Date   

Re: I need help

Matthew Halsey <rftb_cowboy@...>
 

I test with the MFJ cub first because it is only 1W and my least used rig.  It is pretty analog so easier to fix in the event I blow something up than the QCX.
Battery is on charge now.  I will check voltage when the smart charger says it is full.  I was reading a hair over 12v previously.

Matt

On Apr 1, 2020, at 3:47 PM, George Korper <georgekorper@...> wrote:

That could be it too, but if the antenna is the problem be really, really
careful so as not to blow the finals in the QCX. My Tarheel looked good
in a similar fashion but it was connected by a "hair' so to speak and I blew up
a lot of the transmitter section of the QCX when the hair disconnected!

On Wed, Apr 1, 2020 at 3:38 PM Don VE3IDS <ve3ids.don@...> wrote:
Matt
I think your battery is likely ok. If the rig transmits into a dummy load and you see that on your swr meter, it would seem that your antenna is the issue. Maybe there is a short in a connector or the balun. Almost any antenna will receive, the transmitter may not load into a bad impedance. Has the counterpoise come disconnected?
73 Don ve3ids

On Wed., Apr. 1, 2020, 3:28 p.m. Matthew Halsey via groups.io, <rftb_cowboy=yahoo.com@groups.io> wrote:
I am hoping someone here can help me out, I am at my wits end.

I have 3 QRP rigs, 2 QCX’s and an MFJ cub.
I have 2 SWR meters
I have a EFHW long wire with 49:1 balun
I have QRP-labs 10W dummy load.

All rigs receive fine on the antenna.
I cannot seem to get any rigs to show transmit levels on either SWR meter.
I cannot get full scale deflection on SWR except on dummy load.
I have connected my SDR to the long wire and I can see carriers when I key into dummy loads.

Why can I not get any power readings or SWR readings?
At this point, the only thing in common is the battery which I am using to run them.  It is still showing 12v and is an 8Ah SLA so I doubt its out of juice but I will put it on charge to confirm.

I dont know any local hams and they would all be locked down currently anyway so I am reaching out to this community in the hope that someone out there can help me.

regards
Matt
KC3OIV






Re: I need help

George Korper
 

That could be it too, but if the antenna is the problem be really, really
careful so as not to blow the finals in the QCX. My Tarheel looked good
in a similar fashion but it was connected by a "hair' so to speak and I blew up
a lot of the transmitter section of the QCX when the hair disconnected!

On Wed, Apr 1, 2020 at 3:38 PM Don VE3IDS <ve3ids.don@...> wrote:
Matt
I think your battery is likely ok. If the rig transmits into a dummy load and you see that on your swr meter, it would seem that your antenna is the issue. Maybe there is a short in a connector or the balun. Almost any antenna will receive, the transmitter may not load into a bad impedance. Has the counterpoise come disconnected?
73 Don ve3ids

On Wed., Apr. 1, 2020, 3:28 p.m. Matthew Halsey via groups.io, <rftb_cowboy=yahoo.com@groups.io> wrote:
I am hoping someone here can help me out, I am at my wits end.

I have 3 QRP rigs, 2 QCX’s and an MFJ cub.
I have 2 SWR meters
I have a EFHW long wire with 49:1 balun
I have QRP-labs 10W dummy load.

All rigs receive fine on the antenna.
I cannot seem to get any rigs to show transmit levels on either SWR meter.
I cannot get full scale deflection on SWR except on dummy load.
I have connected my SDR to the long wire and I can see carriers when I key into dummy loads.

Why can I not get any power readings or SWR readings?
At this point, the only thing in common is the battery which I am using to run them.  It is still showing 12v and is an 8Ah SLA so I doubt its out of juice but I will put it on charge to confirm.

I dont know any local hams and they would all be locked down currently anyway so I am reaching out to this community in the hope that someone out there can help me.

regards
Matt
KC3OIV



Re: #QCX40 Rev5 LCD contrast adjustment appears to cause massive current draw #qcx40

James Daldry W4JED
 

Hi, Paul

Sounds like you have the pot rotated 120 degrees in the board, and have the 5 volt supply between the wiper and one end of rotation. Either that or you have pin 3 and pin 2 shorted together on the display or the display socket. Check for the usual - stray wire clippings, solder splashes, robots hiding under the board, etc.

73

Jim W4JED

On 4/1/20 2:34 PM, Paul Burton wrote:
When I power up my newly built QCX40, I can see the normal boot-up text and then the band selection option as the first step in the first-run configuration. However, the contrast makes it quite difficult to read. When I adjust R47, however, there's no change in the contrast through most of the pot's travel, until suddenly it changes the contrast, and instantly the processor becomes unstable (usually reboots--showing the boot-up text again), and the voltage regulator gets really screaming hot as though it's sinking a lot of current. I've done my best to examine the board for cold/missed joints, bridges, etc., and I verified that the voltage regulator is putting out 5v (my input is a regulated 13.8v desktop supply), but I'm at a loss where to begin troubleshooting from there. The official troubleshooting guide and searches on the group haven't revealed anything quite similar enough to my situation to give me a nudge in the right direction.


Re: I need help

Roger Hill
 

Hi Matthew:

You say the battery is showing 12v...that sounds suspiciously close to 'flat'.
Try putting your voltmeter on the power connections to the QCX, say, and see what happens when you key up...I suspect it will fall to close to nothing.

Roger
G3YTN

---
***************************
Roger Hill
***************************

On 2020-04-01 15:28, Matthew Halsey via groups.io wrote:
I am hoping someone here can help me out, I am at my wits end.
I have 3 QRP rigs, 2 QCX’s and an MFJ cub.
I have 2 SWR meters
I have a EFHW long wire with 49:1 balun
I have QRP-labs 10W dummy load.
All rigs receive fine on the antenna.
I cannot seem to get any rigs to show transmit levels on either SWR meter.
I cannot get full scale deflection on SWR except on dummy load.
I have connected my SDR to the long wire and I can see carriers when I
key into dummy loads.
Why can I not get any power readings or SWR readings?
At this point, the only thing in common is the battery which I am
using to run them. It is still showing 12v and is an 8Ah SLA so I
doubt its out of juice but I will put it on charge to confirm.
I dont know any local hams and they would all be locked down currently
anyway so I am reaching out to this community in the hope that someone
out there can help me.
regards
Matt
KC3OIV


Re: I need help

Don VE3IDS
 

Matt
I think your battery is likely ok. If the rig transmits into a dummy load and you see that on your swr meter, it would seem that your antenna is the issue. Maybe there is a short in a connector or the balun. Almost any antenna will receive, the transmitter may not load into a bad impedance. Has the counterpoise come disconnected?
73 Don ve3ids

On Wed., Apr. 1, 2020, 3:28 p.m. Matthew Halsey via groups.io, <rftb_cowboy=yahoo.com@groups.io> wrote:
I am hoping someone here can help me out, I am at my wits end.

I have 3 QRP rigs, 2 QCX’s and an MFJ cub.
I have 2 SWR meters
I have a EFHW long wire with 49:1 balun
I have QRP-labs 10W dummy load.

All rigs receive fine on the antenna.
I cannot seem to get any rigs to show transmit levels on either SWR meter.
I cannot get full scale deflection on SWR except on dummy load.
I have connected my SDR to the long wire and I can see carriers when I key into dummy loads.

Why can I not get any power readings or SWR readings?
At this point, the only thing in common is the battery which I am using to run them.  It is still showing 12v and is an 8Ah SLA so I doubt its out of juice but I will put it on charge to confirm.

I dont know any local hams and they would all be locked down currently anyway so I am reaching out to this community in the hope that someone out there can help me.

regards
Matt
KC3OIV



Re: I need help

George Korper
 

Sounds like a bad battery. SLA batteries can do what you describe.
It can even show a false charge. I changed over to Lithium. 

On Wed, Apr 1, 2020 at 3:28 PM Matthew Halsey via groups.io <rftb_cowboy=yahoo.com@groups.io> wrote:
I am hoping someone here can help me out, I am at my wits end.

I have 3 QRP rigs, 2 QCX’s and an MFJ cub.
I have 2 SWR meters
I have a EFHW long wire with 49:1 balun
I have QRP-labs 10W dummy load.

All rigs receive fine on the antenna.
I cannot seem to get any rigs to show transmit levels on either SWR meter.
I cannot get full scale deflection on SWR except on dummy load.
I have connected my SDR to the long wire and I can see carriers when I key into dummy loads.

Why can I not get any power readings or SWR readings?
At this point, the only thing in common is the battery which I am using to run them.  It is still showing 12v and is an 8Ah SLA so I doubt its out of juice but I will put it on charge to confirm.

I dont know any local hams and they would all be locked down currently anyway so I am reaching out to this community in the hope that someone out there can help me.

regards
Matt
KC3OIV



Re: QCX 5W 40M Xcvr no BPF output

James Daldry W4JED
 

Hi, John

Try the SN74CBT3253CDR from DigiKey, stock number 296-19206-1ND which is 16 pin SOIC 5 volt, at a horrendous price of 60 cents. Since they have 5998 in stock they won't be running out right away. TI is still making the chip, but just with their own part number. Electrically identical to FST3253.

73

Jim W4JED

On 4/1/20 1:37 PM, John Morris wrote:
Haha good deal on the rosin smoke, Jim, as well as the "big brother"..
Yes, you do have to flood the device legs with the melted ChipQuick but it isn't really that much. Just looks like a lot. It works, though.
I went looking for that FST3253 and couldn't find it in the SOIC package. I checked both Mouser and Digikey.
Says it is obsolete. Do you know of any other sources?

John


I need help

Matthew Halsey <rftb_cowboy@...>
 

I am hoping someone here can help me out, I am at my wits end.

I have 3 QRP rigs, 2 QCX’s and an MFJ cub.
I have 2 SWR meters
I have a EFHW long wire with 49:1 balun
I have QRP-labs 10W dummy load.

All rigs receive fine on the antenna.
I cannot seem to get any rigs to show transmit levels on either SWR meter.
I cannot get full scale deflection on SWR except on dummy load.
I have connected my SDR to the long wire and I can see carriers when I key into dummy loads.

Why can I not get any power readings or SWR readings?
At this point, the only thing in common is the battery which I am using to run them. It is still showing 12v and is an 8Ah SLA so I doubt its out of juice but I will put it on charge to confirm.

I dont know any local hams and they would all be locked down currently anyway so I am reaching out to this community in the hope that someone out there can help me.

regards
Matt
KC3OIV


Re: Source of IC4 - FST3253 for QCX - 5W

Ronald Taylor
 

On Wed, Apr 1, 2020 at 11:21 AM John Morris <k7rld@...> wrote:
I have found a defective IC4 - FST5253 IC on my resurrected QCX40.
I've searched all the usual supply houses and the SOIC version seems to be obsolete. Only the TSSOP version is available.
Ebay shows some from China but unless someone can point to a good Chinese source, that is not workable.

Sorry if this has been addressed previously.

John / K7RLD


Re: GPS Port Bama Enclosure

scot forshaw
 

I’m in the process of modelling a custom 3D Printed GPS connector with dust cover. If anyone has a wish list or input at this stage then please share it. 

Scot
2E0WWV 


On 31 Mar 2020, at 12:09, q q via Groups.Io <bzmdrc@...> wrote:


This is the plug and socket I use is a Winchester Connector model M5S

I have them on my U3S, QCX and my Bitx40 with QRP Labs VFO.

This way I can use the same GPS with each rig

Never an issue.

Bob
W1EXZ


Re: #QCX40 Rev5 LCD contrast adjustment appears to cause massive current draw #qcx40

Alan G4ZFQ
 

until suddenly it changes the contrast, and instantly the processor becomes unstable (usually reboots--showing the boot-up text again), and the voltage regulator gets really screaming hot
This seems to indicate a short between pins 2, 3 of R47. It is shorting the 5V line to ground.

73 Alan G4ZFQ


Re: 80 meter cw rig #80m

George Korper
 

TNX. I will follow your instructions.


On Wed, Apr 1, 2020, 12:44 PM Richard Hall <n76003@...> wrote:
I finished my 80 meter QCX last week without a problem. I used the alternate technique for T1: wind the big secondary in a single layer all the way around and then the other windings on top. I also wound 71 turns as I figured it would be easier to remove turns than to add. I ended up with 69 turns.
80 is noisy. You should be prepared for that. I am having good luck with a receiving antenna: https://www.qsl.net/kc2tx/loopschematic.htm and pre-amp: http://www.mtmscientific.com/preamp.html
I have ordered the 50W PA and will build it for 80. Barefoot, I have reached Mexico and Oregon from Burbank, CA.
Richard
NS3C


Re: 80 meter cw rig #80m

Richard Hall
 

I finished my 80 meter QCX last week without a problem. I used the alternate technique for T1: wind the big secondary in a single layer all the way around and then the other windings on top. I also wound 71 turns as I figured it would be easier to remove turns than to add. I ended up with 69 turns.
80 is noisy. You should be prepared for that. I am having good luck with a receiving antenna: https://www.qsl.net/kc2tx/loopschematic.htm and pre-amp: http://www.mtmscientific.com/preamp.html
I have ordered the 50W PA and will build it for 80. Barefoot, I have reached Mexico and Oregon from Burbank, CA.
Richard
NS3C


#QCX40 Rev5 LCD contrast adjustment appears to cause massive current draw #qcx40

Paul Burton
 

When I power up my newly built QCX40, I can see the normal boot-up text and then the band selection option as the first step in the first-run configuration. However, the contrast makes it quite difficult to read. When I adjust R47, however, there's no change in the contrast through most of the pot's travel, until suddenly it changes the contrast, and instantly the processor becomes unstable (usually reboots--showing the boot-up text again), and the voltage regulator gets really screaming hot as though it's sinking a lot of current. I've done my best to examine the board for cold/missed joints, bridges, etc., and I verified that the voltage regulator is putting out 5v (my input is a regulated 13.8v desktop supply), but I'm at a loss where to begin troubleshooting from there. The official troubleshooting guide and searches on the group haven't revealed anything quite similar enough to my situation to give me a nudge in the right direction.


Source of IC4 - FST3253 for QCX - 5W

John Morris
 

I have found a defective IC4 - FST5253 IC on my resurrected QCX40.
I've searched all the usual supply houses and the SOIC version seems to be obsolete. Only the TSSOP version is available.
Ebay shows some from China but unless someone can point to a good Chinese source, that is not workable.

Sorry if this has been addressed previously.

John / K7RLD


Re: No clock w output

Gordon Burdo
 

QCX not QSX....sorry.  I solder about as well as I spell.


Re: QCX 5W 40M Xcvr no BPF output

George Korper
 

John,
Please write me. 

Thanks,
K3GK

On Wed, Apr 1, 2020 at 1:37 PM John Morris <k7rld@...> wrote:
Haha good deal on the rosin smoke, Jim, as well as the "big brother"..
Yes, you do have to flood the device legs with the melted ChipQuick but it isn't really that much. Just looks like a lot. It works, though.
I went looking for that FST3253 and couldn't find it in the SOIC package. I checked both Mouser and Digikey.
Says it is obsolete. Do you know of any other sources?

John


Re: QCX 5W 40M Xcvr no BPF output

Ronald Taylor
 

John, the last ones I got, I had to go to ebay. Looks like a lot of choices still there. Search FST3253 SOIC 

Ron

On Wed, Apr 1, 2020 at 10:37 AM John Morris <k7rld@...> wrote:
Haha good deal on the rosin smoke, Jim, as well as the "big brother"..
Yes, you do have to flood the device legs with the melted ChipQuick but it isn't really that much. Just looks like a lot. It works, though.
I went looking for that FST3253 and couldn't find it in the SOIC package. I checked both Mouser and Digikey.
Says it is obsolete. Do you know of any other sources?

John


Re: QCX 5W 40M Xcvr no BPF output

John Morris
 

Haha good deal on the rosin smoke, Jim, as well as the "big brother"..
Yes, you do have to flood the device legs with the melted ChipQuick but it isn't really that much. Just looks like a lot. It works, though.
I went looking for that FST3253 and couldn't find it in the SOIC package. I checked both Mouser and Digikey.
Says it is obsolete. Do you know of any other sources?

John


No clock w output

Gordon Burdo
 

Hello all,
I just assembled a QSX - 30.  There is no RF output and I traced it back to the osc. chip (clock 2)  No error codes show up so the processor is talking to the RF chip. Note, I accidentally burned up the oscillator and processor chips and replaced both.  (I used the synth board for the oscilllator)  I was troubleshooting this problem when I burned up the chips.   Any ideas?
Thanks,
Gordy WA2RUP