Date   

Re: PA for qcx 40m #qcx40

Darren KN4WML
 

I'm going to try the RBN later on this evening, and see what happens. Hopefully I can get some results on this issue. If not I'll go through the installation again to see if I fumbled something around


On Sun, Jun 7, 2020, 6:48 AM Don VE3IDS <ve3ids.don@...> wrote:
Darren

Go to reverse beacon network and search for your call sign after calling CQ a few times. You will see where your signal is being heard. 

73 Don ve3ids

On Sat., Jun. 6, 2020, 11:07 p.m. Gary Bernard via groups.io, <garybernard2=aol.com@groups.io> wrote:
The antenna should be fine. You don’t perchance have your rig on practice mode?


On Jun 6, 2020, at 8:46 PM, Gary Bernard via groups.io <garybernard2=aol.com@groups.io> wrote:

What kind of antenna are you using?


On Jun 6, 2020, at 7:28 PM, Darren KN4WML <darrent78@...> wrote:

Question from a newcomer.   With the 40m qcx, would it be helpful to add on a PA to this kit?  I have an average ant up about 30+- feet in the sky. I receive pretty well in the evenings but I don't seem to be getting any responses back.   I'm thinking I don't have enough powertpower get out?

Darren
KN4WML,


Re: PA for qcx 40m #qcx40

Don VE3IDS
 

Darren

Go to reverse beacon network and search for your call sign after calling CQ a few times. You will see where your signal is being heard. 

73 Don ve3ids

On Sat., Jun. 6, 2020, 11:07 p.m. Gary Bernard via groups.io, <garybernard2=aol.com@groups.io> wrote:
The antenna should be fine. You don’t perchance have your rig on practice mode?


On Jun 6, 2020, at 8:46 PM, Gary Bernard via groups.io <garybernard2=aol.com@groups.io> wrote:

What kind of antenna are you using?


On Jun 6, 2020, at 7:28 PM, Darren KN4WML <darrent78@...> wrote:

Question from a newcomer.   With the 40m qcx, would it be helpful to add on a PA to this kit?  I have an average ant up about 30+- feet in the sky. I receive pretty well in the evenings but I don't seem to be getting any responses back.   I'm thinking I don't have enough powertpower get out?

Darren
KN4WML,


Re: Polyphase board

Hans Summers
 

Hi all

Attachments show measurements I performed here during development of these kits. 

"response.gif" and "unwanted.gif" show USB and LSB (unwanted) audio response of the receiver module and polyphase module. It isn't bad for SSB. These are in the manual.

"transformer.gif" shows my measurements of the 600:600-ohm isolation transformers. They were better than I had expected. Even down at 100Hz and up above 10kHz.

73 Hans G0UPL 

On Sun, Jun 7, 2020, 01:22 ajparent1/KB1GMX <kb1gmx@...> wrote:
1800hz, no idea where you get that.

See the plots on the stor page   http://qrp-labs.com/polyphase.html

It mentions to 1800 hz for things like WSPR and other digital modes but
the board does as shown.

1800hz for SSB  would be on the narrow side.  But thats not the intended application
other than incidental.  Tweaking the Polyphase alone likely will not get you what
you want as its mostly GIGO.

The yabut is the 4 caps I mentioned last time and that also colors the bandwidth
as will the output transformers.

So the QDS detector caps C3-6 must be smaller.
Also the bandwidth of the 600ohm transformer will be only as specified if loaded
to 600 ohms, even then there will be significant roll off under 300hz and likely
the high side too.  They are designed to old school hard-copper telephone
bandwidth (not Iphone) is 200hz at the low end is maybe about it.

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


FST3253 Failure?

Mike Easterbrook
 

Hi All

Managed to resolve the key envelope problem with QCX 20 by replacing Q6.  TX now all OK and envelope looks good.
However at 13v current is now 200mA versus (110mA before the Q6 surgery) and lots of noise in the headset. 

T1 volts @ pins 5-6 (& IC4 pins 7 & 9) all 2.46. 5V rail is 4.91

C43-46 & IC5 all pins except 4 & 8 are approx. 0.9 V

The Q6 job involved some component bending but everything around R1 & R2 looks OK.  Suspect IC4 but looking for some confirmation or less radical suggestions before trying to replace.

Thanks
Mike 9M2LXM


QCX-20 Rev3 Low Output (2.3W) and dissonance

Bill NF6R CA
 

Hello,

I've been reading threads here and Han's low power article, and I'm working through them.  Continuity good through LPF, resolder caps 25-30, power doesn't climb when the key is held (but it does drop 0.2 watt).  Took one wrap off L1 and L2, two wraps off L3.  Stretched windings on L1 and L3, squeezed on L2.  Using the internal power meter, I can get it up to about 2.3W without problems.  If I go any higher, I get a dissonance in the 700Hz tone about 0.5 second after key down and Q1-3 get hot fast.  I can order and changes caps 25 and 26, but the dissonance issue doesn't seem to come up.

Another question, I've seen Allison mention the L4/C30 tuned circuit at 14.030.  Is that one of the alignments or is that just in the design?

Thanks for your help,

--

Bill - NF6R
SKCC 20696 NAQCC 9984 FISTS 19479 CalQRP 78 Flying Pigs 4181


Re: QCX 40 meter build help, 700 HZ tone shows up in weird place... #40m #si5351a

Mark Garrisi
 

I checked continuity between R43 through C29 and it's good.  De-soldered IC3 carefully with braid and resoldered.  I do have an .69 watt output, but have 5.2 watts showing  at C29.  I'm tired now, 1 am in Detroit.  I'll tackle more tomorrow, I'll do more work in the LPF chain.  Still have same problem.  Yes, I do have tone at pin 8 when I touch it with probe.  Will update as I go.
Tnx Wes.  


Re: PA for qcx 40m #qcx40

Darren KN4WML
 

I'm going to do more looking into to all these options I've gotten from everyone one. I need to learn more about the WSPR & beacons settings on it. I reckon I just need to be a little more patient, I'd assume.    And yes it's in the cw mode, not practice. 
 
Thanks for the suggestions, 
Darren,
KN4WML,


Re: PA for qcx 40m #qcx40

Bill Cromwell
 

Hi,

RBN *can* be a useful tool. There have been times I can hit several of those and get no QSO. There are times when no RBN station reports me BUT I get a qso pretty quickly. So, useful as RBN is the results are not chiseled in granite.

73,

Bill KU8H

bark less - wag more

On 6/6/20 11:01 PM, Gregg Myers wrote:
Hi Darren,
I looked on the Reverse Beacon Network for your callsign and don’t see anyone spotting you. So with the beacon stations at least, I see no indication you are getting out. If you are not familiar with the Reverse Beacon Network,  all you have to do is call CQ in the normal way (also de your callsign, of course) and you can look online and see if any of the ‘skimmers’ picked up your signal. As long as you are sending reasonably good CW, there are some very good systems around the country that are quite sensitive and will pick up your signal and report the signal strength. The link is here:
http://www.reversebeacon.net/main.php
If you don’t have another radio, you could also pull up a close by webSDR radio online and see if you can hear yourself sending.
Good Luck & 73,
Gregg
On Sat, Jun 6, 2020 at 8:46 PM Gary Bernard via groups.io <http://groups.io> <garybernard2@... <mailto:aol.com@groups.io>> wrote:
What kind of antenna are you using?

On Jun 6, 2020, at 7:28 PM, Darren KN4WML <darrent78@...
<mailto:darrent78@...>> wrote:

Question from a newcomer.   With the 40m qcx, would it be helpful
to add on a PA to this kit?  I have an average ant up about 30+-
feet in the sky. I receive pretty well in the evenings but I don't
seem to be getting any responses back.   I'm thinking I don't have
enough powertpower get out?

Darren
KN4WML,


Re: PA for qcx 40m #qcx40

Gregg Myers
 

Darren,

For a reference for you, my wire antenna is 23 feet in the air and I just called CQ one time with 3 watts on 7046. You can see I had 3 hits on the Reverse Beacon Network. It’s a really nice tool to see if your signal is getting out.

73,
Gregg



On Sat, Jun 6, 2020 at 9:01 PM Gregg Myers via groups.io <gregg.w7grm=gmail.com@groups.io> wrote:
Hi Darren,

I looked on the Reverse Beacon Network for your callsign and don’t see anyone spotting you. So with the beacon stations at least, I see no indication you are getting out. If you are not familiar with the Reverse Beacon Network,  all you have to do is call CQ in the normal way (also de your callsign, of course) and you can look online and see if any of the ‘skimmers’ picked up your signal. As long as you are sending reasonably good CW, there are some very good systems around the country that are quite sensitive and will pick up your signal and report the signal strength. The link is here: 

If you don’t have another radio, you could also pull up a close by webSDR radio online and see if you can hear yourself sending.

Good Luck & 73,
Gregg

On Sat, Jun 6, 2020 at 8:46 PM Gary Bernard via groups.io <garybernard2=aol.com@groups.io> wrote:
What kind of antenna are you using?


On Jun 6, 2020, at 7:28 PM, Darren KN4WML <darrent78@...> wrote:

Question from a newcomer.   With the 40m qcx, would it be helpful to add on a PA to this kit?  I have an average ant up about 30+- feet in the sky. I receive pretty well in the evenings but I don't seem to be getting any responses back.   I'm thinking I don't have enough powertpower get out?

Darren
KN4WML,


Re: PA for qcx 40m #qcx40

Gary Bernard
 

The antenna should be fine. You don’t perchance have your rig on practice mode?


On Jun 6, 2020, at 8:46 PM, Gary Bernard via groups.io <garybernard2@...> wrote:

What kind of antenna are you using?


On Jun 6, 2020, at 7:28 PM, Darren KN4WML <darrent78@...> wrote:

Question from a newcomer.   With the 40m qcx, would it be helpful to add on a PA to this kit?  I have an average ant up about 30+- feet in the sky. I receive pretty well in the evenings but I don't seem to be getting any responses back.   I'm thinking I don't have enough powertpower get out?

Darren
KN4WML,


Re: PA for qcx 40m #qcx40

Gregg Myers
 

Hi Darren,

I looked on the Reverse Beacon Network for your callsign and don’t see anyone spotting you. So with the beacon stations at least, I see no indication you are getting out. If you are not familiar with the Reverse Beacon Network,  all you have to do is call CQ in the normal way (also de your callsign, of course) and you can look online and see if any of the ‘skimmers’ picked up your signal. As long as you are sending reasonably good CW, there are some very good systems around the country that are quite sensitive and will pick up your signal and report the signal strength. The link is here: 

If you don’t have another radio, you could also pull up a close by webSDR radio online and see if you can hear yourself sending.

Good Luck & 73,
Gregg

On Sat, Jun 6, 2020 at 8:46 PM Gary Bernard via groups.io <garybernard2=aol.com@groups.io> wrote:
What kind of antenna are you using?


On Jun 6, 2020, at 7:28 PM, Darren KN4WML <darrent78@...> wrote:

Question from a newcomer.   With the 40m qcx, would it be helpful to add on a PA to this kit?  I have an average ant up about 30+- feet in the sky. I receive pretty well in the evenings but I don't seem to be getting any responses back.   I'm thinking I don't have enough powertpower get out?

Darren
KN4WML,


Re: PA for qcx 40m #qcx40

Darren KN4WML
 

40m horizontal dipole.    It's up to specs, I'd imagine.    It's about 25 or 30 ft in the air, do I need to be higher? 


Re: PA for qcx 40m #qcx40

Gary Bernard
 

What kind of antenna are you using?


On Jun 6, 2020, at 7:28 PM, Darren KN4WML <darrent78@...> wrote:

Question from a newcomer.   With the 40m qcx, would it be helpful to add on a PA to this kit?  I have an average ant up about 30+- feet in the sky. I receive pretty well in the evenings but I don't seem to be getting any responses back.   I'm thinking I don't have enough powertpower get out?

Darren
KN4WML,


Re: PA for qcx 40m #qcx40

Darren KN4WML
 

How much power? That I don't even know yet, I haven't purchased a meter to test yet. I'm looking to get one by the end of the week.   As far as I know I might not even been transmitting at all.   


On Sat, Jun 6, 2020, 9:34 PM Mike Besemer - WM4B <mwbesemer@...> wrote:

Darren,

 

Just for grins, set up for WSPR and see what you get for spots at http://wspr.aprsinfo.com/.

 

How much power are you using now?

 

Mike

WM4B

 

From: QRPLabs@groups.io [mailto:QRPLabs@groups.io] On Behalf Of Darren KN4WML
Sent: Saturday, June 6, 2020 9:29 PM
To: QRPLabs@groups.io
Subject: [QRPLabs] PA for qcx 40m #qcx40

 

Question from a newcomer.   With the 40m qcx, would it be helpful to add on a PA to this kit?  I have an average ant up about 30+- feet in the sky. I receive pretty well in the evenings but I don't seem to be getting any responses back.   I'm thinking I don't have enough powertpower get out?

Darren

KN4WML,


Re: PA for qcx 40m #qcx40

Mike Besemer - WM4B <mwbesemer@...>
 

Darren,

 

Just for grins, set up for WSPR and see what you get for spots at http://wspr.aprsinfo.com/.

 

How much power are you using now?

 

Mike

WM4B

 

From: QRPLabs@groups.io [mailto:QRPLabs@groups.io] On Behalf Of Darren KN4WML
Sent: Saturday, June 6, 2020 9:29 PM
To: QRPLabs@groups.io
Subject: [QRPLabs] PA for qcx 40m #qcx40

 

Question from a newcomer.   With the 40m qcx, would it be helpful to add on a PA to this kit?  I have an average ant up about 30+- feet in the sky. I receive pretty well in the evenings but I don't seem to be getting any responses back.   I'm thinking I don't have enough powertpower get out?

Darren

KN4WML,


PA for qcx 40m #qcx40

Darren KN4WML
 

Question from a newcomer.   With the 40m qcx, would it be helpful to add on a PA to this kit?  I have an average ant up about 30+- feet in the sky. I receive pretty well in the evenings but I don't seem to be getting any responses back.   I'm thinking I don't have enough powertpower get out?

Darren
KN4WML,


Re: Shipping FAQ

Gwen Patton
 

That's why they're called the US Snail.



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


On Sat, Jun 6, 2020 at 8:28 PM Ham Radio <bernard.murphy@...> wrote:

If a Post Office is involved in a delivery,  the time multiplies.  I have had orders from Tayda (in Thailand) via DHL take 3 calendar days.

For your new QRPLabs toys, use FedEx and spend the extra dollar — well worth it.   
--
73, Bernie, VE3FWF


Re: Shipping FAQ

 

If a Post Office is involved in a delivery,  the time multiplies.  I have had orders from Tayda (in Thailand) via DHL take 3 calendar days.

For your new QRPLabs toys, use FedEx and spend the extra dollar — well worth it.   
--
73, Bernie, VE3FWF


Re: Clock Alarm with Speaker within Case #clock #case #mods

Newman
 

Happy Saturday.  Our clock, audio amo, and speaker are now operating great.   We can play the chimes based on an alarm setting.

However,  we are experiencing a steady humming in the speaker when power is enabled and the backlight is on.  I read about a "mute circuit" that may block the humming, when the alarm is not playing. Is there a simplified way to implement a muting circuit?  We would welcome any suggestions.

Also,  we are exploring components or other options (I.e. additional resistors) to dampen or decrease the loudness of the Westminster chimes.  Any suggestions for a low-cost way to do this?

Much thanks for the knowledge in this message board.

Chip Collins,
N4CHP


Re: #qcx serial number #qcx

 

Ah, well now, you may have mistaken me for someone with some authority or control...
Far from it ;-)
Sorry, that would be now be a question for Hans :-)
--
Julian, N4JO.