Date   
Re: VK3YE AGC pcb.

David Wilcox
 

I second the thoughts of Jack.  I am 73 with declining vision but have had no or very little trouble with SMD.  I use one of the inexpensive medical type head loupes and very bright light.  My fine tip soldering tip works well.  Go light on the solder. I tin the pads first and that is usually enough solder to do the job, and tomb stoning a resistor or cap is easy to break a circuit to add something to the circuit. Everyone should give it a try.  John, KC9ON, at swaps hands out little circuit boards with parts to make a sequential flasher from SMD parts as a practice kit.  It's a hoot and builds confidence. You can order them also from many eBay sites.

But then again, I have seen a few "ham fisted" hams build through hole kits and bungle up everything.  Sorry to say they went away sad as they could never get it, even with others help.  But they went back to old fashioned hamming with 100+ watts and SSB and are still making contacts while hams like me are pulling our hair out trying to get the latest kit working.  Ha!

Dave K8WPE

On Jul 25, 2018, at 9:40 PM, Jack Purdum via Groups.Io <jjpurdum@...> wrote:

I choked on getting it because I have never worked on SMT boards...

And therein is the problem...you haven't tried it. I'm two years younger than dirt and tried SMD's for the first time a little over a year ago. Like anything new, it takes a little practice, but it's really quite easy. Farhan uses large SMD's (1206's) and they are really easy to work with. I find a good set of angled tweezers and a magnifying headset and some confidence is all you need. Give it a try! After all, Custer took a chance...

Jack, W8TEE

On Wednesday, July 25, 2018, 7:17:03 PM EDT, Richard Spohn <wb2gxm@...> wrote:


Regarding the VK3YE...don't make it smaller.  I like Kees' AGC kit but
I choked on getting it because I have never worked on SMT boards and
just thinking about doing so makes me tired.  Having a through-hole
AGC kit is something I am interested in.  Don't make it smaller. -
Rich WB2GXM

On 7/25/18, Mvs Sarma <mvssarma@...> wrote:
> Nice . I suppose we could try to make it smaller
>
> regards
> sarma
> vu3zmv
>
> Regards
> MVS Sarma
>
>
> On Wed, Jul 25, 2018 at 9:43 AM, Nick VK4PLN <nickpullen@...> wrote:
>
>> Something I'm Working on...
>>
>>
>>
>>
>> 73 Nick VK4PLN
>>
>>
>>
>
>
>
>



Re: boosting the power on 28 MHz #ubitx

sp9tkw@...
 

Hi,

I've noticed strange behaviour after implementing this and Howard WB2VXW modifications - after 2-3 seconds of transmiting (key down) output power drops. Here are exact readings
80m - from 12W to 5W
40m - from 14W to 7.5W
20m - from 9W to 8.5W
15m - from 4.8W to 4.2W
10m - from 4W to 2W

My power supply is 12V 2.5A
Current drawn during transmit is 2.3A and does not drop after 2-3 seconds as power output.
I used standard SWR meter with 50Ohm dumy load to make the tests.
RV1 set at maximum power for tests

Other modifications which could potentially have impact
1. I have changed Q90 for 2N2222 initial transistor blown during startup, no idea why probably my lack of experience 
2. improvements to higher modulation

My knowledge is not sufficient to figure it out for myself, so any pointers what to check and change would be appreciated.

73
Marek de SP9TKW

Re: uBitx went POP. now very thing Audio and High SWR on TX.

Nick VK4PP
 

Thanks Raj.
It's ALIVE. Raj you were spot on, luckily I had a backup of the config, just reloaded it using KD8CEC uBitx manager...

All is well!

Re: si5351a CLK drive levels in uBITX #ubitx

VK3HN
 

I have several homebrew projects with Minicircuits diode DBMs and si5351 VFO/BFO/carrier oscillators.

I first tried si5351 clocks at all output levels via a 3dB 50 ohm pad into an SBL1 with unconvincing results. I seem to recall a scope on the clock pin showed significant loading when attached to the mixer LO port. 

I then inserted a 74HC04 squarer and a bigger pad with much better results, but it stops squaring at the higher end of HF. 

In my last build, a G6LBQ Bitx, I settled on a single stage 2n2222 common emitter buffer/amp (with broadband bifilar tapped (10T FT37-43) inductor) between the si5351 clock (running at 2mA) and an ADE-1, which gave good results. 
 
Just sharin', YMMV.  

Re: End Fed antennas w/ uBITX #ubitx

m5fra2@...
 

Exactly! Spending lots of money on wire antennas is IMHP stupid when you can make then for next to nothing. There is no magic involved.  If you are really interested don’t buy a 9:1 UNUN get an antennas analyser to see what is really going on.

 

Colin – M5FRA

 

From: BITX20@groups.io <BITX20@groups.io> On Behalf Of Warren Allgyer
Sent: 26 July 2018 00:39
To: BITX20@groups.io
Subject: Re: [BITX20] End Fed antennas w/ uBITX

 

Jerry

As I have said, it depends upon your definition of “work”. 

Using your 10 watt transceiver with this antenna is the same as using a 1 watt transceiver with a resonant half wave fed by a tuner or low loss transformer. I have made worldwide contacts using 1 watt. 

I just want want people to understand that they can do much better for a lot less money if they understand what is actually happening with their antenna. 

Almost any antenna will “work”. “Working well” can be easily achieved with a little bit of effort and our collective knowledge level can be improved at the same time. 

WA8TOD


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Re: VK3YE AGC pcb.

m5fra2@...
 

Just proves that us old timers can be modern!

 

Colin v- M5FRA

 

From: BITX20@groups.io <BITX20@groups.io> On Behalf Of Ralph Mowery
Sent: 26 July 2018 04:35
To: BITX20@groups.io
Subject: Re: [BITX20] VK3YE AGC pcb.

 

I started building when i was about 14.  I did not do any SMD untuil about 3 years ago and was 65 at the time.  Found a good microscope, and hot air rework station made the SMD very easy.  I would rather do it than the TH now.  Everything is about one one side, making it easy.

 

Just as anything else, it just takes a few good tools to do the job.  The first smd I did was a 2 meter preamp.  Tried it using some magnifying headsets and nearly burnt my nose off.

 

de ku4pt

 

 

On Wed, Jul 25, 2018 at 11:22 PM, Richard Spohn <wb2gxm@...> wrote:

>And therein is the problem...you haven't tried it.

I may not try it for awhile, Jack.  I love your books and I respect
your work greatly...and I respect your opinion greatly.   However...I
find TH construction relaxing and fun.  TH is part of my personal
approach to the hobby.  SMT is not yet, and may or may not be for
awhile.

(And I do still use rotary phones also)...73, Rich WB2GXM

On 7/25/18, Jack Purdum via Groups.Io <jjpurdum=yahoo.com@groups.io> wrote:
>  I choked on getting it because I have never worked on SMT boards...
>
>    And therein is the problem...you haven't tried it. I'm two years younger
> than dirt and tried SMD's for the first time a little over a year ago. Like
> anything new, it takes a little practice, but it's really quite easy. Farhan
> uses large SMD's (1206's) and they are really easy to work with. I find a
> good set of angled tweezers and a magnifying headset and some confidence is
> all you need. Give it a try! After all, Custer took a chance...
> Jack, W8TEE
>
> On Wednesday, July 25, 2018, 7:17:03 PM EDT, Richard Spohn
> <wb2gxm@...> wrote:
>
>  Regarding the VK3YE...don't make it smaller.  I like Kees' AGC kit but
> I choked on getting it because I have never worked on SMT boards and
> just thinking about doing so makes me tired.  Having a through-hole
> AGC kit is something I am interested in.  Don't make it smaller. -
> Rich WB2GXM
>
> On 7/25/18, Mvs Sarma <mvssarma@...> wrote:
>> Nice . I suppose we could try to make it smaller
>>
>> regards
>> sarma
>> vu3zmv
>>
>> Regards
>> MVS Sarma
>>
>>
>> On Wed, Jul 25, 2018 at 9:43 AM, Nick VK4PLN <nickpullen@...> wrote:
>>
>>> Something I'm Working on...
>>>
>>>
>>>
>>>
>>> 73 Nick VK4PLN
>>>
>>>
>>>
>>
>>
>>
>>
>
>
>
>
>
>
>
>


 


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Re: End Fed antennas w/ uBITX #ubitx

Warren Allgyer <allgyer@...>
 

The Principle of Resonance and The Principle of Standing Waves. Google them up. 

WA8TOD

Re: The dreaded LSB and USB swap problem again

W2CTX
 

If you have w0eb RadI2CinoI2C card why don't you try the firmware at www.woeb.com and see

if the lsb/usb issue goes away?

rOn

On July 25, 2018 at 10:50 PM "Jacob Farnes via Groups.Io" <kk6jtl@...> wrote:

When I sat down 3 weeks ago to figure the LSB/USB swap and offset out, I followed the following process. I had to follow Ian KD8CEC instructions on the frequency offset fix (actual setting name: "Master Calibration") and load the value via the memory manager.
http://www.hamskey.com/2018/05/how-to-calibration-ubitx.html

Using a RTL-SDR hooked to the Antenna port for a frequency counter for the internal RX measurement.

I then disconnected the two, put a dummy load on the uBitx, a VHF (SignalStick) antenna on the RTL-SDR and set them about 4-6 inches apart. Transmitted CW and took a reading using the various FFT of SDR# and fldigi.

I opened an Excel spreadsheet, labeled 3 rows for each of the Measurements, labeled the 4th "Offset" and punched in formula into the 4th row.

I opened the uBitx Memory Manager program, selected the correct COM port,
Opened the port,
read from the uBitx,
Decoded,
entered the offset value calculated,
Encoded,
Write to uBitx,
Close port.
Disconnect USB cable.
Turn off uBitx.
Turn it back on and check the frequency offset.

Repeat if off. It should be a check once process, but I'm using what I have on hand.

For whatever it's worth, my PPM calibration went fine, but when I that right my V2 uBitx has swapped LSB/USB. I went so far to debug the issue as swapping the Raduino with my Bitx40 as calibration is simpler. I'm able to get concrete PPM and BFO frequencies quickly out of the '40.
My original uBitx Radiuino had a PPM of 248. My Bitx40 had 17 ppm. W0EB was 38ppm. Calibrated quickly using amunters software.

So I plugged in my Raduino from W0EB with a known PPM of 38. USB & LSB were still swapped.

I even went as far as loading an EEPROM erase sketch since I had already messed up my stored settings.

Huh, so I know the problem is on the uBitx board. It's just not as obvious to me where.

Well I calculated out the offset as I think I was getting ready for field day. It about 50Hz off at the moment.

I had to set the offset aside in frustration for now. That's the steps and the relevant findings I had during the last attempt I made to find and solve the magical -2.4kHz VFO offset.

73 de Jacob AG7CT

Re: End Fed antennas w/ uBITX #ubitx

Jerry Gaffke
 

Hmm.
Which law of physics is that?


On Wed, Jul 25, 2018 at 10:16 PM, Warren Allgyer wrote:
Jerry, you have proven that the MyAntennas transformer is rubbish. 

The laws of physics do not allow an antenna system to present a 1.5:1 VSWR across three octaves without huge losses in the system. It simply cannot happen. 

Re: cw - paddle wiring question ...again

Kevin Rea
 

Yes.. I figured it all out.

Thanks.

Kevin

-----Original Message-----
From: BITX20@groups.io <BITX20@groups.io> On Behalf Of Raj vu2zap
Sent: Wednesday, July 25, 2018 10:08 PM
To: BITX20@groups.io
Subject: Re: [BITX20] cw - paddle wiring question ...again

Assuming it is a uBitx - did you solder the 4.7K resistor ?

Raj

At 26/07/2018, you wrote:
hi guys,
anyway, i put the resistors on the key jack as it shows in the picture.
when i send a dash or a dot, they are both the exact same length, they both
sound like a dot.

kevin

Re: End Fed antennas w/ uBITX #ubitx

Warren Allgyer <allgyer@...>
 

Jerry, you have proven that the MyAntennas transformer is rubbish. 

The laws of physics do not allow an antenna system to present a 1.5:1 VSWR across three octaves without huge losses in the system. It simply cannot happen. 

WA8TOD

Re: cw - paddle wiring question ...again

 

Assuming it is a uBitx - did you solder the 4.7K resistor ?

Raj

At 26/07/2018, you wrote:
hi guys,
anyway, i put the resistors on the key jack as it shows in the picture.
when i send a dash or a dot, they are both the exact same length, they both sound like a dot.

kevin

Re: End Fed antennas w/ uBITX #ubitx

Jerry Gaffke
 

A rubbish transformer is one that does not work.

I bought the myantennas.com EFHW8010 as described in the March 2016 QST review.
Works fine, antenna runs on 5 bands without a tuner at well under 1.5:1 SWR, 
and manages to radiate pretty much all the available power.
Cost was less than the price most would spend on a tuner.
Folks on the facebook page here:  https://www.facebook.com/groups/EndFedHalfWaveAntennas/
are attempting to duplicate this, but it's not easy.

I believe Warren tried building from instructions given on the facebook page
and found his unit did not work.

Jerry



On Wed, Jul 25, 2018 at 08:51 PM, Mark M wrote:
What is the difference between the 'rubbish' transformer and the proper one? Is it the toroidal version vs the binocular version? I've been considering putting together an EF antenna and I'd like to be sure not to build some rubbish. Can we relate this to the real world for those of us without EE degrees?

cw - paddle wiring question ...again

Kevin Rea
 

hi guys,
anyway, i put the resistors on the key jack as it shows in the picture.
when i send a dash or a dot, they are both the exact same length, they both sound like a dot.

kevin

Re: uBitx went POP. now very thing Audio and High SWR on TX.

 

Nick, looks like you upset the NANO settings. Try a reprogram and/or recalibrate
and see. BFO must be off..

Raj

At 26/07/2018, you wrote:
Well, what a night, just as I was finishing off the last bit of work on the radio, a new battery pack and fuses and connectors.

I decided, whilst I was listening to the radio, to switch over to the new battery. Now I did not use the off switch, just unplugged the Anderson from one battery and into the other.

POP, on it came, but the receive audio had changed. It had lost all of its punch, very empty and tinny, almost like i was running a 1khz filter or something.
I tried the TX and the power needle just straight to max and a high SWR too, that's with out speaking into the mic.

Strangely, it appears that CW TX is not effected... So?

So my initial thoughts are that I have jut blow the speaker? Nope, the TX is affected too...

Now I am thinking I have blown some of the front end mixer transistors... I know CW works different to SSB with regards to the mixers and such, ill look into that today and get a better understanding of what can be happening?

Radio still tunes and is on frequency, Just terrible thin RX audio and massive TX feedback/SWR.

Any thoughts?

Re: wiring up a cw paddle

Albert Woodhull
 

I did not want to rewire the straight key jack or add another jack for the paddle, so I made an adapter to go between the paddle plug and the straight key jack.  You need to connect the tip of the paddle stereo plug to the tip of the mono plug with 2.2K and the ring of the stereo plug to the tip of the mono plug with 10K.

See the picture attached:

Re: End Fed antennas w/ uBITX #ubitx

Warren Allgyer <allgyer@...>
 

Haha. Bless you for even trying read this entire mess. Much of it from me. 

Let me try  to boil it down to three bullet points:

1) The rubbish transformer loses 90% of your power on most frequencies. When used on a frequency for which the attached wire is a true half wave it only loses 20% of your power. The SWR however will be acceptable on almost all bands. 

2) A binocular core transformer can only be used on one band for which the antenna is a resonant half wave. On that band however it will lose less than 5% of your power. SWR will only be acceptable on this one band. 

3) A tuner can make any wire have acceptable SWR so long as the wire is at least a half wavelength long. This combination will lose 1 - 5% of power depending upon the quality of the tuner itself. 

For multiband operations only option 3 has performance that I would accept. For single band operations any of the 3 is OK with 2 and 3 preferred. 

Re: uBITX How to wire key jack for paddles?

Kevin Rea
 

Hi Kelly,
looking at your picture above of the resistors you are using, they do not seem to be the 2.2k, and the 10k, and 4.7k, did you modify yours ?

kevin

Re: uBITX How to wire key jack for paddles?

Kevin Rea
 

Hi Ashar,
in your previous message on this post you said, "from the key jack, a 2.2K to the dot padde, a 10K to the dash paddle"
where do they go on the other side of each resistor..Perhaps you could make a schematic ?

thanks,
kevin rea
lancaster, calif. usa

Re: End Fed antennas w/ uBITX #ubitx

Mark M
 

Forgive me, but I'm a little confused here, maybe moreso after reading the entire thread.

What is the difference between the 'rubbish' transformer and the proper one? Is it the toroidal version vs the binocular version? I've been considering putting together an EF antenna and I'd like to be sure not to build some rubbish. Can we relate this to the real world for those of us without EE degrees?

Mark AA7TA

On 7/25/18 8:21 PM, Warren Allgyer wrote:
i have not seen here anyone saying the EFHW antenna, even using the rubbish transformer does not work. ...