Date   
Re: uBitx V4 test point measurement chart #ubitx #ubitx-help

 

Ted,

Just uploaded into files section RC RX/TX voltages without modulation. See files \ VU2ZAP folder.

Power supply adjusted to 12.0V during RX and TX.

Hope it helps!

Cheers
Raj

Re: New file uploaded to BITX20@groups.io

 

There is also an older format XLS file in the folder if required.

https://groups.io/g/BITX20/files/VU2ZAP/uBitx4%20voltages.xls


On Sun, Jan 13, 2019 at 12:31 PM, "BITX20@groups.io Notification" <BITX20+notification@groups.io> wrote:

Hello,

This email message is a notification to let you know that a file has been uploaded to the Files area of the BITX20@groups.io group.

File: uBitx4 voltages.xlsx

Uploaded By: Rajendra Kumar G G <rajendrakumargg@...>

Description:
DC voltages TX/RX uBitxv4

You can access this file at the URL:
https://groups.io/g/BITX20/files/VU2ZAP/uBitx4%20voltages.xlsx

Cheers,
The Groups.io Team

Re: Mini PA für my uBITX #ubitx

DC3MS
 



Right, the module seems to be sold by many different sellers in asia. Dont expect to get documentation or service, they just sell it.

The boards are named "XF-P100" and "XF-LPF-HF".  

I am not promoting these modules as the amp can be changed to whatever you like, i just wanted to control it via i2c using Arduino.


@Timothy : I have tried to run in on 24V and my Zetagi HP500 showed  90W output with 5W drive. Given the MRF186s specs, wheres the catch ?

 

 

 

Re: Mini PA für my uBITX #ubitx

DC3MS
 

Thank you Timothy.

Heres a link : https://www.ebay.com/itm/Assembled-LPF-low-pass-filter-90W-SSB-CW-AM-RF-HF-power-amplifier-HAM-RADIO/121965988356?hash=item1c65bd4a04:g:2kgAAOSwFxBXHHYO:rk:3:pf:0

 

Re: Mini PA für my uBITX #ubitx

Timothy Fidler
 

Reply : Some of the photos I have seen have marginal looking  OPTs on them as in things that look like longitudinally split core coaxial cores.

2.  THe fully assembled versions will have a heat sink based on something like 30 W dissip most likely.  When you look at the MRF 186 specs it is rather in efficient so 
heat,  when it is run at 90 W out continuously could be a real problem.  A modern mosfet RF Amp will be nominally 60 percent eff in class B but NOT this one.

3. Some of the units have a power supply capacitor that is marginal at 24 V supply. - It can be changed out - in fact the Ozzie Wordpress article may have mentioned that.

apart from that , no issues !  PS it would be fascinating to find out how so many of these VHF gemini pairs got left in a sack in PRC prior  to their being repurposed for current use  - I guess they were intended for some military project that was canned or a better device (higher efficiency) was found and these ones went begging.??

Re: Mini PA für my uBITX #ubitx

Bob Lunsford <nocrud222@...>
 

Got more options with an eBay search...
https://www.ebay.com/sch/i.html?_from=R40&_trksid=m570.l1313&_nkw=HF+Power+Amplifier+For+FT-817+IC-703+SUNSDR2+PRO+KX3+QRP+Ham+Radio&_sacat=0

Bob — KK5R

--------------------------------------------

On Sun, 1/13/19, Timothy Fidler <engstr@...> wrote:

Subject: Re: [BITX20] Mini PA für my uBITX #ubitx
To: BITX20@groups.io
Date: Sunday, January 13, 2019, 12:56 AM

https://www.ebay.com/itm/90W-HF-Power-Amplifier-For-FT-817-IC-703-SUNSDR2-PRO-KX3-QRP-Ham-Radio/182056979298?hash=item2a63710b62:g:d~UAAOSwP~tW6cCQ:rk:13:pf:0

this vendor is top-cc* in
Shanghai - never used him  - this is simply answering the
question.

There is probably
only one mafr down in a tin shack somewhere in PRC and these
legions of resellers.  He quotes it as  90 w Module which
is bollocks. 

NB no LPF
with this incarnation. some other vendors of the same
basic  PCB have an LPF but it is the single relay for both
in and out type - as per what the MX-P50 uses.

Re: Mini PA für my uBITX #ubitx

Bob Lunsford <nocrud222@...>
 

A consideration here is to wonder if any spurs, etc., get
amplified with the amp. May need more LPF's to keep it
within FCC specifications. Just a thought.

Bob — KK5R

--------------------------------------------

On Sun, 1/13/19, DC3MS <mark.schraven@...> wrote:

Subject: Re: [BITX20] Mini PA für my uBITX #ubitx
To: BITX20@groups.io
Date: Sunday, January 13, 2019, 2:58 AM



Right, the module seems to be sold by many
different sellers in asia. Dont expect to get documentation
or service, they just sell it.
The boards are named "XF-P100" and
"XF-LPF-HF".  
I
am not promoting these modules as the amp can be changed to
whatever you like, i just wanted to control it via i2c using
Arduino.


@Timothy: I have tried to run in on 24V and my
Zetagi HP500 showed  90W output with 5W drive. Given the
MRF186s specs, wheres the catch ?

Re: uBitX v4.3 calibration

Vic WA4THR
 

Playing more with the uBitX, currently “breadborded” (wired up with alligator clip jumpers) on the desk. I found that it is going into transmit during the calibration phase, and that appears to be intentional. In other modes the PTT switch acts normally. I tuned my main rig to 10mHz and, watching the pan adaptor screen, I moved the apparent uBitX carrier up to zero beat the frequency, alternating listening on USB and LSB, and now it seems right on frequency. Then I played a little with the BFO and it is sounding better. They really should change the instructions on the website as I have never heard that this is the way it is supposed to be done and that seems odd for a new or impoverished ham who would not likely have another rig with SSB capability to listen to.

I plan to play around in this temporary hookup and probably load the CEC sketch and see about converting the display. Then the big question of whether I start modifying the rig for spurs and harmonics or wait for the v.5 board.

=Vic=

Re: Bitx40 #bitx40help #bitx40

Vic WA4THR
 

With the Raduino otherwise disconnected, can you plug its USB port into a USB line from your computer or a cell charger? That will power it up on 5v and you can see if it is displaying and acting normally to see if it has any issues from being misswired.

=Vic=

Re: uBitX v4.3 calibration

EI4GNB
 

I was baffled by this too. All a bit strange.

For uBitx V 4.3 calibration Here's what i did:

Change band to 20m, attach a dummyload, or a decent antenna for 20m, with a low SWR. Use Your frequency counter, then start the calibration routine - the radio will key up , then adjust so Your frequency counter reads bang on 20mhz.

After You do this, Things will be fall into place i suspect, including the BFO problems i bet You are having.

Yes, i know. This sounds wrong, but i could NOT get my uBitx to behave predictably until i did this. I actually thought i had fried it it was so unstable and off-frequency, then i did the calibration thing, but with the radio on 20m, and it all fell into place.

Re: Mini PA für my uBITX #ubitx

DC3MS
 

The heat dissipation on 24V really is high - i stick to 13.8V and 30W on the meter.

The PA is still to be analyzed regarding spurs - this is going to be done in the near future.

 

uBix - transmit clicking when Mic inserted

Jim Miller
 

Hello everyone,

I've sent several messages in the past asking about why my uBitx clicks (relay) as if it's trying to transmit when I connect a mic to the jack.  I've even sent some images of how I have it wired up and as best as I can tell I have it wired up correctly (search for previous posts).  I've also tried using the little button mic that comes with the kit and have the same issue.  

At this point, I don't know what else to do so I'm going to ask if there's an Elmer out there who'd be willing to be a 2nd pair of eyes and confirm that either there's an issue or I'm an idiot (the latter is more likely).  I'd be glad to pay shipping back and fourth (I'm in St.Louis, MO).

Thank you,
Jim Miller
AE0BZ

Re: uBix - transmit clicking when Mic inserted

 

Jim,

If the mic connector is common with PTT then I suggest you try switching the PTT and mic contacts.

Raj

At 13-01-19, you wrote:
Hello everyone,

I've sent several messages in the past asking about why my uBitx clicks (relay) as if it's trying to transmit when I connect a mic to the jack. I've even sent some images of how I have it wired up and as best as I can tell I have it wired up correctly (search for previous posts). I've also tried using the little button mic that comes with the kit and have the same issue. Â

At this point, I don't know what else to do so I'm going to ask if there's an Elmer out there who'd be willing to be a 2nd pair of eyes and confirm that either there's an issue or I'm an idiot (the latter is more likely). I'd be glad to pay shipping back and fourth (I'm in St.Louis, MO).

Thank you,
Jim Miller
AE0BZ

Re: uBix - transmit clicking when Mic inserted

_Dave_ K0MBT
 

That is what happens to all three of my ubitx radios. The work around that I have used is to not plug in mic when turned on.

Welcome from N.E. Mo.
73
Dave

Re: uBix - transmit clicking when Mic inserted

Jack Purdum
 

Listen to see if the xmit relay is cycling. Take a paper towel tube and place it over each relay to determine if one is cycling. If so, look on the schematic to see what that relay controls.  If it's tied to the PTT circuit, the mic is probably wired incorrectly.

Jack, W8TEE

On Sunday, January 13, 2019, 10:21:41 AM EST, Jim Miller <stljim@...> wrote:


Hello everyone,

I've sent several messages in the past asking about why my uBitx clicks (relay) as if it's trying to transmit when I connect a mic to the jack.  I've even sent some images of how I have it wired up and as best as I can tell I have it wired up correctly (search for previous posts).  I've also tried using the little button mic that comes with the kit and have the same issue.  

At this point, I don't know what else to do so I'm going to ask if there's an Elmer out there who'd be willing to be a 2nd pair of eyes and confirm that either there's an issue or I'm an idiot (the latter is more likely).  I'd be glad to pay shipping back and fourth (I'm in St.Louis, MO).

Thank you,
Jim Miller
AE0BZ

Re: uBix - transmit clicking when Mic inserted

Doug W
 

Do you have the keyer jack wired up?  If not do you have a 4.7k resistor between pins 2 and 3 of the radiuno?
--
www.bitxmap.com

SolderSmoke Podcast #209

Bill Meara
 

Re: Bitx40 #bitx40help #bitx40

Mike Short
 

No display, I guess I toasted it.
i will try one from one of my ubitx 

Re: Mini PA für my uBITX #ubitx

Jerry Gaffke
 

More than just a thought.

Here's another:  a LPF won't cure the spurs, they can be lower in frequency 
than your fundamental.    With the mike gain cranked up as some do to get 
sufficient power out on the high bands, spurs can be 20x stronger (or worse)
than even the rather lax -43dbc spec of our beloved FCC.

The uBitx is marginal at best with regards to spurs and harmonics and IMD and residual carrier.
Excusable on a QRP rig perhaps, but I wouldn't slap a linear on it unless I had the gear
to verify that the uBitx had been modded sufficiently to have a clean signal.
 
On the other hand, I guess all those FCC guys are out on leave these days ....

Jerry


On Sun, Jan 13, 2019 at 02:43 AM, Bob Lunsford wrote:
A consideration here is to wonder if any spurs, etc., get
amplified with the amp. May need more LPF's to keep it
within FCC specifications. Just a thought.

Signalink wire up

Green Hills
 

uBitx with upgraded 2.8 Nextion is done and seems to be working. I will try to transmit & receive after I get an appropriate antenna. Thanks to all who helped this first timer get something that at least lights up.

I want to dedicate the rig to do Winlink Express with a Signalink. My research has shown the Signalink needs ground, PTT, Mic and Speaker. So it seems I should be able to connect these (from the mic and speaker) to the unused D9 plug on the back of the case and build the correct pinout to the Signalink. So before I release the magic white smoke please give me your opinion/experience in my plan.

OMG, if the financial business had a user group like this one I would be rich and retired on the beach, instead of 11" of snow in Missouri.

73, Mike