Date   

Re: 2 x 20m WSPR/QRSS balloons launched back to back

Jim .....
 

I am relieved...new telemetry just in that shows 9580m altitude...this is good and about where it was predicted to be...and then some.
Also...Hans special telemetry software for balloons -


Re: Power supply for clock kit #clock #supply

ewsjts@...
 

Hi Dave,
I've been using TDK/Lambda supplies.  Small size, excellent regulation and low/no noise.  Mains voltage, 100 - 240 VAC. Around 18 dollars US from Newark (Farnell in your case I guess).  Model LS5-5 (5 VDC (adjustable) @ 5A)).
Ed.
WA4MZS 


Re: 2 x 20m WSPR/QRSS balloons launched back to back

Jim .....
 

2 spots in and it is indeed GN44 grid.
Sadly,altitudes are showing 6600m...but DFCW now showing what looks like 9200m or so.
Need more WSPR decodes.
Got a pretty good lock on both transmitters now on my grabber -
Will need some expert DFCW guys for these :)
https://www.qsl.net/n2nxz/hf1.jpg


Re: Replacement part for IC4 #fst3253

James Daldry W4JED
 

Hi, Wes

Found it on thepartsplace.k5nwa.com for 70 cents.

Jim W4JED

On 2/4/19 4:45 PM, Wes wrote:
Has anyone found a source for the SOIC footprint version of IC4, the FST3253? I have a unit on the bench with overheating of the 5v regulator, and it appears that IC4 is drawing excess current. Static measurement shows ~140 ohms VCC to ground. Everything else checks OK on the 5V bus. 
--
> I finally got it all together...now I can't remember where I put it<

VY 73,
Wes

AE6ZM

Sierra Vista, AZ

 


Re: Multi turn resisters 20K included with kit

Hans Summers
 

Hi Andrew

It was a supplier error on a few kits about a year ago... see http://www.qrp-labs.com/qcx/qcxfaq.html#203 and let me know if you need me to send you two 50K resistors or if you want to do the modification. 

73 Hans G0UPL


On Tue, Feb 5, 2019 at 6:58 PM ANDREW STEEN <n2gff@...> wrote:

Good morning all, nice to join the group.

My question is in regards to the 2 multi turn resisters that are stated as 50K (503).

The two in my kit are labeled 203 (20K),

I have the 80M kit.

Is this a change?

I don’t want to install, as removal is a b**ch😊

Thanks,

Andrew

K6STN

 

Sent from Mail for Windows 10

 


Multi turn resisters 20K included with kit

ANDREW STEEN
 

Good morning all, nice to join the group.

My question is in regards to the 2 multi turn resisters that are stated as 50K (503).

The two in my kit are labeled 203 (20K),

I have the 80M kit.

Is this a change?

I don’t want to install, as removal is a b**ch😊

Thanks,

Andrew

K6STN

 

Sent from Mail for Windows 10

 


Re: 2 x 20m WSPR/QRSS balloons launched back to back

Jim .....
 

May or not be proper grid locator...need better signals.


Re: Replacement part for IC4 #fst3253

Wes AE6ZM
 

Some decades back when there was still a lot of equipment using vacuum tubes (valves) a common phrase heard in tech chat was "solid state`. We were aware of a phenomenon related to "SS" that we called "infant mortality", meaning that if a SS device were going to fail it would happen soon after it was put into service. The perception was that if it survived the "infant" period, it would last forever. A perception likely resulting from the reality that the vacuum tube started dying the moment you put it into sevice, and would certainly fail after a few hours of service, 'few' being relative to the life expected from these 'new fangled' SS things. Truth is, SS devices do not last forever, and as you said, internal weakness may be one of the causes. Having a lot of our equipment connected to impulse collectors (antennae) may also play havoc. In some cases it could be technician oops'es.
--
> I finally got it all together...now I can't remember where I put it<

VY 73,
Wes

AE6ZM

Sierra Vista, AZ

 


Re: 2 x 20m WSPR/QRSS balloons launched back to back

Jim .....
 

I managed to find a remote receiver here in NY that has a HEX beam,getting great signals but no WSPR decodes.
However,I think I was able to make out the DFCW grid locators of both transmitters.
Drift is so bad,but best I can see so far...unless someone else has a better eye than me for this sort of mode.
But it does look about right according to previous flights in regard to the location.
Both transmitters start off with QRSS ID - "U3S" followed by grid/altitude.
The tracker with GPS issue still reads FN13CH where it left the ground here at home.


Re: Replacement part for IC4 #fst3253

M0RON
 

Hi Alan, 
Definitely the chip. 
Qlg1 was attached to a u3s and was working fine for weeks. Then it suddenly stopped, u3s still running, 5v very well regulated supply. I initially thought it was the rf chip but I probed the input to the chip from the rf chip and it was definitely receiving signals from the rf chip, the output however was a constant 2.34v or something around there on both outputs pins 3 and 8. Consequently pins 4,5,12 and 13 were fed a constant voltage which meant that the green led was constantly on and the yellow led never lit. Removed chip without damaging the board, soldered in a socket, replacement chip and all was good again and still is.
No voltage spike or incorrect voltage applied, it just failed, must have been an internal fault,  I destroyed the chip to remove it from board so didn't check it further. Just one of those unexplained failures, though I must say that I haven't had any other IC's from anything else I've built fail so one chip isn't bad and nothing else was damaged. 
Andy
--
The universe is made up of Protons, Neutrons, Electrons but contains only one M0RON.


Re: QRP Guys are OK

Braden Glett
 

I just ordered a QRP trap antenna with built-in tuner and SWR indicator from them, yesterday. I understand that they can be a little slow but they are performing a great service to the QRP Ham community for little reward. God bless them all. 


Re: New 20 Meter QCX failure

James Daldry W4JED
 

Hi, Floyd

Pin 8 of IC3 is connected by R43 to the antenna jack. It is the source of the signal you use to align the bandpass filter and the sideband filter. Being that it is shorted to ground would indicate either a shorted IC or a wire clipping, solder whisker, etc shorting the pin to ground. If it is a shorted IC, it could either be an early-life failure (the reason for 90 day warranties) or something overloaded / overvoltaged the IC and blew it. In the first case replacing the IC will fix the set. In the second case replacing the IC wil result in failure of the replacement.

Looking at the schematic we have one connection to IC3 that appears capable of damaging the IC - the one to Q1 thru Q3, pin 3 of IC3. Since the IC is shorted it needs to be removed before any further testing can be done. This can be done with either (a) solder wick, extra solder, patience, and care or (b) a desoldering tool like the Velleman desoldering pencil that's $10.45 on Amazon. Once you have the IC out, check the resistance from the pin 3 hole of the board to ground and to the collector of Q6. If either reading is less than infinite you need to replace Q1, Q2, Q3, and Q6 as well as IC3. Since you had low power before the failure, you might want to replace C25 and 26 while you're at it.

The 74ACT00N is identical to the 74ACT00NG which Arrow has 24000 of at 18 cents each, free overnight shipping.

Jim W4JED

On 2/4/19 4:43 PM, Floyd Abrames wrote:
My recently finished QCX 20 failed after maybe 30 minutes of use.  The only problem at that time was the common one of low power.  I was studying the testing procedures when the lcd display went blank.  I happened to touch the 7805 voltage regulator and it was extremely hot.  I took power off immediately.  No smoke or burned smell. I put a ampmeter in line and added power just long enough to get a reading which was 600ma.  Not wanting to burn up the 7805 I did some checking power off.  I found resistance from 5volt supply to ground to be 14 ohms and pin 8 of IC3 was 1 ohm to ground.  Pin 8 has a short lead to R43 {120K).  I looks to me that IC3 has failed internally. IC2 controls the lcd so it may have died.  The lcd was checked on an arduino and is ok.  I hate to change IC3 but looks like the best starting place.
I can find no supplier for the 74ACT00N.  Any help?  Any disagreement with my logic?  
Thanks for any help

Floyd AA0GU


Re: QCX kit -- Use of IC Sockets

Steve Nichols
 

Hi Al,

I used sockets on mine, mainly because I had to cut out one of the chips after a failure and didn't want to have to do that again!

I haven't noticed any extra noise etc. I think that Hans was concerned that sockets could just introduce another potential source of bad connections.

Steve G0KYA


Re: Power supply for clock kit #clock #supply

Art N4EZZ
 

I have used a power supply obtained from Jameco as well but a slightly
different one.

Their part number is #1919043. I went for something hard wired to reduce
the potential for errors in the future. Lots of choices.

Have fun with it, I am waiting on my next kit an Ultimate3S.

Art N4EZZ <n4ezz@...>
GnuPG key ID 0x6712DD0E
=============================
"Wink at small faults; remember thou hast great ones."
BENJAMIN FRANKLIN, Poor Richard's Almanack, 1738

On 2/5/19 6:46 AM, Curt M. wrote:
I've built two clock kits and I'm using a Jameco 1953612 to power each of them.  One of them has been on 24/7 since I built it.

If you give Jameco your email address I think they will give you $10 off your order.

https://www.jameco.com/z/DDU050100M2270-AC-DC-POWER-SUPPLY-WALL-ADAPTER-TRANSFORMER-SINGLE-OUT-5V-1A-5W_1953612.html




Re: Power supply for clock kit #clock #supply

Roger Hill
 

Hi Dave

Don't chop the plug off. Get yourself a suitable chassis-mounted power socket to match the plug. Wire that to the clock. Then you can use the power supply on more than one item of kit.

I used a raspberry pi supply rated at 2.5 amps..and fitted my own plug to match the socket I had.

Roger

Roger


On 5 February 2019 13:32:31 GMT+00:00, "Dave Capstick via Groups.Io" <cappers1001@...> wrote:
Hi All,
first time post and a relative newbie to construction.  I've recently purchased 3 kits to get me going, these are:
- clock kit
- QLG1 GPS kit
- QCX80

I've eventually got round to building the first one of these (clock kit) and i was wondering what other people have used as a power supply and how they've connected this up to the clock power pins?  The manual states that you should use a well regulated power supply - what's considered well regulated? Also, most of these end up with a barrel type socket at the end, do you simply cut this off and solder on a connection pin, like you have with jumper cables?  How about a 5v battery?  I have one that i use to power a raspberry pi, but that has a usb socket - so would i have to split the cable and again connect the ends up to a jumper cable.
I'm sure this is a really simple job, but i just need to clarify what the best solution might be

Thanks for your help

Dave
M0IKT

--
Sent from my Android device with K-9 Mail. Please excuse my brevity.


Re: IMHO a great YouTube video on understanding toroidal cores

 

W0QE, Larry's videos are very good. He has a firm understanding of RF and SimSmith and he presents the info in an understandable way.
--
73
NE5U

Mike


Re: Power supply for clock kit #clock #supply

Curt M.
 

I've built two clock kits and I'm using a Jameco 1953612 to power each of them.  One of them has been on 24/7 since I built it.

If you give Jameco your email address I think they will give you $10 off your order.

https://www.jameco.com/z/DDU050100M2270-AC-DC-POWER-SUPPLY-WALL-ADAPTER-TRANSFORMER-SINGLE-OUT-5V-1A-5W_1953612.html 


Power supply for clock kit #clock #supply

Dave Capstick
 

Hi All,
first time post and a relative newbie to construction.  I've recently purchased 3 kits to get me going, these are:
- clock kit
- QLG1 GPS kit
- QCX80

I've eventually got round to building the first one of these (clock kit) and i was wondering what other people have used as a power supply and how they've connected this up to the clock power pins?  The manual states that you should use a well regulated power supply - what's considered well regulated? Also, most of these end up with a barrel type socket at the end, do you simply cut this off and solder on a connection pin, like you have with jumper cables?  How about a 5v battery?  I have one that i use to power a raspberry pi, but that has a usb socket - so would i have to split the cable and again connect the ends up to a jumper cable.
I'm sure this is a really simple job, but i just need to clarify what the best solution might be

Thanks for your help

Dave
M0IKT


Re: 2 x 20m WSPR/QRSS balloons launched back to back

Jim .....
 

Now just need some WSPR spots for telemetry !



Re: 2 x 20m WSPR/QRSS balloons launched back to back

Jim .....
 

rellekevets - Yes,you can go here and see details of payloads and balloons.Everything you need is there -
http://radio-signals.com/forum/
There is a lot there to look over and get familiar with designs.
Drop me an email anytime...QRZ.com email good.
WD4AH once again is hearing BOTH signals this morning...just amazing and one heck of a receiver he has there!!
Thank you Al...you made my day.
Jim,N2NXZ