Date   
Re: Which manual do I use?

George Korper
 

The important change is in the new firmware. The other changes are  much less significant. I print manuals but using the PDF in my smartphone is much easier to read
placement of components. My smartphone is actually my main radio and the QCX is a project, and very absorbing but shouldn't become a talisman. Neither should my smartphone. They are both gadgets and the process is learn ing. Not things. 

 MADAM,  please return my coat, I think I've had one too many radios. 

On Thu, Jan 9, 2020, 5:54 PM wb8yyy via Groups.Io <wb8yyy=yahoo.com@groups.io> wrote:
Lee

the probability is high the kit will match the board.  also I think I member you have lots of building experience.  and the few changes, Hans would tell you himself - but I think you will receive the latest version in hardware. 

another QCX?  if you built one - you know the ropes.  yes with my eyesight the laptop was a 'Godsend' allowing me to match where each part went on the board - but do what works for you. 

please remember the folk at 'the factory' are quite busy - we should be thrilled they provide enjoyment to us.  let's see we have exceptional e-commerce, manual that is off-the-charts good - and a wonderful rig.  please don't fret they can't respond more quickly - we have collectively gotten vast attention. 

73 and enjoy the journey

fellow builder Curt wb8yyy

Re: MSF or DCF clock module instead of GPS

Alan Jones <oalanjones@...>
 

Andy and Steve,
Thanks for your input.
I will give it a shot and order an antenna from amazon.
Thanks for the picture!

Alan, N8WQ

On Thu, 09 Jan 2020 18:29:07 -0500, Steve MW0KST <stevedavies77@...> wrote:

Alan,

As others have said, it’s just a cheap active GPS antenna from Amazon. Cost about £10. 


It needs 5V fed up the coax. The shack end of the coax is attached to a home made antenna cut from PCB, with 5V fed to the coax inner side. It’s a bit rough, but does re-radiate the signal into the shack.


73, Steve


_._,_._,_

 

Re: Which manual do I use?

@CurtisM
 

Lee

the probability is high the kit will match the board.  also I think I member you have lots of building experience.  and the few changes, Hans would tell you himself - but I think you will receive the latest version in hardware. 

another QCX?  if you built one - you know the ropes.  yes with my eyesight the laptop was a 'Godsend' allowing me to match where each part went on the board - but do what works for you. 

please remember the folk at 'the factory' are quite busy - we should be thrilled they provide enjoyment to us.  let's see we have exceptional e-commerce, manual that is off-the-charts good - and a wonderful rig.  please don't fret they can't respond more quickly - we have collectively gotten vast attention. 

73 and enjoy the journey

fellow builder Curt wb8yyy

Re: MSF or DCF clock module instead of GPS

Steve MW0KST
 

Alan,

As others have said, it’s just a cheap active GPS antenna from Amazon. Cost about £10. 


It needs 5V fed up the coax. The shack end of the coax is attached to a home made antenna cut from PCB, with 5V fed to the coax inner side. It’s a bit rough, but does re-radiate the signal into the shack.


73, Steve


Re: QCX 50 Watt PA what is the max current for 50 watts.

ajparent1/KB1GMX
 

What in the spec made you assume that.  The manual is the arbiter as
its how to assemble the amp.  At 85ma bias you will get lower power as your
starting to depart from class C into class AB1 at lowered efficiency.

Typically the QCX (at 40m) will do 3-4W easily.  The 20M version a little less.

Playing with the attenuator is possible if your qcx is weak. Do try to not overdrive
the amp as you will get excess power and likely failures.  The attenuator as
explained in the manual does two things 3db (approximately 1/2) cut in power
and also insures the QCX sees a reasonable 50 ohm match.

Q: what current at 20V are you drawing at 45W out?  Stay under 4A
for longevity.  NOTE: if T3 is backward it is possible to force near 50W
but its inefficient and has increased heating.

Do check the number of turns on L4 and L3 as some require one less for
optimum power.

Allison
-------------------------------
Please reply on list so we can share.
No direct email, it goes to bit bucket due address harvesting in groups.IO

Re: Which manual do I use?

Simon Kennedy
 

Some would say that you were being too hasty in not waiting until you received the kit but as yours has been shipped from the US you will get it quicker than if it had been shipped from Turkey, so small mercies etc!

You need to look at Section 10 Document Revision History, p145.

I really don't think you've got any reason to reprint the manual if you get a Rev 4 board. You will have an additional capacitor to install (C39) but that's all.


On Thu, 9 Jan 2020, 22:52 Leland L. Bahr, <w5drc@...> wrote:

Your comments  have nothing to do with my concerns or tell me something I do not know.

Lee, w0vt

On 1/9/2020 4:50 PM, N3MNT wrote:
Most people build from assy instructions on a laptop or tablet.  The board rev should be on the board you receive.  If it was shipped from the US warehouse, you should have it in a matter of days.  These are the changes so no need to reprint entire manual.

Re: Which manual do I use?

ajparent1/KB1GMX
 

Myself I'd hold printing till I see it but, the REV5 is the shipped unit.

Do review the web page as there is both history and dates outlined
as well as what changes each rev adds.

The reason you got a suggestion to work from the screen over paper
is any changes or fixes (including documentation) are often incorporated
very quickly to the on line sources.

 I've built a few bits of QRPL gear and the web page is the reference
not here.  Though we have a lot of good people here that have built
them as well.  I really like the QCX I have.

Allison
-------------------------------
Please reply on list so we can share.
No direct email, it goes to bit bucket due address harvesting in groups.IO

Re: Which manual do I use?

Leland L. Bahr
 

Your comments  have nothing to do with my concerns or tell me something I do not know.

Lee, w0vt

On 1/9/2020 4:50 PM, N3MNT wrote:
Most people build from assy instructions on a laptop or tablet.  The board rev should be on the board you receive.  If it was shipped from the US warehouse, you should have it in a matter of days.  These are the changes so no need to reprint entire manual.

Re: Which manual do I use?

N3MNT
 

Most people build from assy instructions on a laptop or tablet.  The board rev should be on the board you receive.  If it was shipped from the US warehouse, you should have it in a matter of days.  These are the changes so no need to reprint entire manual.

Which manual do I use?

Leland L. Bahr
 

I decided to buy another QCX-40.  I live in the US.  I ordered the radio on Jan 1.  I downloaded REV-5 Manual Jan 7.  I got a shipment notice the radio was shipped from the US on Jan 8.  No shipping info nor any serial number given.  Just that it was shipped from the US.  I recently read QCX boards were out of stock and not expected to be available again until the middle of January.  So that is what I know.  My concern is which manual do I use to build the radio once it gets here?  Will I get a Rev-4 or Rev-5 board?   I would hate to think I need to throw away the Rev-5 manual and have to reprint 9 zillion pages for a Rev-4 manual for a radio I have not yet received.  If I had known about all this, I would not have printed out the BIG Rev-5 manual and had it bound until I knew which manual to download.  Personally I think communications are poor!
Lee, w0vt

Re: 4 line display for qrplabs clock

Roy Edens
 

Thanks to all who responded to my request on 4 line display .

Re: Anyone have a dead QCX with a good receiver?

Andrea Massucco IZ1IVA
 

Nevermind, it's now stopped booting altogether.

I've first tried Hans' recommended fix (moving L5) but that didn't work, then snapped one leg of L5 without having a spare one. After much cursing I hoped G3JRH's fix could save the day (I have a small supply of Schottky diodes), but no.

Either my QCX is haunted or my solder is ageing causing issues around the circuits. I really can't think of other plausible reasons for these behaviour and I'm starting to think it'll be far easier for me to assemble a new QCX than troubleshooting this one.
--
73 de Andrea IZ1IVA - cq at iz1iva . net - http://iz1iva.net

Re: QCX 50 Watt PA what is the max current for 50 watts.

harleyleenuke
 

Allison,
I assumed by reading the IFR510 specs.  that I should add about 85 ma.  

 I re-performed the adjautment last night with about the same results.  
 

That got me thinking.  I have the qcx powered with 12 volts.  The qcx is putting out about 2 watts.   I adjust the qcx voltage up to 13 volts.The power out was 3 1/4 watts.
 I then connected the PA and my output was about 45 watts.

I was just following Hans suggested setup,  placing the qcx at 12 volts.   

With the PA attenuator envolved,  That must really knock the QCX down alot.  So maybe the amp is working ok.
 If I modify the attenuator for 2 watts input from the qcx @ 12 volts, then that may correct the issue





Re: 4 line display for qrplabs clock

N3MNT
 

I used this and works great. 
https://www.amazon.com/gp/product/B00GZ6GK7A/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1

Re: Anyone have a dead QCX with a good receiver?

Alan G4ZFQ
 

The alignment tone is strong enough to pierce whatever roadblock there is, not so real radio signals.
Andrea,

But I was thinking if the radio was 30dB down then 30dB lower tones might be noticed. But I have never tried.. Some form of signal tracing might help, a scope or diode probe. I think troubleshooting suggests a lower value for R43 for the early stages.

Late 2017, but it developed this issue only very recently.
A dry joint can take a while to show up.

73 Alan G4ZFQ

Re: Anyone have a dead QCX with a good receiver?

Andrea Massucco IZ1IVA
 

Il giorno 09 gen 2020, alle ore 16:56, Alan G4ZFQ <alan4alan@...> ha scritto:

Are they really as strong as described in the manual?
They definitely are.

The tone signal is fed into the input of the LPF, there is not much between that and the antenna socket.
True, but there are many stages after that HI! I’d say the core of the receiver, the many op-amps, etc. Lots and lots of components and solder joints…
The alignment tone is strong enough to pierce whatever roadblock there is, not so real radio signals.

How old is it? This sort of fault was rectified very early in the life of the QCX. Look at the mods page, maybe something is faulty on one of the pins that power the micro.
Late 2017, but it developed this issue only very recently.

Cheers
--
73 de Andrea IZ1IVA - cq at iz1iva . net - http://iz1iva.net



--
-- 73 de Andrea IZ1IVA - cq at iz1iva . net - http://iz1iva.net

Re: Anyone have a dead QCX with a good receiver?

Jim Manley
 

Many thousands sold per year ... just wait until the QSX hits the street ... the total number of views for the QSX page is now over 1.1 MILLION!!!  OK, that's not views by unique visitors, and half of the views have probably been by me because I check the page every time someone mistypes QSX in a post/message, to make sure I didn't miss an announcement, but, still ... 


Jim  KJ7JHE
Lame Deer High School Amateur Radio Club  KJ7JKU


On Wed, Jan 8, 2020 at 9:52 AM ajparent1/KB1GMX <kb1gmx@...> wrote:

From what I know literally many thousands are sold per year.  Last announcement last year
the number of units crossed 8000.  Unlikely to be in the same lot.

Re: Anyone have a dead QCX with a good receiver?

Alan G4ZFQ
 

I wonder what would happen if it were faulty, open or short circuit, what would be the symptoms? I'm not an expert but I think either way all that would happen is that the filter would not be so effective.
In my case I can barely hear signals which in reality are pretty strong, and that’s with maxed-out gain… and a quiet room HI!
Andrea,
I would not think that C17 would do that but maybe I'm wrong.

I did A-B comparisons with another radio and the same antenna, I’d say signals are down a good 30+ dB. On the other hand, alignment tones are loud and clear.
Are they really as strong as described in the manual? The tone signal is fed into the input of the LPF, there is not much between that and the antenna socket.

My QCX was working perfectly before, only recently has developed this fault, plus the microcontroller isn’t starting anymore when first powered on (cold boot). I’m really puzzled!
How old is it? This sort of fault was rectified very early in the life of the QCX. Look at the mods page, maybe something is faulty on one of the pins that power the micro.

73 Alan G4ZFQ

Re: Anyone have a dead QCX with a good receiver?

Andrea Massucco IZ1IVA
 

Il giorno 09 gen 2020, alle ore 11:53, Alan G4ZFQ <alan4alan@...> ha scritto:

I agree, however Vern wrote he had to replace C17 in both his faulty QCXs… it could be a coincidence, but what are the odds of that?
One could ask why no-one else has reported that problem?
That’s true Alan, I’m not even trying to draw conclusions based on a sound statistical basis. However, I found it interesting that Vern found exactly the same faulty component on two QCXs and I was wondering if that could help me fixing mine.

I wonder what would happen if it were faulty, open or short circuit, what would be the symptoms? I'm not an expert but I think either way all that would happen is that the filter would not be so effective.
In my case I can barely hear signals which in reality are pretty strong, and that’s with maxed-out gain… and a quiet room HI!
I did A-B comparisons with another radio and the same antenna, I’d say signals are down a good 30+ dB. On the other hand, alignment tones are loud and clear.

My QCX was working perfectly before, only recently has developed this fault, plus the microcontroller isn’t starting anymore when first powered on (cold boot). I’m really puzzled!
--
73 de Andrea IZ1IVA - cq at iz1iva . net - http://iz1iva.net



--
-- 73 de Andrea IZ1IVA - cq at iz1iva . net - http://iz1iva.net

Re: 4 line display for qrplabs clock

jjpurdum
 

Ron, Jim:

Terry King has a bunch of Arduino-related stuff as well as displays:



While not the cheapest, he has lots of info about what he sells and sample code you can use to experiment with. His 20x4 displays are about $10, but support the I2C interface so they use fewer I/O pins. Plenty of info on it if you're not sure about I2C (which is supported by the Arduino family of processors).

While perhaps not the cheapest stuff on the planet, you'll be supporting someone who stands behind what they sell and genuinely wants to be helpful.

Jack, W8TEE




On Wednesday, January 8, 2020, 11:02:27 PM EST, Ron NR8O <ron.rollinson@...> wrote:


Jim,

If you have the time, you can get these pretty inexpensively out of China. I've ordered a couple and they work and look great. Do a search for '20x4 lcd module'. You can sort by price, low to high, or even specify if you want to buy from a seller in the U.S.

73,
Ron NR8O