Re: Final assembly of 10w amplifier kit
I mentioned this last October.? My PCB was down as far on the legs of the FET's as possible.? I just turned up a spacer to even the height. A suitable washer under the nut would work also.
glenn
vk3pe
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Re: WSPR with the QCX - getting the time right
#wspr
#160m
Wspr needs to tx on a 2 minute slot.
The slots MUST be at either 2,4,6,8 etc mins past the hour. You CANNOT have a
tranmision starting on a 1,3,5,7 mins
past the hour.
73 de Andy
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Re: WSPR with the QCX - getting the time right
#wspr
#160m
Set the time on QCX to WWV.? The QCX displays the time to the second, and it is set to within a half second to WWV.? Good enouf.
About the frequency, I set the 40 meter QCX WSPR frequency to 7.04096 which is very close to the middle of the 200 hz band.? Should be good enough but I can't really tell how good the display frequency is with respect to wspr.?
I think that I have everything set up correctly, 10 minutes span, frequency, time is set, my call and grid and power is set to 33.? But I am still waiting to see my call on wsprnet.com? ?Is there some way to check the correct frequency display???
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Re: Final assembly of 10w amplifier kit
Re the IRF510s full through the board?? The face or the irf510 should be almost
flush to the board.? If you have leads or other things in the way that can't happen.
I've built 4 not something I've seen.
Allison
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Re: Final assembly of 10w amplifier kit
Just checked mine and it is about 5mm at both ends of the board
give so your problem is at input end of board. This is the end
where the spacer nut is. Check thickness of nut, it is specified
in the parts list as being 4.4 mm thick so you are 1mm out. The
electrons won't mind going uphill but you may run the risk of
physically stressing the board.
On 3/28/2019 7:38 PM, Charles W. Powell
via Groups.Io wrote:
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I have completed all but the final assembly of the 10w PA board.
?I put the IRF510 FETs on the heat sink and put everything else in
place. ?The PCB does not sit level above the heat sink, even with
the large nut in place. ?On the IRF510 side the board is 5mm above
the heat sink. ?At the other end it's 3.5 to 4mm. ?
So here's the question: Is this what others have seen? ?Do I need
a shim to level out the board? ?Any suggestions on what to use as
a shim? Does it really matter?
72,
Charles - NK8O
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Re: Balloon and similar payload electronics and conformal coating
Good advice Doug, thank you.
cheers, Graham ve3gtc
On 3/28/2019 11:14, k6sts via Groups.Io
wrote:
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Regarding conformal coatings, keep in mind that all the Max
GPS series modules I am aware of are NOT hermitically sealed.
They have a warranty period and some can be repaired. Usually
for the way we use them being unrecoverable, the warranty is
not an issue, but if you spray something on the module and it
gets inside through the tiny holes surrounding the top cover
is can cause the module to have problems.
Ublox specifically states in the datasheet not to conformal
coat the module
If you choose to conformal coat the PCB, mask off the Ublox
first.
Regardless of the components you use, it's a good idea to
read and understand? the individual datasheets of the
components to avoid simple issues like this.
In my experience, just because you unknowingly got away
with something and it worked, doesn't mean you did everything
wright. Just my 2 cents worth.
Doug ?? k6sts
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Re: 20m QCX RF Output Question
#qcx
I went ahead and took off two turns from L1 and L3 and it made no difference at all. I guess I need to keep fiddling with it.
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Re: 20m QCX RF Output Question
#qcx
I removed 1 turn each and got about an additional 500mw.
73 Vince N1VIN
On 3/28/2019 1:50 PM, KT4RK wrote:
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Hi all. I just finished my first QCX build for 20m and I¡¯m curious
about the power output. I¡¯m currently getting around 2.5 watts RF
output based on the readings provided by the QCX menu 9.2. After
reading some other threads, it seems it¡¯s possible to increase the
power output by removing turns from the L1, L2, and L3 toroids. My
question is: what sort of increase I should expect? I¡¯m trying to
decide if it¡¯s worth the trouble to do the modification if I¡¯m
only going to get a few mW difference. Any other suggestions are
appreciated.?
de KT4RK?
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Re: Final assembly of 10w amplifier kit
Just checked mine and the PC board is the same distance from the heat sink on both ends. On the FETs did you did you bend the leads right where they leave the body or at the standoff step down on the leads?
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Final assembly of 10w amplifier kit
I have completed all but the final assembly of the 10w PA board. ?I put the IRF510 FETs on the heat sink and put everything else in place. ?The PCB does not sit level above the heat sink, even with the large nut in place. ?On the IRF510 side the board is 5mm above the heat sink. ?At the other end it's 3.5 to 4mm. ?
So here's the question: Is this what others have seen? ?Do I need a shim to level out the board? ?Any suggestions on what to use as a shim? Does it really matter?
72,
Charles - NK8O
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20m QCX RF Output Question
#qcx
Hi all. I just finished my first QCX build for 20m and I¡¯m curious about the power output. I¡¯m currently getting around 2.5 watts RF output based on the readings provided by the QCX menu 9.2. After reading some other threads, it seems it¡¯s possible to increase the power output by removing turns from the L1, L2, and L3 toroids. My question is: what sort of increase I should expect? I¡¯m trying to decide if it¡¯s worth the trouble to do the modification if I¡¯m only going to get a few mW difference. Any other suggestions are appreciated.?
de KT4RK?
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Hi Dennis
The PCBs cleared customs yesterday. It normally takes 3 days to reach us via a domestic courier?service. So Monday we will start shipping out the pending orders.
73 Hans G0UPL? ?
getting curious about delivery time
Dennis
AG4TD
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Dennis, my QCX to Colorado took 16 days.
Gary W0CKI
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-----Original Message-----
From: dkwflight <dkwflight@...>
To: QRPLabs < [email protected]>
Sent: Thu, Mar 28, 2019 10:04 am
Subject: Re: [QRPLabs] Kit ordered
getting curious about delivery time
Dennis
AG4TD
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Re: Ammo can QCX Antenna testing today. 1st run.
#40m
#qcx
Hello George, unfortunately,? I just took the station down, I moved into the garage, but my sinuses are going crazy, and I have a doctor's appointment & CT scan tonight, so for the day I'm QRT ....hopefully we will cross paths again soon.?
Steve Raas?
N2JDQ?
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Re: #QSX suggestion: E-ink display?
#qsx
Not at all.
In the photo, the Receive menu option has the Morse Code Trainer (MCT) able to send Letters, Numbers, Punctuation, Words, Letters and Numbers, Call Signs, and a mock QSO. All are randomly generated so you can't memorize them. The mock QSO generates what might be the content of a? "typical" QSO and includes randomly generated signal and weather reports, names, QTH, antennas, rigs, etc. Sending is done via the Koch Method with a little Farnsworth blended in. For example, if you hope to reach 30wpm, the Koch method starts you at 30wpm, which is just over two letters per second. This forces you to listen to the rhythm of the letter instead of counting dits and dahs and then translating it. The Farnsworth Method simply means an exaggerated spacing is used between letters. A beginner might have a target speed of 30wpm, but use a Farnsworth spacing of 5wpm. This gives the user over 2 seconds between letters.
Those speeds (as well as sidetone, encoding type, and paddle reversal) are set using the Config menu. Those values are stored in EEPROM. The Send method has you listen to characters and then send them back using a paddle. There's a Flashcard option that sends a letter, flashes on the display, and waits for you to send it. The CopyCat option sends a random call sign and waits for you to send it back...correctly. If no menu option is selected, you can use it as a code practice oscillator. It has a 3W audio amp in it, so it could be used for a CPO in a classroom.
The display does have an SD card reader on the back, so it is possible to have Gone With The Wind in ASCII on the SD and listen to it in CW as you make that long drive between NYC and LA. I have not implemented that...yet. If you don't have a junk box, the cost should be under $20. I'm making it open source.
Jack, W8TEE
On Thursday, March 28, 2019, 11:59:44 AM EDT, gerrykav via Groups.Io <gerrykav@...> wrote:
Do you mind if I ask for some details on the morse code trainer, Jack?
/ Gerry
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Re: Ammo can QCX Antenna testing today. 1st run.
#40m
#qcx
Steve, I will be on 7030 in a few minutes. 72 George/W2BPI
Sent from my Samsung Galaxy smartphone.
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-------- Original message -------- From: Steve Raas - N2JDQ - FN13DD <sjraas@...> Date: 3/28/19 08:51 (GMT-05:00) Subject: Re: [QRPLabs] Ammo can QCX Antenna testing today. 1st run. #40m #qcx
With cold fingers and some coffee, I'm setting back up on the patio this morning. Dependant on other stations, I should be back on the air within an hour if any one wants to try & work me. 7.030 area and I should pop on the reverse beacon network hopefully. Steve Raas? N2JDQ?
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getting curious about delivery time
Dennis
AG4TD
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Re: #QSX suggestion: E-ink display?
#qsx
Do you mind if I ask for some details on the morse code trainer, Jack?
/ Gerry
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Power out seems a bit low... any suggestions ?
I eventually got around to fixing my faulty volume pot last night and now everything works great... except, I'm only getting about 2.2W out (as measured by both the rig built-in meter and the external SWR / power meter).
This is from about 13V power supply. I'm not sure if this is normal for the 20m version at that voltage or if something is wrong... and I'm not sure where to start troubleshooting if there is a problem. Any suggestions ?
73,
Stephen. VE6SVJ
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Re: Ammo can QCX Antenna testing today. 1st run.
#40m
#qcx
I set everythibg up, but its simply too chilly to sit and be stationary, so im going to wait a little bit in the hopes that it warms up to a tolerable temp.
Steve Raas?
N2JDQ?
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Joe Cotton
KT4RK
N3MNT
jjpurdum
Stephen VE6SVJ