Date   

Re: BITX QSO Afternoon/Evening, Sunday, July 15, 3PM & 7PM Local Time, 7277 kHz in North America, 7177 kHz elsewhere.

James Lynes
 

Heard N2CQR calling CQ once around 7:32 EDT here in WCF. Then faded into the ether...

James
KE4MIQ


Re: uBitX for sale

Ryan Benteman AD0TZ
 

Sold.  


Re: Q70 replacement

Kevin Rea <reakevinscott@...>
 

Here on eBay.
https://www.ebay.com/itm/100-x-2SC945-C945-BIPOLAR-TRANSISTORS-NPN-TO-92-50V-USA-SELLER-Free-Shipping/323210926653?epid=1113025015&hash=item4b40df5a3d%3Ag%3A6MkAAOSwBahVT88a&LH_PrefLoc=1&_nkw=2SC945&_from=R40&rt=nc


Re: receive works great, but no trans power, #ubitx-help

Bo Barry <wn4ghv@...>
 

Please post the link to the guide again. Tnx Bo W4GHV 


Re: Ubitx version 4.3

Jerry Gaffke
 

Enormous bandwidth?
Are you using this rig mostly for CW?
It is primarily designed for SSB use, CW is an afterthought.
The crystal filter is around 2khz wide, as required for SSB use.
The easiest solution for CW would be to add an external filter between headphone jack and headphones.

There are updates to the the firmware should solve the keying issue for you, check out the KD8CEC firmware.


On Mon, Jul 16, 2018 at 08:22 AM, p.gould1@... wrote:
Hi all.
Just received and built the latest ubitx, and have encountered a couple of seeming problems.
It is all wired up according to specification.
First problem is that there is little or no audio on rx , and the sidetone volume is fine
Secondly that when using straight key the first key down isn't recognised, there is a pause then a dash before it catches up with what is being sent,
Resulting in corrupt call signs etc. it's ok then as long as I don't pause in sending!
And hopefully and lastly the bandwidth of the received stations are enormous so if trying to contact them , where to put the frequency is a matter of guess work.
Hope this makes sense, and the answer is simple enough for my grey cells to contemplate.
Best regards
Paul......M6FEU


Ubitx version 4.3

p.gould1@...
 

Hi all.
Just received and built the latest ubitx, and have encountered a couple of seeming problems.
It is all wired up according to specification.
First problem is that there is little or no audio on rx , and the sidetone volume is fine
Secondly that when using straight key the first key down isn't recognised, there is a pause then a dash before it catches up with what is being sent,
Resulting in corrupt call signs etc. it's ok then as long as I don't pause in sending!
And hopefully and lastly the bandwidth of the received stations are enormous so if trying to contact them , where to put the frequency is a matter of guess work.
Hope this makes sense, and the answer is simple enough for my grey cells to contemplate.
Best regards
Paul......M6FEU


Re: receive works great, but no trans power, #ubitx-help

Don - KM4UDX
 

Clark & Jerry -- thank you for the guidance! 

I think I'm getting in over my head here. I'll try some more basic debugging, but if I can't figure it out, I may have to put it in the dump and call it a "lesions learned" experience.

The ratio of working/communicating is getting way too high. I'm sadden that so many other uBitx folks are working the world, but I can't get out of my workbench. sigh. 

Don


Re: #bitx40help #radiuno #bitx40help #radiuno

g3srq@...
 

Read all the posts with interest...Just waiting for my uBITX to arrive....Thanks Guys....Ray G3SRQ/F5VKX


Re: Q70 replacement

R. E. Klaus <reklaus@...>
 

Used to use a lot of them in repairing audio gear in the 80's and 90's. We got them from MCM Electronics then. Probably discontinued now, so probably have to get them off Amazon or eBay. Google shows several returns for them.
 


Re: Q70 replacement

M Garza <mgarza896@...>
 

I would look at old 10 & 11M equipment.  The NTE equivalent is a NTE 85.

Good luck,

Marco - KG5PRT 


On Mon, Jul 16, 2018, 9:42 AM Jer Tres <ownselv@...> wrote:
Where does one get a 2SC945?


Re: Q70 replacement

Jer Tres
 

Where does one get a 2SC945?


Re: New file uploaded to BITX20@groups.io

Allen Merrell
 

Thanks Michel, I don't have my smeter together yet but I think I can fix this problem pretty easy. It should go all the way out to the +20, did you calibrate your s meter using Ian's procedure?  I will definitely check into it. I need to get s meter together. I thank you for bringing this to my attention.
--
Allen  Merrell


Re: Q70 replacement

Tom Cooper
 

With RX voltage of 13.6, the Q70 collector voltage is 4.67 on the 2sc945.

I should mention that I added a 16K resistor from the base to ground when Q70 was a 2n3904, which was suggested by W3JDR to reduce distortion.  I did not remove that resistor.

73,

Tom  W1EAT


Re: receive works great, but no trans power, #ubitx-help

Jerry Gaffke
 

Yes, an RF probe is a good idea to have around when debugging a uBitx.

That looks like a reasonable circuit, but good luck finding a GEX66.
Seems to be a germanium point contact diode from 50 years ago, meant for UHF,
5v max reverse voltage.
I'd just use a Schottky diode such as the 1n5711 or a BAT54*.
And maybe adjust those cap values, 100pf at the input seems low for under 100mhz. 

See this post, and the thread around it.
    https://groups.io/g/BITX20/message/52563

Jerry



On Sun, Jul 15, 2018 at 09:47 PM, Clark Martin wrote:
Build yourself an RF Probe such as at: http://www.qsl.net/g3pto/probe.html.  You can use it to trace the signal (or lack thereof) through the transmit path.
 


Re: uBitX for sale

Ryan Benteman AD0TZ
 

Its back on the market!  


Re: Raduino fix leads to no receive uBitx #radiuno #ubitx

ludwig_t@...
 

Hi Gordon,

I measured mine without any load and I had way too low output level on CLK2 and CLK1. It was a bit dependent from the frequency I tune in. Then I modified the code in the ubitx_si5351.ino inreasing the drive of the clock outputs. The DC voltage supply for the SI5351 supplies 3.3V, so there seems to be no problem.

I measured now with a HP54510A oscilloscope which has a greater bandwith than the Philips PM3335 analog scope I used before. I also used better oscilloscope probes to measure. Now I get 1.26Vrms when I tune on 10m band and 1.85Vrms on 80m. This should be okay. Now my receiving noise is also a bit louder on all bands but I still not receive any SSB Signal.


Re: New file uploaded to BITX20@groups.io

Michel Dupuy
 

Hello Allen. Very good the file for the Nextion 35 B. I noticed a small problem: The S / Meter never exceeds the S9 even on a very QRO signal. It looks like it's stuck at S9. Thank you for the work.
Michel F1GTX


Re: error in memory manager

Mike Woods
 

Mike

UBitx Manager is intended for use with CEC firmware, not the factory default firmware.  It cannot connect to the default factory firmware, as the manufacturer does not include any handlers to respond to UBITx Manager!

Don't worry though, the CEC firmware won't change the settings you have entered in calibrating your txcvr.  You can do a back up the first time you connect to CEC firmware.

73

Mike ZL1AXG

On 16/07/18 11:58 AM, Mike KK7ER wrote:
When I try to use uBITX Manager Ver 0.11 with COM port set to 38400-N-8-1, the Raduino crashes and shows "db>4000000" which I assume mean that it has dropped into its micro debugger.  :-(  This is with factory default firmware which displays "uBITX v4.3" and "USB A:14.252.550" at startup.  I was hoping to use uBITX Manager to back up the current settings before trying CEC firmware.  Any ideas?
--
Mike Woods
mhwoods@gmail.com


Re: receive works great, but no trans power, #ubitx-help

Clark Martin
 

Build yourself an RF Probe such as at: http://www.qsl.net/g3pto/probe.html.  You can use it to trace the signal (or lack thereof) through the transmit path.


Clark Martin
KK6ISP

On Jul 15, 2018, at 8:54 PM, Don - KM4UDX <dontAy155@...> wrote:

I watched a bunch of youtubes, and tested the IRF510s with my DVMM.  They flow only one way between two pins, so they appear good. And the voltage on the pins is close to expected values. So I have to assume the problem is BEFORE the finals, or the signal that tells them to get going on TX is not there?  Oh wise ones, guide your lowly student to the light......

I'm going to follow the TX Quiescent Testpoings, Group3, then Group2 and finally group 1, based on the very nice "Diagnostic Guide" by Ufi Auttorri, May 16, 2018. 

My fear is that the values will be fine, so the problem is something stupid that I've done. Which is typical. I'm just saying. 

Thoughts or shortcuts much appreciated...
_._,_._,_


Re: HDMI display

Arv Evans
 

Mike

HDMI would imply that the rig has a video output, which is not the case.  uBITX transceivers
come with a 2-line LCD display, but many have modified theirs to use 4-line LCD or various size
Nextron displays.  Non of these have traditional video output that would be able to drive a
video monitor. 

Since you are playing with the Raspberry Pi which does have video you might be interested to
know that your Raspberry Pi can talk to the uBITX using rig-control software via the USB/TTL
interface.  This gives you graphical control over the uBITX with the Raspberry Pi supporting
traditional video output.

There are alternative software packages available for the uBITX that do support enhanced
functions such as rig control and larger non-video displays.

Arv  K7HKL
_._


On Sun, Jul 15, 2018 at 10:00 PM Mike Short <ai4ns.mike@...> wrote:
New here, waiting on my ubitx to arrive. I have been reading the postings, and was wondering about HDMI display support. I have been getting to know the rpi and it has HDMI support. Is HDMI possible with the ubitx?

Mike AI4NS