Date   

Call sign format for WSPR

David Birnbaum
 

The line "For callsigns such as mine, consisting of 5 characters, I must enter a space character as the first
character in order to satisfy these callsign rules." should be in bold for next revision. 

Missed that and couldn't get WSPR working.

dave
k2lyv


Re: QCX+ IQ Balance, AF Gain

Arv Evans
 

It seems that with a dual-trace scope one would be able to see relative levels and relative phase
offset between I and Q, or at the summation of the two.  This looks like an opportunity for someone
to write an article on phase shift balancing using various readily available test equipment.

Arv
_._


On Sat, Jul 25, 2020 at 12:49 PM Theo <theotheo36@...> wrote:
I'm at a complete loss for where my fault could be. I've followed the debugging guide here with both an oscilloscope and DVM and everything seems to be as expected. I just can't make any adjustments to IQ Balance, Phase Lo, or Phase Hi, by turning the trimmers. Does anyone have any ideas where to look?


Up-to-date QCX+ tips as of July 25, 2020 #qcx+ #enclosure #manual #case

Ham Radio
 

While waiting for my QCX+ to arrive, I am collecting a list of items to check.

1. R46 is indeed 10K
2. JP7 trace needs to be cut (does not effect normal operation)
3. When soldering the connectors on the back of the PCB,  use the back panel as an alignment template for a nice fit
4. Detailed troubleshooting guide is found in QCX manual

Anything else for the list?
--
73, Bernie, VE3FWF
(most typos in this message have been generated by highly sophisticated auto-correction software)


Completed QCX+ build

Ron Jones
 

Just completed QCX+ 40 meter build, works great. build went well, except for T1, and I added a couple of mods, a speaker and internal batteries.
45 volts p to p with 15.7 source voltage (before diode)
Thanks Hans for a great kit.

Ron
W9RCJ



W9RCJ


Re: QCX+ IQ Balance, AF Gain

Theo
 

I'm at a complete loss for where my fault could be. I've followed the debugging guide here with both an oscilloscope and DVM and everything seems to be as expected. I just can't make any adjustments to IQ Balance, Phase Lo, or Phase Hi, by turning the trimmers. Does anyone have any ideas where to look?


Re: Clock Kit.

Chris Wood
 

Hello Ken

If it's any consolation, I have the same issue.  Data burst audible (and visible on the waterfall) on VHF air band down to 20m at least.  Not evident on 2m but I have a high noise level there.  Usually I'm on 40 or 30 so I only noticed it during the recent Es on 10 and 6.   Disconnecting yellow and green LEDs made no difference for me either.  

My QLG-1 (internal patch aerial in a plastic box) plugs into a hub (in an ali case), which provides 9v and 5v from an external 12v supply, and connects 4 5-pin DIN sockets in parallel (Gnd, 5v, 1PPS, Data, 9v), so GPS into one, Progrock, Clock and one spare for something else. 

I also have a separate clock and Progrock in a portable case with 6v SLAB, into which I can also plug the QLG-1, so I've been able to move this unit around the shack.  No external power leads, just the lead between the GPS and the main box.  The interference is reduced as I move away from the operating position, but is still audible when 6 to 8 feet away.

For now, I unplug the GPS from the hub if I want to use an affected band, which isn't that often.  The clock time is ok, but if I forget and leave the GPS unplugged overnight, the date doesn't change and I end up putting the wrong date in my log!

Maybe I'll do a bit more investigation when I have some time and I'll be interested in what others may have to suggest.

Chris  G4CWS


Re: Clock Kit.

N3MNT
 

I use one OLG-1 for several of my QRP_Labs radios. I connect them to the radios with one of two cables One had 4pin female headers on each end and one has  4 pin header and a DB-9 connector on the other,  For the DB-9 I cut an unused serial cable so there is a nice shield while the header to header is using 4 conductor phone wire.  The phone wire does introduce some noise ( pulses with the 1pps) however there is no interference when using the shielded DB-9 cable.  Might provide some insight.


Re: QCX+ build notes

Sheldon Hartling
 

Thanks, Ben.

Great idea.  I caught this just in time for my QCX+/40M build.  I posted pictures to the Facebook group in my post about the ‘quite fiddly’ QCX+ front panel assembly.

73, Sheldon VE1GPY


Re: Clock Kit.

KEN G4APB
 

Hi Bill, Hans,
thanks for the replies. I was curious of your setup Bill, I expected you to say the opposite!

I also run my gps units from their own analogue supplies. I even built my own analogue ‘rf friendly’ psu so I knew what was in it. 
I have disconnected my leds (no effect on interference), and put so much capacitance and series resistor filtering on the outputs that the U3s could not decode the data anymore (but still got the interference). The only thing that works is to disconnect the 9600 baud DATA line from the gps end and that gives maximum reduction in noise but rather defeats the issue. I have a switch now that disconnects that line to my U3S once CAL has been achieved whenever I want to receive with reduced background noise.
Strangely, I can run a marine NMEA receiver at 9600 baud with long leads, no special screening to a nearby PC with no interference issues at all, so I don’t understand why the gps modules give me so much grief.


Re: Resistor for qcx+ code? #40m #manual

Gregg Myers
 

I mistakenly called R46 function as a pull-up, but I look again and it looks to be used as a voltage divider for differentiating which button is pressed. Not enough coffee yet, I guess. Anyway, carry on!

73,
Gregg

On Sat, Jul 25, 2020 at 9:29 AM Evan Hand <elhandjr@...> wrote:
Gregg is correct, my prior post was for R45, which is not the resistor that is missing for you.  As Gregg stated, R46 should be a 10K resistor.

I have deleted my prior post so has not to cause anyone else confusion.

I apologize for the error on my part.
73
Evan
AC9TU


Re: Resistor for qcx+ code? #40m #manual

Evan Hand
 

Gregg is correct, my prior post was for R45, which is not the resistor that is missing for you.  As Gregg stated, R46 should be a 10K resistor.

I have deleted my prior post so has not to cause anyone else confusion.

I apologize for the error on my part.
73
Evan
AC9TU


Re: Resistor for qcx+ code? #40m #manual

Alan G4ZFQ
 

A 10k has ( br-bl-bl-rd-br ) from what I add up.  It there supposed to be a 1k or 10k installed?
Darren

Colour codes are difficult to be absolutely certain of.
In doubt (nearly always!) I measure.
My guess is you have a 10K 2%. $ figures, tolerance.

73 Alan G4ZFQ


Re: Resistor for qcx+ code? #40m #manual

Gregg Myers
 

Hi Darren,

R46 is supposed to be a 10k resistor. It's function is a ‘pull-up’ resistor and these are commonly 10k. It is also listed as 10k in the schematic.

Good luck,
Gregg W7GRM

On Sat, Jul 25, 2020 at 9:12 AM Darren KN4WML <darrent78@...> wrote:
I have a question about the installation manual, hopefully some others have run into this issue. On page 80  (3.59) of the manual, it says to install the 10K resistor R46. I didn't have one in the contents of the kit but when I cypher the color codes it shows me a 1k resistor. (Brown-black-black-brown-red).  A 10k has ( br-bl-bl-rd-br ) from what I add up.  It there supposed to be a 1k or 10k installed? Luckily I have a few kits of resistors....      

Thanks
Darren
KN4WML


Resistor for qcx+ code? #40m #manual

Darren KN4WML
 

I have a question about the installation manual, hopefully some others have run into this issue. On page 80  (3.59) of the manual, it says to install the 10K resistor R46. I didn't have one in the contents of the kit but when I cypher the color codes it shows me a 1k resistor. (Brown-black-black-brown-red).  A 10k has ( br-bl-bl-rd-br ) from what I add up.  It there supposed to be a 1k or 10k installed? Luckily I have a few kits of resistors....      

Thanks
Darren
KN4WML


Re: QCX+ IQ Balance, AF Gain

Hans Summers
 

Hi all

Yes, as Paul says... the "JP7 problem" is a very minor thing. It does not affect anyone using a QCX in the most normal kind of way. Just building it and using it. The "JP7 problem" is just a deviation from my declared intention of how the JP (pairs of pads at 0.1-inch spacing) are to be used - in so far as I intended that you could break the signal path by carefully cutting the trace between the two pads, and then use a jumper wire or connector for later repair, or for connecting to the Dev board for alternative experimental circuit blocks etc. So the "JP7 problem" is very minor indeed and does not affect ordinary operations. 

I have already corrected the trace in my PCB layout and so when I next manufacture a batch of boards, that change will be included. 

73 Hans G0UPL
http://qrp-labs.com

On Sat, Jul 25, 2020 at 5:02 PM m0bmn via groups.io <m0bmn=yahoo.co.uk@groups.io> wrote:
The only problem with JP7 is that it cant easily be cut for isolation if your trying to fault find,  this track problem will not in itself cause any problem other than that. for those that haven't built the QCX+ the word 'Jumper ' is a little misleading, there are no jumpers on the QCX+ , each JP'x' point is a break point to help with fault finding, they are a solid PCB track with a cut point if needed, once cut then a link can be fitted between the the two points on the circuit board  given a reference JP'x'.
it is most unlikely that there will be a break on the PCB between JP points if the builder hasn't cut the track themselves.
the biggest help for me was to use the trouble shooting guide on Hans site, with a low value resistor across R43 i could see the signal on my little scope and follow it through the the receiver till i found i had a small short on two tracks. it will be a harder task without a scope, the other way i tested it at each stage was with a old crystal eaphone, one end to gnd and the other to a probe which i could move around, it has about 20 Mohm impedance so didn't upset anything, a big help if you haven't a scope.
good luck, its a great radio when you get it finished so stick with it.
73 Paul M0BMN
 


Re: #20m #qcx #20m #qcx

Hans Summers
 

Hi Syd

The QCX+ and QCX have the same circuit, same firmware, same operational characteristics. Just the components are in different physical places. All the troubleshooting guides for QCX still apply to QCX+:

I should make this clear in the documentation and web pages but have not got around to it yet. There is so much to do and so little time to do it in! 

73 Hans G0UPL
http://qrp-labs.com

On Sat, Jul 25, 2020 at 5:31 PM Syd via groups.io <nhuq1=yahoo.com@groups.io> wrote:
The new  QCX+ assembly manual is quite complete. A real good document.  I noticed that for the QCX version there was a troubleshooting manual, so I guess that this same manual will apply to the QCX+ version also as I cannot find any such item for the QCX+ version.


#20m #qcx #20m #qcx

Syd
 

The new  QCX+ assembly manual is quite complete. A real good document.  I noticed that for the QCX version there was a troubleshooting manual, so I guess that this same manual will apply to the QCX+ version also as I cannot find any such item for the QCX+ version.


Re: #20m #qcx wrong picture #20m #qcx

Syd
 

found the updated version
73
wt1v


Re: QCX+ IQ Balance, AF Gain

m0bmn
 

The only problem with JP7 is that it cant easily be cut for isolation if your trying to fault find,  this track problem will not in itself cause any problem other than that. for those that haven't built the QCX+ the word 'Jumper ' is a little misleading, there are no jumpers on the QCX+ , each JP'x' point is a break point to help with fault finding, they are a solid PCB track with a cut point if needed, once cut then a link can be fitted between the the two points on the circuit board  given a reference JP'x'.
it is most unlikely that there will be a break on the PCB between JP points if the builder hasn't cut the track themselves.
the biggest help for me was to use the trouble shooting guide on Hans site, with a low value resistor across R43 i could see the signal on my little scope and follow it through the the receiver till i found i had a small short on two tracks. it will be a harder task without a scope, the other way i tested it at each stage was with a old crystal eaphone, one end to gnd and the other to a probe which i could move around, it has about 20 Mohm impedance so didn't upset anything, a big help if you haven't a scope.
good luck, its a great radio when you get it finished so stick with it.
73 Paul M0BMN
 


Re: KIT LPF WITH THE 5 RELAYS

KEN G4APB
 

In the standard configuration described in the assembly manual, the LPF kit inserted on the right (in position 1) is ALWAYS in-circuit and should be the filter for the highest frequency band installed. However, this is not suitable for when you wish to use the kit to switch band pass filters Or, LPFs without going through position 1 every time.

To switch band pass filters, use the jumper configuration shown below. 

Note that the output SMA connector(s) on the right side of the board are connected permanently to the final (position 1) filter output. Therefore you cannot use them as the output, when using the board for Band Pass filter kit switching. In this case you should take the RF output from the connections circled in yellow, in the diagram. The RF input is the RFI pin of the 2 x 5-pin header on the left of the board (same as in the Low Pass Filter kit usage). An alternative is to cut the track from the SMA connector center pins and add a wire to connect it to the common bus track that runs horizontally across the board, finishing at the "RF" pad circled in yellow.