Date   

Re: VERY large QRP labs lot on Ebay

Jim Manley
 

Thanks James!

This would be terrific for my high school ham club, so if others could refrain from bidding this up, the students, along with my non-union, non-tenured STEM teacher wallet would greatly appreciate it!

I don't understand why everyone hasn't already figured out that bidding more than 10 - 15 seconds before an auction ends (depending on how fast your Internet connection is) only results in rabid bidding-up of prices beyond any level of common sense.  For some, it becomes an addictive, obsessive "game", even getting into vengeful and retributional territory, especially if someone's been outbid by a perceived "enemy" before.

Appreciate it and  

Jim  KJ7JHE
Lame Deer Montana High School Amateur Radio Club  KJ7JKU


On Sun, May 24, 2020 at 7:35 PM James R. Chastain via groups.io <suenrod=yahoo.com@groups.io> wrote:
I was thinking about bidding on this but it would be a waste for me. I thought someone in the group might be interested.

https://www.ebay.com/itm/Huge-Lot-QRP-LABS-Kits-Components-Shield-Accessories-As-Pictured-WSPR-GPS/143611313799


Re: 50W QCX Amplifier DC Power Source

George Korper
 

Excellent. 


On Sun, May 24, 2020, 8:15 PM John Morris <k7rld@...> wrote:
Reg,
I got my 50W amp finished and it is working well with the authentic HP Power brick. No noise with this one.
HP Model: Model PPP012H-S
19v @ 4.74amps
Very little drop under load.

73's


Re: QCX+ with speaker

Steve in Okinawa
 

I’ve always used a little plugin MP3 type powered stereo speaker and almost always the batteries go dead when i am in the field. Trystan suggested that some miniature speakers are sensitive enough to use without an amplifier so i tested a few and found them all almost inaudible. But a sonic resonator (aka toilet paper tube) can be tuned to near 700 Hz and boosts the sound output to nearly the level of that battery powered device. 


VERY large QRP labs lot on Ebay

James R. Chastain
 

I was thinking about bidding on this but it would be a waste for me. I thought someone in the group might be interested.

https://www.ebay.com/itm/Huge-Lot-QRP-LABS-Kits-Components-Shield-Accessories-As-Pictured-WSPR-GPS/143611313799


Re: 50W QCX Amplifier DC Power Source

John Morris
 

Reg,
I got my 50W amp finished and it is working well with the authentic HP Power brick. No noise with this one.
HP Model: Model PPP012H-S
19v @ 4.74amps
Very little drop under load.

73's


Re: Fuse settings question

Arv Evans
 

Scott

There are a number of on-line tools that will help you set the fuse bits.






If you are going to change the fuse bit settings you probably need to read 
over the section on fuse bits in the datasheet that is for your specific 
device.  While there are minimal interaction (I think) between fuse settings,
if done improperly it is possible to make your microcontroller into a "brick"
that can no longer be programmed using normal methods.  If you accidentally 
do this there is still the so-called "high-voltage programming" method that 
uses 11 to 12 volts on the RST pin and will allow you to recover from a total 
lockout of all programming capability.

I hesitate to give very specific information on programming because your 
programmer, your connected hardware, and your microcontroller may be 
different from those that I have worked with.  There is adequate on-line 
information to support you learning just what is needed and to implement 
that solution.

Arv
_._



Arv
_._


On Sun, May 24, 2020 at 5:38 PM Scott - N1ST via groups.io <n1st=yahoo.com@groups.io> wrote:
http://www.crash-bang.com/programme-avr-fuse/

Arv, is that to say that _9 erases the EEPROM when the chip is flashed?


Re: QCX S/W 1.04, PCB Rev 5, 40M Band : Looking for a diagnostic insight #40m #qcx

ed.j.tink@...
 

Wow! Thanks Allison for the quick reply. I will get back to you tomorrow (I am in the eastern time zone.)

I confirmed continuity several times the  (T1)  band pass filter's primary to secondary 3 and secondary 1 through secondary 2 as on page 10 of the troubleshooting guide.

I did find and correct one issue where I had not cut the feet of Q7 short enough an one pin was in contact with the underside of R36.

Talk to you soon.

Thanks,

Ed


Re: Fuse settings question

Scott - N1ST
 

http://www.crash-bang.com/programme-avr-fuse/

Arv, is that to say that _9 erases the EEPROM when the chip is flashed?


Re: QCX+ with speaker

ajparent1/KB1GMX
 

Trystan,

Yes the Opamp can push out a few milliwatts.  On a noisy windy location
outdoors its not enough, in my lab ok.  Helps if there is a 32 ohm to 8ohm
matching transformer, that actually helps some but not a great amount.

That and yes there are others that do no appreciate CW [what's beeping?]!

Allison
-------------------------------
Please reply on list so we can share.
No private email, it goes to a bit bucket due address harvesting


Re: QCX S/W 1.04, PCB Rev 5, 40M Band : Looking for a diagnostic insight #40m #qcx

N3MNT
 

Many time unstable readings when adjusting Pots are caused by poor connections ( insulation on wires) at T1.


Re: QCX+ with speaker

ajparent1/KB1GMX
 

Jim Netwal,

Let me help you.  The QCX plus is the same design as QCX different mechanical
layout but same circuit.  Hans has said this, maybe you didn't read it.

So that being the case it behaves exactly the same and generally the QCX is a
headphones radio.

Can the box fit a speaker, yes.  You will have to make an audio power amp up
so it can drive a speaker.  There is room enough for that too.

Allison
-------------------------------
Please reply on list so we can share.
No private email, it goes to a bit bucket due address harvesting


Re: No TX, No RX, no LCD #chat

ajparent1/KB1GMX
 

As Fred said some of the ICs use 3.3V, some 5V and a few 12-13V

Likely cause is IC11 voltage regulator in backward or a short from pins 1 to 3.
POOF, happens then.

The parts that do not like more than 5V (give or take 10%):
Microprocessor, (5V max)
SI5351 NPLL (3.3V)
FST3253 (5V)
74ACT00 (5v)

Soldering in the 5351 and FST3253 is SMT tech and if you skills are not up
to it try it, or build another as lack of SMT removal skills will generally
destroy the board..

Allison
-------------------------------
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No private email, it goes to a bit bucket due address harvesting


Re: QCX S/W 1.04, PCB Rev 5, 40M Band : Looking for a diagnostic insight #40m #qcx

ajparent1/KB1GMX
 

The audio system is DC coupled so any error always start at the input and
progress to the first error point.  If the voltages are off it will not work well.

With a common every day multimeter measure the junction of R1 and R2.
It should be 2.5V (pllus or minus a small amount).

IF not make sure the right resistors were inserted and check soldering.

IF Good then test pins 7 and 9 of IC4, if the same as the first measurement (2.5V) your good.
If not solder the leads of T1.

Go to pins 2,3,5,6 if IC5, the voltages should be exactly the same to the limits of
your meter (+-1 digit).

IF good then proceed, if not check your assembly, likely soldering.

Check IC 5 pins 1 and 7 they should be the same votlage and around 2.5V.

IF not are, same dance check your work and soldering.

IF they are we can talk later.

One last thing make sure no resistors are resting against another part,
no solder whiskers causing a short.

Also make sure the Volume pot, three leads actually connect to the board!

Enough for a start.  No scope needed yet.

Allison
-------------------------------
Please reply on list so we can share.
No private email, it goes to a bit bucket due address harvesting


Re: QCX+ with speaker

Trystan G0KAY
 

As I said, "Incidentally, some miniature 2" and smaller speakers have a sweetspot (free air resonance) at 700Hz and incredibly sensitive."

In other words, you do not need an amp if you want to run an internal speaker. I'm listening to a station, on my QCX, no amp, into a 40mm speaker and I have my volume turned down a lot otherwise it would be far too loud. The QCX as it is has plenty of audio gain. 


Re: Fuse settings question

chmims <chmims@...>
 

Thanks for the info.  I ran the command and now hfuse set to 0xD1.

73 Charles KG5ZLH


QCX S/W 1.04, PCB Rev 5, 40M Band : Looking for a diagnostic insight #40m #qcx

ed.j.tink@...
 

I recently completed assembling a QCX for the 40m band and have an issue with audio amplification. Polling to see if anyone may have some advice where to specifically look.

The digital, LCD and transmit sections appear fully functional. The device draws about 110 ma at 12.13 V on receive and 470 ma at 12.09 V measured at the power supply.

For adjustment and alignment, I get two peak BPFs at 28 bars and 08 in the top left (2^8 * 28 = 7168) but the I-Q balance, Lo and Hi Phase are bouncing between 00 and 01 -- obviously in the noise level. I can hear the respective 700, 600, and 800 Hz tones but they are very, very faint at full gain.

Once (out of many power ups) the audio worked as expected. The tones were loud, I adjusted the I-Q balance and the Lo Phase to minimums (around 9 and 7 I think) but the volume dropped off again when I got to the Hi Phase adjustment.

I was very meticulous and systematic about sorting the parts, triple checking part locations and I also went through the "General checklist" in the (very well done) QCX Troubleshooting PDF. In the interim, I am trying to locate/acquire an oscilloscope in order to continue troubleshooting.

Cheers,

Ed

I have to locate an oscilloscope, however, any insights would be very much appreciated.







Re: Fuse settings question

Arv Evans
 


On Sun, May 24, 2020 at 12:59 PM Alan G4ZFQ <alan4alan@...> wrote:
>'How do I permanently change the H fuse to D1
> from D9?'

Charles

As I posted last week https://groups.io/g/QRPLabs/message/46807

##*Write fuses NOTE not normally required, only if values read are not
correct!*
C:\A>avrdude -u -c usbasp -p m328p -P usb -B 0.5 -U lfuse:w:0xF7:m -U
hfuse:w:0x
D1:m -U efuse:w:0xFC:m

Really I guess that -U hfuse... is all you need but the full command
will do no harm.

73 Alan G4ZFQ




Re: Fuse settings question

Alan G4ZFQ
 

'How do I permanently change the H fuse to D1 from D9?'
Charles

As I posted last week https://groups.io/g/QRPLabs/message/46807

##*Write fuses NOTE not normally required, only if values read are not correct!*
C:\A>avrdude -u -c usbasp -p m328p -P usb -B 0.5 -U lfuse:w:0xF7:m -U hfuse:w:0x
D1:m -U efuse:w:0xFC:m

Really I guess that -U hfuse... is all you need but the full command will do no harm.

73 Alan G4ZFQ


Re: Fuse settings question

Charles Mims <chmims@...>
 

I guess I need to rephrase my original question 'How do i prevent this from happening again?'  to 'How do I permanently change the H fuse to D1 from D9?'

Charles
KG5ZLH


On Sun, May 24, 2020 at 1:54 AM Alan G4ZFQ <alan4alan@...> wrote:
> This CQX 20 hat been been revived after using avrdude  to install
> T1.05.hex and T1.04.eep.
>
> This command  % avrdude -u -c usbasp -P usb -B 0.5 -U hfuse:r:-:h -U
> lfuse:r:-:h -U efuse:r:-:h'
> returns Fuses OK (E:FC, H:D9, L:F7

Charles,

Yes, the chip is not bricked.
But unless the H fuse is changed to D1 it will need the .eep file for
the next update.

73 Alan G4ZFQ




Re: No TX, No RX, no LCD #chat

fred.g3srf@...
 

If you do indeed have 13 volts on all IC's, then you have found your fault. You may as well just order a new kit as you will have problems replacing all the IC's that don't like excessive voltage applied and that is pretty well all of them.

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