Date   

Re: QCX-mini update 30-Sep-2020

Ted 2E0THH
 

Just have to have one.
It is a beautiful looking radio, deciding the band will be the hardest part.
My QCX is 40m so will probably opt for the 80m, oh decisions...

73s Ted

2E0THH


Re: QCX-mini update 30-Sep-2020

Trystan G0KAY
 

Hans,

How exiting! It's something we can all look forward to. If I'm not one of the lucky first thousand, then I'll have time to enjoy the anticipation of waiting for it when the second batch is made. 

Trystan
G0KAY


Re: QCX+ on 6M?

Hans Summers
 

Hi Razvan

QCX, QCX+ and QCX-mini are all the same circuit and same firmeare. Whatever mods are needed for 6m apply equally to all three. 

After relevant changes to LPF, T1 (BPF) and Class E load (L4)... still expect lower TX power output (1-2W) and lower RX sensitivity (needs a pre-amp).

73 Hans G0UPL 

On Thu, Oct 1, 2020, 23:22 DL2ARL <dl2arl@...> wrote:

WoW! QCX and 6m sounds great! How about the old QCX? Does the same apply?

And if I already disturbed the thread with my questioning: how about 6m for the new mini qcx?

Depending on the answers I get to these questions I will decide if it makes more sense to wait for the new mini qcx or just retune an old qcx I already have.  

Yours friendly, Razvan DL2ARL


Re: QCX-mini update: solving the microphonics problem

Ted 2E0THH
 

On various work visits over the years, I can confirm Shunjuku station is indeed the most extraordinary station on earth. One year I was in a hotel overlooking it, mesmorising to watch and there are some amazing sped up videos of it on YouTube.

Very much looking forward to getting back to the kind and beautiful people of this nation.


73s Ted

2E0THH  


Re: QCX+ on 6M?

DL2ARL
 

WoW! QCX and 6m sounds great! How about the old QCX? Does the same apply?

And if I already disturbed the thread with my questioning: how about 6m for the new mini qcx?

Depending on the answers I get to these questions I will decide if it makes more sense to wait for the new mini qcx or just retune an old qcx I already have.  

Yours friendly, Razvan DL2ARL


Re: QCX-mini update 30-Sep-2020

Denis EI6IF
 

Gazing into my crystal ball ...

The mini will ship by the pallet load. The QSX in its time will do the same. Both will carve out market niches and both will endure.
The QCX+ while a fine product in itself may struggle in the shadow of the QSX. (Although that development board may be its hidden ace)

Anyway Hans congratulations on an outstanding and compelling product lineup!

Denis


Re: QCX-mini update 30-Sep-2020

Gwen Patton
 

I'd like one myself! (But I also want a QSX.)

-=-=-=-=-=-=-=-=-
73,
Gwen, NG3P


On Thu, Oct 1, 2020 at 2:21 PM Julian Rolfe via groups.io <g4uet=yahoo.co.uk@groups.io> wrote:
As over 10,000 expectant radio hams globally line up to grab one of the 1st 1000 kits.

Now thats going to be interesting, yes please. 

:-)




On Thursday, October 1, 2020, 6:57 pm, Christiaan PA3FUN <christiaan@...> wrote:

Hi Hans,

Maybe I'm asking for the obvious, but can you please give a shout here in this newsgroup the moment the qcx-mini order-hotline is opened?

73's Cristiaan PA3FUN


Re: QCX-mini update: solving the microphonics problem

Gwen Patton
 

There's a wonderful tv series called "Begin Japanology" about all sorts of Japanese culture. One episode is about the Japanese subways.


Worth watching. So is the rest of the series.

73,
Gwen, NG3P


On Thu, Oct 1, 2020, 2:04 PM Jerry Gaffke via groups.io <jgaffke=yahoo.com@groups.io> wrote:
Those photos of polite white gloved Japanese pushers make good click bait.
I click them.

Such pushers apparently exist in a number of countries.
Japan gets the most press, with Shinjuku Eki front and center:
    https://en.wikipedia.org/wiki/Passenger_pusher
Apparently less common once the recession hit in the 90's and the salaryman hordes diminished,
but I never saw them in '89 when the economy was going gangbusters.

First references I'm seeing for pushers are New York City of 100 years ago,
not long after they got the subway going.

Never heard of poles being used as pushers.
Perhaps in Warsaw?

Jerry, KE7ER



On Thu, Oct 1, 2020 at 07:14 AM, Hans Summers wrote:
In 5.5 years of daily subway commute, I never once saw anyone being pushed into trains with poles. I suppose they must exist somewhere and documentary makers know where to go and hunt for it hi hi. Rush-hour was crowded, yes. Not worse than London. 


Re: QCX onboard DVM/RF Not working & showing readings when Not Connected #qcx40

W5EGA@...
 

Hello Ed,

First of all, congrats on becoming a new HAM and congrats on undertaking assembling your own rig! I am not an electrical engineer - just an enthusiastic hobbyist. I too had a lot of troubleshooting and fixes to get my first kit working - but I did get it working! (And it works GREAT!)

Can you take a close-up picture of your main board and post it here? I would also suggest that you look at D4 and D6 to ensure that the diodes are oriented correctly on the board. One tip another member shared with me is to follow the PCB board traces (see the manual on page 14). This will help you find other components to verify and troubleshoot your problems. Basically it will help you to diagnose these types of issues better yourself. 

Have no fear, if you get stuck there are a lot of friendly and helpful people on here that will help get you going! 

73, John W5EGA


Re: QCX-mini update 30-Sep-2020

Julian Rolfe
 

As over 10,000 expectant radio hams globally line up to grab one of the 1st 1000 kits.

Now thats going to be interesting, yes please. 

:-)




On Thursday, October 1, 2020, 6:57 pm, Christiaan PA3FUN <christiaan@...> wrote:

Hi Hans,

Maybe I'm asking for the obvious, but can you please give a shout here in this newsgroup the moment the qcx-mini order-hotline is opened?

73's Cristiaan PA3FUN


Re: QCX-mini update: solving the microphonics problem

Hans Summers
 

Getting OT but...

Japan has an amazing public transport system. Highly efficient, ruthlessly punctual, and very low cost tickets (compared to UK for example). 

I once read that 43 of the world's 50 busiest railway stations are in Japan. 

Shinjuku (Tokyo) mentioned by Jerry just now, is by far the world's busiest railway station, the various lines handling in total around 4 million passengers per day through the station. There are over 200 exits to street level. 

During my 5.5 years living in Tokyo, Shinjuku was not part of my daily commute; but I have been there many times and as I recall, I almost ALWAYS got lost in the tunnels of Shunjuku station. 

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


On Thu, Oct 1, 2020 at 9:10 PM Shirley Dulcey KE1L <mark@...> wrote:
Really cramming people tightly into trains is only optimal if most of the passengers are getting off at the same stop. Otherwise, it takes too long for people to get out at the stops because they have to fight their way through the mass of passengers, and those long stoppages at the stations lower the overall capacity of the system because you can't run trains as often.

The evolution of Tokyo over time likely accounts for not seeing that kind of passenger packing when Hans and the others who have written in this thread were there. When the system was built, most people were headed toward the city's business core. As development continued, including development that was driven by the existence of the train system, other stops became important destinations in their own right rather than just being sources of passengers.

On Thu, Oct 1, 2020 at 2:04 PM Jerry Gaffke via groups.io <jgaffke=yahoo.com@groups.io> wrote:
Those photos of polite white gloved Japanese pushers make good click bait.
I click them.

Such pushers apparently exist in a number of countries.
Japan gets the most press, with Shinjuku Eki front and center:
    https://en.wikipedia.org/wiki/Passenger_pusher
Apparently less common once the recession hit in the 90's and the salaryman hordes diminished,
but I never saw them in '89 when the economy was going gangbusters.

First references I'm seeing for pushers are New York City of 100 years ago,
not long after they got the subway going.

Never heard of poles being used as pushers.
Perhaps in Warsaw?

Jerry, KE7ER



On Thu, Oct 1, 2020 at 07:14 AM, Hans Summers wrote:
In 5.5 years of daily subway commute, I never once saw anyone being pushed into trains with poles. I suppose they must exist somewhere and documentary makers know where to go and hunt for it hi hi. Rush-hour was crowded, yes. Not worse than London. 


Re: QCX+ 20 m start up problem voltage regulator?

Arv Evans
 

Hans

Agreed.  Since this response is sort of generic, I tried to make it as all-inclusive
and as educational as possible.  Similar questions have shown up on the
BITX20 discussion group, so this may help some who are members of both
groups.

I have three older 1602 LCD displays in my junk box.  Just now set up an Arduino
to drive text into each of them, with 20 ma on the backlight.  Grounding pin-3 results
in limited contrast that might be difficult to read in outside light at high noon. 
Adjusting the backlight level does help optimize the contrast (less backlight  is best).

I have 7 newer (less than 1 year old) 1602 LCDs and grounding pin-3 results in
quite viewable contrast levels. 

Of course your mileage may vary!  If you want to play with this and have both
1602 LCD and an Arduino you can use the LCD library in Arduino IDE to make
a test jig for LCD evaluation.  This also works well for developing your own
code for digital backlight control or for digital contrast control. 

Yes, we have discussed this before.  Every few years I go back to repeat the
tests, or just to test a questionable LCD to see if it is good or dead.  I have
not yet measured HF or AF noise generated by using PWM to control the
backlight.  That might depend to some extent on circuit bypassing, shielding,
measuring method, and power supply capability. 

Arv
_._


On Thu, Oct 1, 2020 at 11:32 AM Hans Summers <hans.summers@...> wrote:
Hi Arv
 
The LCD pin-3 and associated potentiometer only adjusts the contrast, not the backlight.
In fact on modern 1602 two-line displays you can usually just ground LCD pin-3 and omit
the contrast adjustment pot.  If the contrast potentiometer does not change the contrast
it may be that the top of the pot is not connected to +5 volts. 

Not on the QRP Labs LCD: you can't ground the contrast pin (pin 3)! I know Arv, we've been discussing this on and off for years, you and I... I still haven't come across and LCD module that looks anywhere near 1/4 decent if you ground it's pin 3!  
 
Current to the LED backlight on a 2-line 1602 LCD is through LCD pin 15 (+) and pin 16
(gnd).  Both of these pins are isolated from the rest of the display circuitry.  There is an
internal resistor on-board the LCD that limits this current to around 20 ma.  Since modern
LEDs are more efficient than older models you can add an external resistor between the
+5V and pin-15 to lower LED operating current to around 4 ma and still have enough
light for operating in ambient light situations.  Some have made this external resistance
a 2-watt potentiometer for manually adjusting the backlight. 

Note that in QCX the LED is powered from the 12V rail via a 270-ohm resistor. Not from the 5V rail. That was just a concession to the poor un-heatsinked (in the origianal QCX) 7805 voltage regulator. Actually it didn't toast but if you touched it you may think it suffered unduly. 
 
It is also possible to drive the
backlight with PWM output from the Arduino and a switching transistor, but that requires
adding the control function to Arduino software.

And requires somehow avoiding all the QRM that can generate :-D    And anyway the QCX has n Arduino :-) 

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


Re: QCX-mini update: solving the microphonics problem

Shirley Dulcey KE1L
 

Really cramming people tightly into trains is only optimal if most of the passengers are getting off at the same stop. Otherwise, it takes too long for people to get out at the stops because they have to fight their way through the mass of passengers, and those long stoppages at the stations lower the overall capacity of the system because you can't run trains as often.

The evolution of Tokyo over time likely accounts for not seeing that kind of passenger packing when Hans and the others who have written in this thread were there. When the system was built, most people were headed toward the city's business core. As development continued, including development that was driven by the existence of the train system, other stops became important destinations in their own right rather than just being sources of passengers.

On Thu, Oct 1, 2020 at 2:04 PM Jerry Gaffke via groups.io <jgaffke=yahoo.com@groups.io> wrote:
Those photos of polite white gloved Japanese pushers make good click bait.
I click them.

Such pushers apparently exist in a number of countries.
Japan gets the most press, with Shinjuku Eki front and center:
    https://en.wikipedia.org/wiki/Passenger_pusher
Apparently less common once the recession hit in the 90's and the salaryman hordes diminished,
but I never saw them in '89 when the economy was going gangbusters.

First references I'm seeing for pushers are New York City of 100 years ago,
not long after they got the subway going.

Never heard of poles being used as pushers.
Perhaps in Warsaw?

Jerry, KE7ER



On Thu, Oct 1, 2020 at 07:14 AM, Hans Summers wrote:
In 5.5 years of daily subway commute, I never once saw anyone being pushed into trains with poles. I suppose they must exist somewhere and documentary makers know where to go and hunt for it hi hi. Rush-hour was crowded, yes. Not worse than London. 


Re: QCX-mini update: solving the microphonics problem

Jerry Gaffke
 

Those photos of polite white gloved Japanese pushers make good click bait.
I click them.

Such pushers apparently exist in a number of countries.
Japan gets the most press, with Shinjuku Eki front and center:
    https://en.wikipedia.org/wiki/Passenger_pusher
Apparently less common once the recession hit in the 90's and the salaryman hordes diminished,
but I never saw them in '89 when the economy was going gangbusters.

First references I'm seeing for pushers are New York City of 100 years ago,
not long after they got the subway going.

Never heard of poles being used as pushers.
Perhaps in Warsaw?

Jerry, KE7ER



On Thu, Oct 1, 2020 at 07:14 AM, Hans Summers wrote:
In 5.5 years of daily subway commute, I never once saw anyone being pushed into trains with poles. I suppose they must exist somewhere and documentary makers know where to go and hunt for it hi hi. Rush-hour was crowded, yes. Not worse than London. 


Re: QCX-mini update 30-Sep-2020

Christiaan PA3FUN
 

Hi Hans,

Maybe I'm asking for the obvious, but can you please give a shout here in this newsgroup the moment the qcx-mini order-hotline is opened?

73's Cristiaan PA3FUN


Re: QCX+ 20 m start up problem voltage regulator?

Hans Summers
 

Hi Arv
 
The LCD pin-3 and associated potentiometer only adjusts the contrast, not the backlight.
In fact on modern 1602 two-line displays you can usually just ground LCD pin-3 and omit
the contrast adjustment pot.  If the contrast potentiometer does not change the contrast
it may be that the top of the pot is not connected to +5 volts. 

Not on the QRP Labs LCD: you can't ground the contrast pin (pin 3)! I know Arv, we've been discussing this on and off for years, you and I... I still haven't come across and LCD module that looks anywhere near 1/4 decent if you ground it's pin 3!  
 
Current to the LED backlight on a 2-line 1602 LCD is through LCD pin 15 (+) and pin 16
(gnd).  Both of these pins are isolated from the rest of the display circuitry.  There is an
internal resistor on-board the LCD that limits this current to around 20 ma.  Since modern
LEDs are more efficient than older models you can add an external resistor between the
+5V and pin-15 to lower LED operating current to around 4 ma and still have enough
light for operating in ambient light situations.  Some have made this external resistance
a 2-watt potentiometer for manually adjusting the backlight. 

Note that in QCX the LED is powered from the 12V rail via a 270-ohm resistor. Not from the 5V rail. That was just a concession to the poor un-heatsinked (in the origianal QCX) 7805 voltage regulator. Actually it didn't toast but if you touched it you may think it suffered unduly. 
 
It is also possible to drive the
backlight with PWM output from the Arduino and a switching transistor, but that requires
adding the control function to Arduino software.

And requires somehow avoiding all the QRM that can generate :-D    And anyway the QCX has n Arduino :-) 

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


Re: QCX+ 20 m start up problem voltage regulator?

Arv Evans
 

Daniel

The LCD pin-3 and associated potentiometer only adjusts the contrast, not the backlight.
In fact on modern 1602 two-line displays you can usually just ground LCD pin-3 and omit
the contrast adjustment pot.  If the contrast potentiometer does not change the contrast
it may be that the top of the pot is not connected to +5 volts. 

Current to the LED backlight on a 2-line 1602 LCD is through LCD pin 15 (+) and pin 16
(gnd).  Both of these pins are isolated from the rest of the display circuitry.  There is an
internal resistor on-board the LCD that limits this current to around 20 ma.  Since modern
LEDs are more efficient than older models you can add an external resistor between the
+5V and pin-15 to lower LED operating current to around 4 ma and still have enough
light for operating in ambient light situations.  Some have made this external resistance
a 2-watt potentiometer for manually adjusting the backlight.  It is also possible to drive the
backlight with PWM output from the Arduino and a switching transistor, but that requires
adding the control function to Arduino software.

Arv
_._


On Thu, Oct 1, 2020 at 10:22 AM Daniel Curtin KF4AV <danieljcurtin42@...> wrote:
I started up my just finished QCX+ ( I successfully got a QCX 40 going this spring.) The LCD backlight came on but varying the resistor didn't work. The voltage on pin 3 was very low around 1.3 V. I checked the voltage at the regulator 10 V in 1.3V or so out and hot. The regulator checks continuity to ground for the ground pin, but also on the output. I must have a short somewhere. Any ideas where to look first? I did carefully inspect the board visually before firing up.


Re: Shipping: no more unregistered shipping

Jim Mcilroy
 

Well Hans - I admire your patience and integrity.

When I encounter delays now and then the integrity of the sending party is the key thing when I have to ask them about a shipment.

On my marked card list are two particular vendors.

One sent me a Post Office tracking number and then spent a couple of weeks finding the software I'd ordered so he could sell it to me despite saying he had it in stock. The local post office once gave me half a dozen tracking stickers so I could prep parcels before bringing them down, so I can see how the vendor tried it on with that one.

The second declared stock on Amazon, and then spent a couple of weeks getting hold of the goods. The vendor assurances forwarded by Amazon were most elegant in their presentation.

At the end of the day though some people are just liars and unreconstructed PITAs.

73

Jim

On 01/10/2020 15:55, Hans Summers wrote:
Hi all

I have decided to disable the untracked, unregistered, uninsured, "your risk" shipping option in the QRP Labs shop - which I had anyway only made available for low weight items. I had introduced this untracked shipping service at the same time I introduced the FedEx Express (TNT) courier option). 

Sadly, a number of people evidently appear unable to parse the description of this lowest cost post office airmail shipping, and then they later email me asking for the tracking code, where is the package, when will it arrive, etc. Furthermore, and also sadly, during the Covid19 pandemic post office delivery to a lot of places has been unbelievably slow. All of which is outside my control.

I have become tired of explaining to people what "untracked, unregistered, uninsured, your risk" means, even though I wrote it all on the shipping FAQ... and recommending that they use FedEx Express (TNT) next time which takes around 4 business days and costs only a few $ more. But what tipped me over the edge, is a long chain of correspondence with a rather angry customer who wasn't a fan of the "coronavirus excuse" and who failed a PayPal claim for a refund. I repeatedly mentioned that we have had many reports of multi-week or even multi-month post office deliveries and he had not even waited the amount of time that it used to take, pre-pandemic... and I had to keep explaining we don't have a tracking number, because he chose the option without tracking. Then I had to explain all this again and again to the PayPal robots. I even provided and uploaded our proof of posting. 

But today I received PayPal's judgement on the case, which is in favour of the Buyer, because I had not provided proof of delivery. I filed an appeal stating again that there is NO proof of delivery, the Buyer chose unregistered untracked and he just needs to wait longer anyway already... but my appeal was rejected too. So they did the refund. And almost certainly the buyer will get the package too, when he's waited longer. 

So now there are two options: post office tracked, and FedEx Express (TNT). 

Makes me sad. But there it is. Life. Worst things happen, I guess. But I don't want to waste valuable scarce time and energy on that kind of stuff. 

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



Re: BPF 80m

KI7MWA
 

Well...okay, I guess...  Still, it would be interesting to learn how Hans was able to achieve an insertion loss of 1.27 dB (as reported in the bpf construction manual) while I have been unable to get less than 5 dB loss.

But, thank you, none-the-less.


QCX+ 20 m start up problem voltage regulator?

Daniel Curtin KF4AV
 

I started up my just finished QCX+ ( I successfully got a QCX 40 going this spring.) The LCD backlight came on but varying the resistor didn't work. The voltage on pin 3 was very low around 1.3 V. I checked the voltage at the regulator 10 V in 1.3V or so out and hot. The regulator checks continuity to ground for the ground pin, but also on the output. I must have a short somewhere. Any ideas where to look first? I did carefully inspect the board visually before firing up.

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