Date   

Re: QCX/QCX+ Serial number 10,000 auction for fun

Hans Summers
 

Hi Al 
QCX/QCX+ sales just passed the 10,000 number.
I'm sure this is practically impossible to know, but has any QRP kit radio ever done this? Maybe HW-8? Truly impressive, Hans!

I wonder if the Elecraft K2 reached that milestone? It's gotta be close. But you won't get one of those for $55!

Congrats!

Thanks! 

I have the greatest respect for Elecraft, their ethos, design, everything. But yes, they are at the opposite end of a price range to QRP Labs Hi hi. 

As far as I know: the K2 was introduced in 1999 and I remember reading somewhere (though my memory could be inaccurate - correct me if I am wrong, please!), the K2 sales did indeed pass the 10,000 milestone - but that took 20 years. 

The QCX took only 2.75 years to cross that milestone :-)

But we are of course comparing apples and oranges, it's not really a fair comparison at all. It's normally the case that sales volume and price tend to be inversely proportional. 

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


Re: A great QCX-QCX contact and salute to youth

Andy Brilleaux [O.B.E. pending] <punkbiscuit@...>
 

Thanks for the insight Hans.
Makes me grateful for living in the UK for a change.
And with that, I'll gracefully slide out of this one ;-)


Re: A great QCX-QCX contact and salute to youth

Hans Summers
 

Hi Steve: congratulations! Great story!

Hi Andy: 

When I was living in Tokyo, 2011-2016, I got licensed as JI1BVC. I well remember that under the terms of the Japanese license, the license actually allows you to operate only certain radios which are listed on your license. At the time of applying for the license, you need to list the radios which you intend to use, and their approval number. If you later decide that you wish to use another radio, you are supposed to complete some more paperwork (and a fee) and it gets added to your license. 

Homebrew rigs are possible - but again are supposed to be approved. It is necessary to submit a block diagram and a technical description (as well as a fee naturally), and get it approved and listed on your license. 

One of the criteria for transceiver equipment approval is that the radio is supposed to limit transmitting to within the amateur bands. Which is not even quite as straightforward as it ought to be, since some of the bands (80m for example) are not a continuous allocation such as 3.5 - 3.8MHz; 80m is broken into several smaller allocations in Japan. 

If all this sounds rather complicated - it is... and to the best of my knowledge, not a few Japanese hams (and particularly those of a homebrewing variety) take the decision to ignore all this, and just get on with it. 

However - FYI - and why I decided to jump into this thread even though we have Japanese members here who could no doubt answer more succinctly and accurately than I have... what people may not be aware of is that both the Ultimate3S and the QCX kits have a corresponding "Japanese firmware version" which is available on request at time of ordering. These special firmware versions are the same as the mainstream firmware versions in almost all aspects except that:

1) They do not permit transmission outside the Japanese amateur band allocations

2) Since both the QCX and U3S firmware completely fills the available 32K Flash memory space, in order to perform the frequency boundary checks, some other piece of functionality had to be disabled; for example in the case of QCX, the Japanese firmware version performs the frequency boundary checks but it cannot transmit WSPR. 

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

On Thu, May 28, 2020 at 8:06 AM Andy Brilleaux [O.B.E. pending] via groups.io <punkbiscuit=googlemail.com@groups.io> wrote:
Getting it permitted for use in Japan ?

You mean you can't even build your own rig
there, or do they go overboard with type approval stuff ?


Re: A great QCX-QCX contact and salute to youth

Andy Brilleaux [O.B.E. pending] <punkbiscuit@...>
 

Getting it permitted for use in Japan ?

You mean you can't even build your own rig
there, or do they go overboard with type approval stuff ?


Re: Miracle Whip and the QCX

Andy Brilleaux [O.B.E. pending] <punkbiscuit@...>
 

Adding something like 4 X 1.5 metre long
radials to a miracle whip would gain you about
6db.

I was surprised at how much difference it made
even though the length of them is so puny.


Re: Miracle Whip and the QCX

Skip Davis
 

On the HFpack website there is a vertical antenna shootout that compares various portable antennas, the Miracle Whip was one of them. I seem to remember one earlier shootout that by adding a counterpoise it improved the performance of the antenna somewhat.
I never owned one but I built one from bits and pieces I had on hand. I use it as a portable receive antenna and it worked Ok for that But don’t remember if I tried to transmit with it.

Skip Davis, NC9O


A great QCX-QCX contact and salute to youth

Steve in Okinawa
 

A year or so ago I heard a QRP station on 40 cw and answered the CQ using my QCX. It was Saku, JS6OUG, up in Hyogo prefecture. He was using A FT-817, and had a great fist and also excellent English. In the course of our QSO I learned he was only 14 and in Junior high school. I was also in Junior high when I got started in ham radio. He expressed interest in my QCX and said he would look into buying a kit. The next I heard from him he had written to this group asking for some troubleshooting help, and then afterwards saying he had it going and was trying to get it permitted for use in Japan. Then last night I finished a (QRO) QSO with a stateside station on 40 and heard Saku calling me.  I switched to my QCX and we had a brief but very satisfying chat. This was a win for both of us, and I think also for QRPlabs and the hobby as a whole.  73, Steve


Re: [help] Only noise being seen while IQ balance / phase lo / phase hi.

Jose Tent
 

Hmmm... I'm looking at my own information, but I have no idea where to start looking other than perhaps being mindful of my soldering jumping in advertantly to a 12v path......

I'm looking at the circuit track/traces and seeing where the 12v paths are.  But, I definitely could use an elmer to throw me a hint or two. 


Re: QCX/QCX+ Serial number 10,000 auction for fun

Al Gritzmacher AE2T
 

On Fri, May 15, 2020 at 12:37 PM, Michael N6MST wrote:
On Fri, May 15, 2020 at 08:54 AM, Hans Summers wrote:
QCX/QCX+ sales just passed the 10,000 number.
I'm sure this is practically impossible to know, but has any QRP kit radio ever done this? Maybe HW-8? Truly impressive, Hans!

I wonder if the Elecraft K2 reached that milestone? It's gotta be close. But you won't get one of those for $55!

Congrats!


Re: Miracle Whip and the QCX

Steve in Okinawa
 

20 meters. :). Oh, sorry. Try a BLT for starters.


Re: ProgRock + TCXO + GPS Stability/Accuracy

Giuseppe Marullo
 

Hi Sid,

I know that some people got their "quirks" with the accuracy of this, you were not the only one looking back the ML.
I have received a new MCU, to rule out eeprom wear, since I kept it powered several weeks and if fhe eeprom is written once a second, well I expect it not to work anymore, theoretically it will die after 27hours. I was past 10x this period, easily.

My problem is not that it is not spot on on 10MHz. The problem is that it stays about 2.4Hz below 10MHz of my Trimble. It is almost constant, like either my Trimble is not 10MHz and it is stable, let's say it is @ 10.0000024MHz, or ProgRock decides that 9.9999976MHJz is the right frequency. I am evaluating getting another source for my lab, if I could acquire at a decent price. Unfortunately there is no visible feedback from the ProgRock about what is really doing, if it consider itself within range or what.

The most common "solution" recommended is to replace the xtal with a
TCXO which is no solution that simply masks the problem. That's the discipline...use a clock source that does not drift!!
Hehe, mind to give me a DigiKey part number with less than 12 digits in the price column? Everything drifts within a hobbyist budget, that the point in the disciplined part of their name.
I am already using QRPLabs TCXO BTW.

Waiting to perform the surgery on the ProgRock, then I will analyze the PSU too(didn't check it yet). Not much left to look at though.

I am building some GPIB interfaces to connect the frequency counter and log data programmatically, it will take 2-3weeks tough, waiting for AR488 pcb to arrive.

Giuseppe Marullo
IW2JWW - JN45RQ


Re: [help] Only noise being seen while IQ balance / phase lo / phase hi.

Jose Tent
 

I want to thank everyone for their inputs so far !. 

News 1:  THE DETOUR
I followed the official "Debugging QCX issues ~~" video, parts of it follows through the IC's looking at the voltage as Ron suggested.  (Thank you Ron)  Doing this I found IC9 Pin 1 is 5 volts.   According to the video at 16:58, it should be 2.5v !   BUTTTTTTTTT..... I go back to my Rev5e manual and page 139 indicates IC9 Pin 1 *SHOULD* indeed be 5 Volts ???   So I guess the video is wrong OR the design has been updated.

News 2:   PAYDIRT ?
I decided to measure voltage at all the pins of all the IC and compare against the manual. (Vs. Youtube)  I'm finding some voltages that are competely off....

Here are some voltage at the IC that isn't jiving with the manual :  Input volitage is 12.36 volts btw. 
IC6       Pin #3,5 measures around 2.5v  [manual indicates lower at 1.x v)
IC7       Pin #3,5 measures around 2.5v  [Manual = 2v]     *within tolerance ??*
IC8       Pin #5 measures around 2.37v  [Manual = 0.67v]
IC9       Pin #3,5 measures around 2.5v [Manual = 0.65v]
IC10     
     Pin #1,2,3,7 measures 12 volts [Manual = 5.83v]      ??!!??!! 
     Pin #4,5 is measuring 3.02 and 2.31v  [manual = 4.21 and 3.94 ]     *within tolerance ??*
     
 So perhaps I have a inadvertant jump in connections somewhere......  I have to think about this a bit more to figure what is wrong.  


Re: QCX vs. QCX+ Form Factor Question

Damon Carpenter - K5RZ
 

Great news, Hans. Thank you very much for confirming. 

May you sell 50,000 units in 2020 alone!

73,

Damon
K5RZ


Re: IRF510 #alignment

ajparent1/KB1GMX
 

Usual order is well over that anyway.  I try to not order a few
unless expensive like the last transistor order.  BLF184, that put me
well over 50$.  Even then a big bunch of small parts.

Allison
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Re: QCX, QLG1, v1.05 ... WSPR?

 

Hi Bob,
"Send" as in "send my reply": what I meant was I was about to send my reply when I noticed that in the GPS data page, with the unit connected, not only are the first two fields dashed, but the last two were also intermittent.

I had been trying to get the 20m unit working all day with no success. So... um... it turns out WSPR doesn't work if you leave the QCX in practice mode...which would explain why I got nothing all day :-(

But my GPS data still isn't showing up properly on either unit.... Anybody else experience that?

Julian N4JO.


Re: Miracle Whip and the QCX

jjpurdum
 

err...I sorta did hijack your thread...sorry 'bout that...

Jack, W8TEE

On Wednesday, May 27, 2020, 9:37:10 PM EDT, George Korper <georgekorper@...> wrote:


Gee, it is a Miracle. I got a wonderful antenna back and Amazon got an order of Mayo. 

On Wed, May 27, 2020, 8:25 PM jjpurdum via groups.io <jjpurdum=yahoo.com@groups.io> wrote:
OK, Steve...just ordered a bottle from Amazon. What's the first thing I should use it on?

Jack, W8TEE

On Wednesday, May 27, 2020, 6:56:13 PM EDT, Steve in Okinawa <sfab43@...> wrote:


Jack, you know how the Japanese have dominated the quality ham radio market for decades? Well. try Kewpie mayonnaise if you can find it.  You may be an inveterate "maker" but you'll love the Japanese store bought mayo. JS6TMW


Re: Miracle Whip and the QCX

George Korper
 

Gee, it is a Miracle. I got a wonderful antenna back and Amazon got an order of Mayo. 


On Wed, May 27, 2020, 8:25 PM jjpurdum via groups.io <jjpurdum=yahoo.com@groups.io> wrote:
OK, Steve...just ordered a bottle from Amazon. What's the first thing I should use it on?

Jack, W8TEE

On Wednesday, May 27, 2020, 6:56:13 PM EDT, Steve in Okinawa <sfab43@...> wrote:


Jack, you know how the Japanese have dominated the quality ham radio market for decades? Well. try Kewpie mayonnaise if you can find it.  You may be an inveterate "maker" but you'll love the Japanese store bought mayo. JS6TMW


Re: Miracle Whip and the QCX

jjpurdum
 

OK, Steve...just ordered a bottle from Amazon. What's the first thing I should use it on?

Jack, W8TEE

On Wednesday, May 27, 2020, 6:56:13 PM EDT, Steve in Okinawa <sfab43@...> wrote:


Jack, you know how the Japanese have dominated the quality ham radio market for decades? Well. try Kewpie mayonnaise if you can find it.  You may be an inveterate "maker" but you'll love the Japanese store bought mayo. JS6TMW


Re: IRF510 #alignment

jjpurdum
 

The free shipping stopped about a year ago. The new "free shipping" is on orders over $50.

Jack, W8TEE

On Wednesday, May 27, 2020, 7:43:56 PM EDT, Ryan Flowers <geocrasher@...> wrote:


Don't forget Arrow Electronics with their free shipping:

https://www.arrow.com/en/products/irf510pbf/vishay  

Ryan Flowers



On Wed, May 27, 2020 at 4:38 PM Dave VE3LHO <dave@...> wrote:
When it comes to fake versus real components hearsay versus verifiable fact is very hard to find. To me "verifiable" would involve identifying the presumed maker (e.g. Vishay) and having them verify that it's their part and "real". But seriously who would bother to (try to) do that for an IRF510 for ham use? Especially when the solution (for an IRF510) is so simple: buy from a reliable source.

Everyone's definition of reliable is up to them. I wouldn't trust an Amazon vendor of IRF510s more than I would trust one on eBay but that's just me.

For those of us in North America there are Digikey and Mouser, both of whom offer $8 shipping options for small shipments like a few IRF510s. My advice to those who rail at paying $8: Buy a few. Hey they're cheap and you already blew 'em up once :-) Don't think of it as being $8 for shipping. Think of it as part of the price. Yes the per part cost went up a fair bit but they are still not really expensive and it'll make you feel better that you passed up the free shipping from China. Besides if the comparison is with China (which may be true when buying on Amazon as well) you'll get the Digikey/Mouser parts sooner.

As for sweep tube based finals, it was the tune up that got me in trouble. Fortunately, this was back when they were cheap and available. I lived in a small town and even my local corner store had a tube tester and small stock of tubes between the magazine rack and the soft drink cooler.

On Wed, May 27, 2020 at 09:05 AM, ajparent1/KB1GMX wrote:
Dave VE3HLO,

The problem is hearsay vs fact.  I never use Ebay.  I have ordered IRF510s from
Amazon with good success.  Some seem to have issues.

FYI I've used some of the so called audio MOSFETS supplied to me by
others from EBAY sources, they were marked IRF510 in one case and in
another supplied as IRF510 but actually marked IRF530, they measured
more like IRF530 (so for the marked part it was really real) or IRF640 and
when circuit allowances for the much higher input C and output C were taken
they also produced power, some cases much more!  So yes there are
counterfeits and they still are capable.

There are echo chambers on the 'net (and sometimes here) where all manner
of error filled and mistaken info gets repeated.  That and many examples of
copied circuits that turn out to be copies of bad copies that worked poorly
from the start.  Take into account counterfeits that is the origin of
"they don't work" and the RD16HHF1 groupies.   FYI I use the RD parts
and they are good especially for 2M and up but not enough to make
religious icon of them for RF power.  I reserve that for Parts with BLF prefix.

As to sweep tubes, Tempo-One (aka FT200),  Siltronics1011c, NCX3 (6JG5x2).
They do work very well, most were killed by tune-up or gross over drive.  The
biggest issue with them is try to find replacements without spending much
treasure.  Back when they were very cheap, now scarce.

Allison
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Please reply on list so we can share.
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--
Ryan Flowers - W7RLF
MiscDotGeek - QRP and More


Re: 10W HF Linear PA - Question on R209/R210 #pa

Gwen Patton
 

Ahh, I see that I did misread it. I thought the gates of the MOSFETs went to ground. 

In the words of Emily Litella..."never mind!"


On Wed, May 27, 2020, 8:11 PM Gwen Patton <ardrhi@...> wrote:
I'm talking about the schematic Bruce posted at the beginning of this thread.

If I've misread that schematic, I wouldn't be surprised. But it looks like a voltage divider.

73,
Gwen, NG3P

On Wed, May 27, 2020, 7:58 PM ajparent1/KB1GMX <kb1gmx@...> wrote:
Gwen,

What amp are you talking about? 
The 10W PA has two pots for setting the bias to the IRF510s.
The 220 ohm resistor have no current flow save for at RF
so its electrically neutral for Bias.    Also the !)w Linear amp is
two stages of gain first two are BS170s running push pull
class AB and IRF510s running push pull class AB1 (idle
current about 100-200ma).

The 50W QCX PA is a totally different creature.
Simpler bias as it only need to get the gate to the DC point
to just below  conduction of the IRF510s.

Amp design is a thing I did for money and fun during the years
in engineering.

Allison
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