Date   
Re: IRF510 #alignment

Ryan Flowers
 

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


--
Ryan Flowers - W7RLF
MiscDotGeek - QRP and More

Re: IRF510 #alignment

Dave VE3LHO
 

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

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

Arv Evans
 

Julian

Not using a GPS here although I do have a couple old Garmin-35 units left 
over from when I ran a tracking system company.

My time clock for digital modes is a 10 MHz temperature stabilized crystal 
oscillator with a looooong divider chain down to 1 PPS.  It is zero-beat with 
WWV via a direct-conversion receiver (SA-612 driven by 10.000 MHz oscillator). 
With a DC oscilloscope or DVM on the mixer output it is possible to see errors 
of less than  1/4 Hz as the beat-note caused DC output slowly moves up and 
down.

For accurate date and time I Use NTP on a Linux PC. 
For non-moving locations NTP synced output from the Linux "date" 
command can be used to provide a GPS like output string.  Hans and 
myself have discussed this in the long distant past and have even used 
it to test systems that require GPS-RMC input strings.

Also have strong DGPS signals from a 325 KHz station in eastern Oregon, 
but have never been able to find if DGPS LF transmitters are synched to 
satellite GPS frequency.  It they are synched that might be a good source of 
time, location, and frequency signals.  Thinking in this direction is possibility 
of building a TRF receiver that phase-locks to the 325 KHz DGPS carrier, 
followed by a divide by 325,000 to get 1 PPS.

Bottom line, I am interested in digital modes but not yet interested enough 
to actively participate.  At 78 years old it sometimes takes lots of motivation 
to get me started on big projects.    I spend more time working in my shop 
with a Chinese made mini-Lathe Lathe and on a CNC controlled DIY milling
machine.I have built and use a disk sander, belt sander, surface grinder, 
and have a 225A welder for really big fabrication projects.

Arv
_._

On Wed, May 27, 2020 at 4:05 PM Julian Opificius <n4jo@...> wrote:
Thanks. Are you using the GPS unit?

Re: Miracle Whip and the QCX

Steve in Okinawa
 

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

N3MNT
 

Works fine for me as well.  Not sure what you mean by hitting send.  When you enter beacon mode with parameters sent correctly, the transmission is automated.Are you leaving GPS connected while using WSPR?

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

N3MNT
 

W

Re: 28 pin socket... #40m #qcx

Mike Besemer - WM4B
 

All,

 

He’s sending the QCX to me and I’ll attempt to repair for him at cost.  I have a new QCX on the bench ready to rock-and-roll, so I’ll have a known-good one to make comparisons with.  Hopefully I’m up to the job; I was just running out of my own projects pending the arrival of my QCX+ and the (hopefully) arrival of my U3S and Clock case – still on a slow boat from China.

 

Mike

WM4B

 

From: QRPLabs@groups.io [mailto:QRPLabs@groups.io] On Behalf Of Julian Opificius
Sent: Wednesday, May 27, 2020 6:07 PM
To: QRPLabs@groups.io
Subject: Re: [QRPLabs] 28 pin socket... #40m #qcx

 

you can send it to me and I'll fix it for you at cost ...

Julian N4JO

Re: 28 pin socket... #40m #qcx

 

you can send it to me and I'll fix it for you at cost ...

Julian N4JO

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

 

Thanks. Are you using the GPS unit?

Re: Ready built units

Mike Besemer - WM4B
 

Lead solder will not disappear as long as the MILSPEC requires it – forever I hope.  Lead-free solder never seems to get past the ‘plastic’ stage… it’s like working with Elmer’s Glue.  I keep several pounds of eutectic solder on-hand all the time.

 

Mike

WM4B

 

From: QRPLabs@groups.io [mailto:QRPLabs@groups.io] On Behalf Of Joe Lauricella
Sent: Wednesday, May 27, 2020 5:47 PM
To: QRPLabs@groups.io
Subject: Re: [QRPLabs] Ready built units

 

FWIW I operated a wave soldering machine for 17 years from 1982-1999 and a Mydata pick/place machine and decided in mid 90's to go to the Doctor for lead testing. Nothing. Keep in mind that the machine was vented to the outside world so the flux bath and smoke was vented away from me. Once the boards came out of the machine, they went into the sink of warm water for scrubbing (water soluble flux), but despite handling all those board for 17 years, it didn't get into my bloodstream. Maybe I got lucky - not sure but no health issues. I hope my supply of 63/37 lasts a while :-)
--
Thanks and 73,
Joe - AD2DX

Re: 28 pin socket... #40m #qcx

Gwen Patton
 

I hate to be obtuse, but did you try checking the contrast adjustment on the display, B. A.? It might be working just fine, but the contrast is off so it's showing a row of blocks.

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


On Wed, May 27, 2020 at 5:01 PM B.A. Black <k5bez1@...> wrote:
ok, got the new chip today.
after I installed the new socket and the new chip...
same song..just a row of boxes of the top line of the lcd...

Anybody want a free QCX???

Re: Ready built units

Joe Lauricella
 

FWIW I operated a wave soldering machine for 17 years from 1982-1999 and a Mydata pick/place machine and decided in mid 90's to go to the Doctor for lead testing. Nothing. Keep in mind that the machine was vented to the outside world so the flux bath and smoke was vented away from me. Once the boards came out of the machine, they went into the sink of warm water for scrubbing (water soluble flux), but despite handling all those board for 17 years, it didn't get into my bloodstream. Maybe I got lucky - not sure but no health issues. I hope my supply of 63/37 lasts a while :-)
--
Thanks and 73,
Joe - AD2DX

Re: QCX - Problem with new 30 meter QCX Initial Alignment

Don W4ZYT
 

I hate to seem so dense.

Viewing the switch from above, the left tab produces a full continuity reading between it and pin 12 of IC 2.  Hence that must be ROT A.  No continuity between the right switch tab and pin 13 - ROY B.  Just checking, I see about 20K ohms between the left tab - ROT A - and pin 13, which I assume is expected.

So you are suggesting trying a jumper between the right tab of the switch and pin 13 of IC 2.  Will do.

Again, many thanks for your guidance.  And your patience.

Vy 73

Don




Don Lynch W4ZYT
Virginia Beach, VA

On May 27, 2020, at 3:55 PM, Ronald Taylor <wa7gil@...> wrote:

Don, ROT A goes to IC2 pin 12 and ROT B goes to pin 13. Please clarify which one of those has continuity and which doesn’t. Probably the best solution would be to run a jumper directly between the encoder terminal and the IC2 pin that doesn’t have continuity. 

Ron



On Wed, May 27, 2020 at 11:20 Don W4ZYT <w4zyt.don@...> wrote:
On Tue, May 26, 2020 at 04:15 PM, Ronald Taylor wrote:
Don, the behavior of the rotary encoder and the voltage problem on IC2 pin 13 indicates to me either a cold solder joint Or defective rotary encoder. I suggest re soldering the connections on the rotary encoder and on pins 12 & 13 of IC2 as a start. Those are the processor pins connected to the encoder.  Hold your iron on the joints for a few seconds until you see the solder flow. A bad encoder is a rarity so start with the joints. 
 
Ron

On Mon, May 25, 2020 at 13:10 Don W4ZYT <w4zyt.don@...> wrote:
On Sun, May 24, 2020, 23:54 Don <w4zyt.don@...> wrote:
I purchased a  new 30-meter QCX xcvr earlier this month (PCB Rev. 5, Firmware 1.04) and have finished assembling it.  I have adjusted the screen contrast without problems to show the initial information - "T1.04, 2020 30 mtr xcvr" etc.  However, I have been unable to proceed with alignment as I cannot get the boot up screen showing "Select Band" and "80m" to advance.  I turn the center knob (rotor switch) left or right and it switches to "10m" but will not show any other band.  This would reset to "80m" if I switched off and then on again. Today, I clicked the rotor switch, thinking I might progress into the alignment scheme, and later reset the band using the factory reset, and it brought up "3820.0" but no further response to rotating the switch.  Turning off power now fails to reset this, and it is now stuck showing that 80 meter frequency. Consequently, further alignment is still not possible.  I have carefully avoided pushing either of the two smaller buttons, so don't know what their effect might be.

I have been back over the board and components carefully, resoldered what appeared to be several cold joints, checked for bent and misplaced IC pins, shorts, solder bridges, component orientation, and missing hardware - all OK.  Using the voltage chart on pp. 131-132 I have done some checking with my two AVMs.  Voltages on ICs 5 through 10 are all consistent nominally with what is shown in the troubleshooting section.  That is also true of the voltages for IC3, which I suspect reflects "receive" mode - all 14 points agree with the chart.  I also checked voltages at the several points on T1 and the points on C2 and D2, and those are correct.  On IC2, Most values are approximately what the chart on page 131 shows, although some are almost a volt higher.  I attribute this to the alignment not yet having been completed, but I don't know that these may also represent a problem.  The 20 Mhz crystal was checked with a portable receiver and is oscillating.
 
    Having read in several notes about the test pins contributing to inadvertent shorts during testing, alignment , or repair, I elected to leave those out for the time being, but all other components are       present and appear to be the proper items.

The big discrepancy on IC2 is pin 12, which should read around 1.9 volts and shows an voltage oscillating between about 2 and about 3.5 volts - with a regular period of about 140 cycles per minute.  Also, pin 13, which should show "0" shows a voltage of 4.92 volts. I have been over the schematic and the PCB chart but am not that adept at following it after a certain point and have not been able to resolve this. The problem does seem to involve the rotor switch.

I do not have or have access to an oscilloscope, and have no experience using one.

So I am at an impasse and would appreciate any guidance.  I'm a surgeon with limited background in electronics, and most of my kitbuilding was in the vacuum tube era, although it was accomplished successfully.  I'm a bit rusty, but do have some soldering experience, albeit limited experience with PCB construction.

Vy 73,

Don Lynch W4ZYT
 
--
Don Lynch MD W4ZYT 
Virginia Beach, Virginia
==
Donald F. Lynch, Jr., MD, FACS
 

 

 


 Hi Ron-

Per your guidance, I went back through and re-soldered all possibly questionable joints with special attention to - as you suggested - IC 2 and the rotary encoder switch.  I then rechecked voltages and the continuity between the rotary switch and pins 12 and 13 of IC 2.  When I applied power, I could turn the rotary switch counter clockwise and was able to advance the alignment process to "1. Preset"  at which point it would go no further.  Nothing happens when I turn the switch in a clockwise direction. I feel like I am moving ahead by baby steps :o), but at least it's forward movement.

In checking continuity from the rotary switch to ground and to IC 2, continuity between the center (ground) tab and ground was present.  Continuity between the left tab and pins 12 and 13 of IC 2 was also intact, however there was no continuity between the right tab and IC2.  As you suggested, the switch itself seems fine.

I broke out my old surgical magnifying loupes, and with that magnification, traced the PCB markings on the bottom of the PCB relative to the right sided rotary switch tab..  Referring to the chart, there is a very short blue trace which goes to the middle lower of the six diagnostic pins to the right of the switch - that was, no surprise, intact.  When one looks at the diagram of the right tab on the rotary switch, there is a second red trace (top of PCB) which extends immediately due north from the right tab to a blue trace which then goes to IC2.  With the switch installed, that top trace is under the switch and can't be accessed.  There is one of the tiny apertures at the north end of that red trace which is at the south end of a blue trace going to IC 2. This aperture would admit the tip of my VOM, and continuity between that end of the (blue) trace and pins 12 and 13 is present.  So it appears that there is a break in that (red) trace such that the right tab of the switch does not connect with the trace to IC2. 

I have limited experience with modern PCBs such as this one, and no experience with their repair.  If the problem is as the diagram suggests, how would one repair that bridge or test the connection to see if that resolves the problem I'm having? The rotary switch covers the section of the top of the board involved, so short of removing the switch a topside approach seems precluded.  Is there an acceptable "work-around/"  I guess one could run a wire along the bottom side of the board between the right side tab and (it looks like) pin 2 of IC 2 which connects with the appropriate other pins.  Or possibly install a very small calibre jumper wire between the right tab and the small aperture due north of the right tab on the bottom of the board.  I haven't tried either of these; just trying to reason this through.

What should my next step be?  I'm going to research postage to Izmir, just in case :o)

I am very grateful for your interest and help with this.  I will copy Hans as well.

Best regards,

Don Lynch W4ZYT

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

Ronald Taylor
 

Jose, since you got a good setting of the BPF, that means the signal is getting as far as the IQ balance control/CW filter input area of the board. The BPF tone measuring point is in that location. The monitoring point for the balancing and nulling adjustments is at the input of the last audio stage, IC10A. So the signal is being lost somewhere between the input of the CW filter and the output of IC 10B. 

I couldn't tell from the thread but if you haven't yet measured all the DC voltages around ICs8, 9 and 10, you should do that next. Expect the approximately 2.5 volts on1,2,3,5,6 and 7 of IC8 and 5,6 and 7 of IC9. I,2 and 3 of IC9 might be a little different as it is no longer part of the DC coupled circuitry like all the opamps  preceding it. But its still somewhere in that range I think. Pins 1,2,3,5,6 and 7 of IC10 will be somewhere around half the supply voltage.

If any of those are off, re-check connections in that area. If all is right, then you need to find a way to trace the signal through those stages. With the unit in the alignment mode (test tone present), flow it back from the last stage, output, input, next to last stage output, input etc till you find where it stops. Don't replace an opamp until you are certain it's not something else... Hope this helps

73 ... Ron

Re: 28 pin socket... #40m #qcx

B.A. Black
 

ok, got the new chip today.
after I installed the new socket and the new chip...
same song..just a row of boxes of the top line of the lcd...

Anybody want a free QCX???

Re: Heresy follows Re: [QRPLabs] IRF510 #alignment

Bill Cromwell
 

Hi,

Nixie is a brand (or sub-brand). The ones with a grid are the ones claimed to have been used in a regenerative detector. The maker did not claim it was a good one:) He only did it to see if it would function.

Not all off-label uses turn out well.

73,

Bill KU8H

On 5/27/20 12:44 PM, ajparent1/KB1GMX wrote:
---snip-----
Nixies cannot amplify as they are neon glow I've done Neon tube logic.
The slightly newer Vacuum glow tubes (blue green) (both 7 and 15
segment) can amplify as the plate is the glowing segment and there
is a grid makes a fair regen, but they are terribly microphonic (long
filament vibrates).
Allison
--
bark less - wag more

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

Mike Besemer - WM4B
 

Works fine for me since 1.05 came out.

 

Mike

WM4B

 

From: QRPLabs@groups.io [mailto:QRPLabs@groups.io] On Behalf Of Julian Opificius
Sent: Wednesday, May 27, 2020 2:14 PM
To: QRPLabs@groups.io
Subject: [QRPLabs] QCX, QLG1, v1.05 ... WSPR?

 

Can anybody confirm that QCX, QLG1 and firmware v1.05 work together properly with WSPR?

I enjoyed good returns on WSPR with both my QCX 40 and my QCX 20 prior to  v1.05 and prior to QLG1.
Yesterday with v1.05 only I got typical returns on the 20m unit while I was building my newly arrived QLG1.
Since I connected the QLG1 which, by all indications, is working correctly, and I used it to calibrate the 20MHz and 27MHz clocks, I haven't heard a peep from wsprnet.

Diag on QLG1 is "A -- f-- t12 s26" (s value drops to 5 occasionally, but no lower). At some point there was something after "A" and something after "f", as it appeared and disappeared immediately after I pressed "select" to update.

The QLG1 lamps flash, as described, the QCX's identify it and respond as anticipated. The calibration values on the ref and system clocks look reasonable, settling at 27,003,887 and 20,006,197 respectively after the heartbeats.

I was about to hit "Send" saying "nothing seems wrong, behaviorally, yet I haven't heard a squeak out of WSPRnet since connecting the QLG1." but on further gazing I did notice that with both QCX's, the "t" and "s" fields blank out occasionally too.

Julian N4JO.

Re: IRF510 #alignment

Gwen Patton
 

Alan,

Thanks, that, the bias circuit, and the caps will be my first choices. I'll widen the search from there.

But as Allison said, this has gotten further afield than I intended. My intent was simply to make clear that electronic components, much like prescription medications, are frequently used off-label...sometimes more often off-label than for their intended use!

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


On Wed, May 27, 2020 at 2:58 PM Alan G4ZFQ <alan4alan@...> wrote:
> suddenly the gain would drop way down

Gwen,

I think the first thing is to check the antenna relay.

73 Alan G4ZFQ



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

jjpurdum
 

Soon? That many are on backorder!  :>)

Jack, W8TEE

On Wednesday, May 27, 2020, 4:14:10 PM EDT, IK4JQQ <ik4jqq@...> wrote:


Great job Hans. Congratulations you deserve all this. Hope you'll sell 10,000 QSX very soon too!
Ciao!

Re: QCX vs. QCX+ Form Factor Question

Scott - N1ST
 

Hans,

Just to let you know that there are some out here whose radio will never leave the house, so bigger is better.  At least my mind.  :-)

Scott