can do the single and two tone tests on the rig.

Jim, W0EB

Re: Spectrum test on the second V5 build SURPRISING results #ubitx

Jim Sheldon
 

Yes, I know Gordon, but changing the bias and dropping the drive did not have enough effect on the harmonics on 80/40 to eliminate the problem.  The lowest LPF needs a sharper upper cutoff frequency in order to get rid of them.  Beyond my expertise.

Jim

Re: DC Power in Bitx-40

Pat Anderson
 

I don't think it is like the ubitx, hoping to hear from somebody who knows the bitx-40 inside and out! And the bitx-40 wire-up diagram shows  the Raduino having 12 volts + and minus!


On Fri, Mar 1, 2019 at 12:31 PM Curt via Groups.Io <wb8yyy=yahoo.com@groups.io> wrote:
Pat

If this is like the ubitx, the bias to the IRF510 is separate to allow running it at a higher voltage.

No this is RF power amplifier,  no connection with the audio volume control, pu intended. 

I like to check my work before making connection with the circuit board.

Raduino itself operates at 5 volts. Locate the regulator, and you should understand its feed from 12 volts. In ubitx this happens within the circuit board.

As you wire up 12 volts, note the negative side goes direct to the circuit board, while the plus side may ge routed through a reverse protection diode, a fuse, and a power switch. I have my main and PA wires connected after the power switch.

Curt

Re: Spectrum test on the second V5 build SURPRISING results #ubitx

Gordon Gibby
 

Thanks for running that test! Sad to say that the bias and drive did not cure the issue   

I am trying to raise finances to go buy a spectrum analyzer myself, and then I’ll actually put a bit of miniature coax to the outboard relay board that I built and find out if my early successful  tests are confirmed.  

Certainly the filters can always be improved if that is the issue.  

Gordon



On Mar 1, 2019, at 22:30, Jim Sheldon <w0eb@...> wrote:

Yes, I know Gordon, but changing the bias and dropping the drive did not have enough effect on the harmonics on 80/40 to eliminate the problem.  The lowest LPF needs a sharper upper cutoff frequency in order to get rid of them.  Beyond my expertise.

Jim

Re: DC Power in Bitx-40

Pat Anderson
 

Here is the wiring diagram for the main board and the Raduino, clearly showing 12 volts to the Raduino, but showing no connection for the power back to the main board.


On Fri, Mar 1, 2019 at 1:32 PM Pat Anderson via Groups.Io <anderson5420=gmail.com@groups.io> wrote:
I don't think it is like the ubitx, hoping to hear from somebody who knows the bitx-40 inside and out! And the bitx-40 wire-up diagram shows  the Raduino having 12 volts + and minus!


On Fri, Mar 1, 2019 at 12:31 PM Curt via Groups.Io <wb8yyy=yahoo.com@groups.io> wrote:
Pat

If this is like the ubitx, the bias to the IRF510 is separate to allow running it at a higher voltage.

No this is RF power amplifier,  no connection with the audio volume control, pu intended. 

I like to check my work before making connection with the circuit board.

Raduino itself operates at 5 volts. Locate the regulator, and you should understand its feed from 12 volts. In ubitx this happens within the circuit board.

As you wire up 12 volts, note the negative side goes direct to the circuit board, while the plus side may ge routed through a reverse protection diode, a fuse, and a power switch. I have my main and PA wires connected after the power switch.

Curt

Re: DC Power in Bitx-40

Pat Anderson
 

Here is the wire-up diagram clearly showing 12 volts to the Raduino.


On Fri, Mar 1, 2019 at 1:32 PM Pat Anderson via Groups.Io <anderson5420=gmail.com@groups.io> wrote:
I don't think it is like the ubitx, hoping to hear from somebody who knows the bitx-40 inside and out! And the bitx-40 wire-up diagram shows  the Raduino having 12 volts + and minus!


On Fri, Mar 1, 2019 at 12:31 PM Curt via Groups.Io <wb8yyy=yahoo.com@groups.io> wrote:
Pat

If this is like the ubitx, the bias to the IRF510 is separate to allow running it at a higher voltage.

No this is RF power amplifier,  no connection with the audio volume control, pu intended. 

I like to check my work before making connection with the circuit board.

Raduino itself operates at 5 volts. Locate the regulator, and you should understand its feed from 12 volts. In ubitx this happens within the circuit board.

As you wire up 12 volts, note the negative side goes direct to the circuit board, while the plus side may ge routed through a reverse protection diode, a fuse, and a power switch. I have my main and PA wires connected after the power switch.

Curt