Date   
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

Re: uBix - transmit clicking when Mic inserted

Evan Hand
 

Jim,
I did go back and looked at your pictures, and from what I can see there it appears that you have wired the jacks correctly.  Can you send us pictures of how you have the plugs wired?  The external PTT switch is wired correctly, however to verify that it is working do you have an ohm meter to test that the switch does open and close?  It looks like you have the switch directly wired into the circuit, bypassing the mic/PTT jack.  That is OK, as long as it is working correctly.

Also, can you explain when you hear the relays clicking?  Is it when you turn the rig on with or without the mic plugged in?  Does it click only when you plug in the mic? Do the relays appear to drop out after clicking? Do they click when the PTT switch is pressed after the first click on insertion or power up?

To test without blowing your finals, only power the RED wire in the 3 wire power plug.  That is the Red positive 12v and black ground/the return of the 12v.  Do not power the brown wire.  You can then power and test the rig without actually transmitting.  The rest of the rig is powered up and can be used.  That should really be in the "startup" process, to make sure you have the receiver (and since the same VFOs are used) the transmitter aligned before going on the air.

FYI,
It is hard (at least for me) to give you accurate suggestions without getting very detailed information from you. If you can describe the actions and observations being clear on the order of occurrence, it helps me understand both what is going on as well as your understanding of what you are observing.  If this is viewed as condescending, I apologize.  I am simple minded, so often miss the obvious.

73
Evan
AC9TU

Re: Signalink wire up

Gordon Gibby <ggibby@...>
 

Been using mine for WINLINK digital for well over a year.   Even installed a RJ 45 socket.  Just yesterday at the Georgia ARES meeting was using it as a client station


On Jan 13, 2019, at 12:44, "mcouncil@..." <mcouncil@...> wrote:

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

Re: Signalink wire up

Gordon Gibby <ggibby@...>
 

On Jan 13, 2019, at 12:44, "mcouncil@..." <mcouncil@...> wrote:

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

Re: Signalink wire up

Gordon Gibby <ggibby@...>
 

I have also used it to do automatic link establishment, AL E— using PC ALE


On Jan 13, 2019, at 12:53, Gordon Gibby <ggibby@...> wrote:

https://qsl.net/kx4z/DigitalConnections.pdf





On Jan 13, 2019, at 12:44, "mcouncil@..." <mcouncil@...> wrote:

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

Re: Signalink wire up

Curt
 

Mike

Indeed you can use whatever connectors you can fit onto the case, including that db9 on the back of Sunil's case, if that is what you refer to. Note many commercial rigs use a round connector, they are just pins. Gordon's use of rj45 sounds intuitive,  since that is what in on the signal link end.

Oh yes, yesterday wired 3 relays on a board that Gordon designed to reduce harmonics. Using his writeup, I just need to resolve that I need to attach the control wires to the anodes of those diodes on the main board. We are also adding a 45 MHz filter stage on the other end of the bidirectional amplifier in our club build.

73 Curt

Re: Signalink wire up

Green Hills
 

Gordon, many thanks. I will use a short length of CAT5 and run it all from the mic plug on the front. I have 3 out of the 4 connections used for the mic. Adding a speaker connection to pin 4 will let me use the same receptacle for a mic cable and a Signalink cable.

73, Mike

Re: Signalink wire up

Gordon Gibby <ggibby@...>
 

Yes, that’s a very slick way to do it!!!

Congrats, just be sure not to overdrive.


On Jan 13, 2019, at 14:41, "mcouncil@..." <mcouncil@...> wrote:

Gordon, many thanks. I will use a short length of CAT5 and run it all from the mic plug on the front. I have 3 out of the 4 connections used for the mic. Adding a speaker connection to pin 4 will let me use the same receptacle for a mic cable and a Signalink cable.

73, Mike

Re: Mini PA für my uBITX #ubitx

DC3MS
 

Thank you for the reminder Jerry.

You are right, no question about that. 

Easy to "forget" the discussion about ubitx signal quality.

 

 

Re: Tracing receive signal for low signal

Dave Space
 

I was actually able to get the audio preamp onto a perfboard with solderpads... first time I tried that seems a bit annoying when the pads don't connect to anything just the individual components.
I think I have to find some perfboards that have a layout more like breadboards to make that easier for me perhaps. Bending leads and solder bridges work but seem like I could easily not get everything soldered right.

I have to do some more tests but the signal is very strong at vol high maybe 160mv+ with 100uV in to the antenna.  I need to see if I can measure and reduce the input voltage to see what I can really get the voltage down to and still hear at an s9 or hear at all.  

Re: Harmonics and Relay Replacement

Nick VK4PP
 

"If it smells like chicken, you're holding it wrong!"

Ubitx v4 for sale

jamesfholland@...
 

I am selling a ubitx v4 unassembled, just as received when purchased it. I simply don't have the time to build it.

I am auctioning it off on ebay.
https://www.ebay.com/itm/HFSignals-uBitx-microBitx-v4-transceiver-kit-unassembled/163479080437

Thanks,
James
KG5UGN

Re: Mini PA für my uBITX #ubitx

Bob Lunsford <nocrud222@...>
 

I confused "spur" with "harmonic." I see your point, though.
Thanks for making me, and possibly others, to think more
about the real culprits.

Actually, an amp is not really necessary because more
is achieved by a proper antenna and more antenna work.
Major problem is that many people do not turn up the gain
on their receivers and once this is done, the QRP rig is
usually heard. The next consideration is some other station
that is nearby that runs high power and covers up the QRP
signal.

It's ll part of the QRP World. I remember days of the HW-7 and
HW-8 and the experience gained there. QRP is more than a
simple technique, though. It's pickled with patience.

Bob — KK5R

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

On Sun, 1/13/19, Jerry Gaffke via Groups.Io <jgaffke=yahoo.com@groups.io> wrote:

Subject: Re: [BITX20] Mini PA für my uBITX #ubitx
To: BITX20@groups.io
Date: Sunday, January 13, 2019, 11:34 AM

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.

Re: Harmonics and Relay Replacement

Nick VK4PP
 

Hi All.

Just wondering, With the new LPF board I'm working on, how do people feel about having the ND6T agc integrated on the board as well?

I think there is enough space to fit it in there and still maintain the same footprint of the existing LPF section.

Thoughts?
73 Nick VK4PP

Ubitx v4 whining and swr check issue(?)

BK
 

Hi all, newbie here
Just got ubitx v4 last dec2018, installed and connected to my endfed half wave thru 3:23 ratio balun (or un-un?).

Once i powered up i notice "whining" issue which at 40m band it heard around 3-4khz (checked with spectroid) which from another thread looks like this issue will be fixed by replacing the nano board.

Once i calibrated it (to strong broadcast band) and set bfo setting, i can hear local ham band properly, with addition of the "whining".
Playing around the frequency dial, i notice that the whining change (louder) when i dial down below 7.000.050. Means 7Mhz and below had different whining sound compared to 7.000.050 and above

Well as my ordered nanos are on it's way, i set the cw key to straight key, and use that to check my antena swr. Antena was built with 20m long insulated wire(halfwave of 40m band), which theoretically should give me lower freq than 7mhz. I checked with my swr meter (and ubitx cw) and found that it dipped somewhere around 6.5mhz. Okay, i shorten the wire and test again. Playing the frequency up and down to find the new dip giving me surprise as when i reach 7.000.050 and above it gave me very high swr.

I again check 7.000.000 and below. It gave me low enough swr but when i dial 7000.050 and above the swr get very high. 

This similar with my finding on the whining issue, that 7.000.050 number seem magical. This raise question :

Is ubitx limit the tx to be only on ham band?

If so, this may justify that below 7mhz i got low swr due to "no" tx power applied, cmiiw.
I haven't check the firmware (v4.3) to see what happened on 7.000.000 vs 7.000.050. If someone can give me hints, that'd be welcomed.
Thanks for any help and sorry for my english.

Re: Ubitx v4 whining and swr check issue(?)

_Dave_ K0MBT
 

I got a used ubitxv4 that had that sort of a whine. Turns out the BFO was off about 2k. Go through the setup and start with the standard bfo freq of 11.9965mc, then adjust from there.

Maybe you have the same problem.

Re: Ubitx v4 whining and swr check issue(?)

Bob Lunsford <nocrud222@...>
 

Hello. Here is my ham information and at the bottom, you can see
details of an End Fed Dipole that has worked for me. I have made
many of them but the way you place the coax is important. Check
it out:

https://hamcall.net/call?callsign=kk5r

Bob — KK5R

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

On Sun, 1/13/19, <budi.krisnawan@...> wrote:

Subject: [BITX20] Ubitx v4 whining and swr check issue(?)
To: BITX20@groups.io
Date: Sunday, January 13, 2019, 8:11 PM

Hi all, newbie here
Just got ubitx v4 last dec2018, installed and connected to
my endfed half wave thru 3:23 ratio balun (or un-un?).

Once i powered up i notice "whining" issue which
at 40m band it heard around 3-4khz (checked with spectroid)
which from another thread looks like this issue will be
fixed by replacing the nano board.

Once i calibrated it (to strong broadcast band) and set bfo
setting, i can hear local ham band properly, with addition
of the "whining".
Playing around the frequency dial, i notice that the whining
change (louder) when i dial down below 7.000.050. Means 7Mhz
and below had different whining sound compared to 7.000.050
and above

Well as my ordered nanos are on it's way, i set the cw
key to straight key, and use that to check my antena swr.
Antena was built with 20m long insulated wire(halfwave of
40m band), which theoretically should give me lower freq
than 7mhz. I checked with my swr meter (and ubitx cw) and
found that it dipped somewhere around 6.5mhz. Okay, i
shorten the wire and test again. Playing the frequency up
and down to find the new dip giving me surprise as when i
reach 7.000.050 and above it gave me very high swr.

I again check 7.000.000 and below. It gave me low enough swr
but when i dial 7000.050 and above the swr get very
high. 

This similar with my finding on the whining issue, that
7.000.050 number seem magical. This raise question :

Is ubitx limit the tx to be only on ham band?

If so, this may justify that below 7mhz i got low swr due to
"no" tx power applied, cmiiw.
I haven't check the firmware (v4.3) to see what happened
on 7.000.000 vs 7.000.050. If someone can give me hints,
that'd be welcomed.
Thanks for any help and sorry for my english.

Re: Ubitx v4 whining and swr check issue(?)

Evan Hand
 

The stock software for the uBitx does cut the VFO so that there is not any RF out.  There is a check on the VFO setting below 7.000,000.1 to shut it down on transmit.  I have not checked on where the band change to the next lower band, however it does turn back on at some point.  I am not at a terminal where I can review the code to let you know the exact frequency.

73
Evan
AC9TU

Re: Ubitx v4 whining and swr check issue(?)

BK
 

This whining is always there even if i disconnect the antenna so i believe this is not corelate to bfo (and yes i have set the bfo properly).

When i touch around the ubitx board, nothing i touch changes the sound, but when i touch 25mhz crystal pin it does change the sound of the whining. Other than that is by moving the frequency to 7mhz and below. Anyhow thanks for the reply. Today i installed cec firmware v1.08, and do the same test around 7mhz. The same symptoms still there:
-7mhz and below makes my swr low and thw whining sound increase in volume (and or in freq)
-7.000.050 and above make my swr very high. 
I think i need an oscilloscope to see more of what happened.