Date   

Re: Unable to receive anything on my 20m #chat

gabri22_@...
 

Thanks for your answer Richard, I'll give that a try. :)


Re: QCX died after one QSO

Ham Radio
 

Review all the solder joints with a magnifier and touch up as required.

If still no joy, I would order another micro-controller.
--
73, Bernie, VE3FWF


Re: Is the 20m band quiet for CW or do I have a receiver problem with the QCX #qcx #rcvr

Tim O'Rourke
 

Over the years several of the QRP groups have offered a simple multiband signal source kit. The one I have covers 80-20 meters and has S1, S3 and S9 selectable output.
Could be a great addition to QRP-Labs offerings! I believe mine was designed by Steve Weber.
Tim W4YN 


Re: Is the 20m band quiet for CW or do I have a receiver problem with the QCX #qcx #rcvr

Gadget Lust <gadgetlust@...>
 

Can you tune your QCX to the FT8 frequency and hear signals?   If so, it’s not your receiver, just FT8 sucking everyone away.

The CWOPS CWT’s are very active, and you should hear a lot of CW on 20M during those.   
--
Harv
K2PI
Warrenton, VA


Re: Is the 20m band quiet for CW or do I have a receiver problem with the QCX #qcx #rcvr

zfreak@...
 

John,
When you connect the antenna does the noise level increase? It should.
If not, check the soldering on the low-pass filter L1, L2 and L3. Also check the soldering on the transformer T1. If you didn't get the wire clean you could have a bad solder joint which could kill the receiver.
Good luck
Mike M.
KU4QO

On Mon, Sep 17, 2018 at 11:14 PM, John KF6QPC <j.capel@...> wrote:
I've been having fun experimenting with the QCX as far as configuration and code practice.  However, after hooking up the QCX to an Elecraft T1 ATU and to a end-fed antenna, I'm not hearing any CW activity.  Is 20 meter CW activity dead at this time or do I have an issue with the receive section of the QCX?

BTW, I'm using the same antenna for FT8 and works well.

I look forward to any helpful suggestions.

73 John KF6QPC



Re: #clock firmware development request #clock

Hans Summers
 

Micha, Brian,

Thanks, it is a good suggestion, I have put it on my list. 

Yes, the list does contain some good suggestions... Hans has been a bit busy, not enough hours in the day. 

73 Hans G0UPL

On Mon, Sep 17, 2018 at 4:25 PM BrianB <brianb@...> wrote:
There have been a number of clock feature requests over the last year. Yours is another good one. So far no word from Han's...


Re: Unable to receive anything on my 20m #chat

Richard G4TGJ
 

If you hear an increase in noise as you tune the loop then the receiver must be working. Listen on 14.074MHz. This should be full of FT8 signals during the day. The band will close in the evening.
--
73
Richard
G4TGJ


Re: Is the 20m band quiet for CW or do I have a receiver problem with the QCX #qcx #rcvr

Richard G4TGJ
 

20m should be active during the day but will close in the evening. Listen on the FT8 frequency - this is usually full of signals. If you already have a receiver for FT8 can you listen to the CW band on this for comparison?
--
73
Richard
G4TGJ


Re: Is the 20m band quiet for CW or do I have a receiver problem with the QCX #qcx #rcvr

Scott McDonald
 

John, 

You might try listening for the three CWOPS 1 hour contests that happen every Wednesday, as the band often appears to magically open during those tests, and there are many loud stateside signals.

The activity is nominally between 028 and 038 from the bottom of the cw band, and you can check the times on the CWOPS website, there’s one early, one midday and one late, I think 0300, which may be too late for 20.

Good luck,

Scott ka9p


On Sep 17, 2018, at 9:14 PM, John KF6QPC <j.capel@...> wrote:

I've been having fun experimenting with the QCX as far as configuration and code practice.  However, after hooking up the QCX to an Elecraft T1 ATU and to a end-fed antenna, I'm not hearing any CW activity.  Is 20 meter CW activity dead at this time or do I have an issue with the receive section of the QCX?

BTW, I'm using the same antenna for FT8 and works well.

I look forward to any helpful suggestions.

73 John KF6QPC


Is the 20m band quiet for CW or do I have a receiver problem with the QCX #qcx #rcvr

John KF6QPC <j.capel@...>
 

I've been having fun experimenting with the QCX as far as configuration and code practice.  However, after hooking up the QCX to an Elecraft T1 ATU and to a end-fed antenna, I'm not hearing any CW activity.  Is 20 meter CW activity dead at this time or do I have an issue with the receive section of the QCX?

BTW, I'm using the same antenna for FT8 and works well.

I look forward to any helpful suggestions.

73 John KF6QPC


Re: Unable to receive anything on my 20m #chat

gabri22_@...
 

Hi again,

I've just checked the resistance between wire ends of L1, L2, L3, L4  and T1 on the soldered pads below the PCB and I get 0 ohm readings :s . 

Thanks for your response Chopper.


Re: Unable to receive anything on my 20m #chat

N3MNT
 

Make sure you are making contact on the solder pads and not the wire ends when checking the connectivity of the T1 windings.  Readings that "jump around" when doing alignment is an symptom of poor solder connections on T1.  Use a ohm meter not audible tone.


Re: Unable to receive anything on my 20m #chat

gabri22_@...
 

Ok, so here you have the video example of the alignment process I performed. (Not too precise for having to hold the camer with the other hand, but you get the idea of the amplitude jump around and the values I get): https://www.youtube.com/watch?v=5lD0yGqcWmw

Thanks for the time you take to help me, I really appreciate it.


Re: Unable to receive anything on my 20m #chat

gabri22_@...
 

And yes, I tune my loop antenna and I am able to hear the increase in the background noise.

Thanks again, I am really lost with this because everything seems to be fine (at least in the receiving part). I will upload the video of the tuning process so that you can see how the amplitude bars jump around (which I assume it can be a problem for the receiving part)


Re: Unable to receive anything on my 20m #chat

gabri22_@...
 

Yes, I get the loud tone in the headphones and I've also checked the continuity across L1, L2, L3. However I did it only with the audible signal of continuity. Should I specifically check the resistance?
Thanks for your response.


Re: Dead on start up

Tim O'Rourke
 

Happy camper! I ordered 2 new inductors should be tomorrow. 
RX seems sensitive enough, can almost hear what the 7610 hears!
I ordered 2 new micros, seemed easier than doing it myself.
The audio does seem a bit on low side OK but could be louder for my 72 yr old ears.
Thanks everyone for suggestions that made this a quick fix.
BTW I was one of the first to sign up for kits at Friedrichstaufen in 2017, it was a treat to talk with chaps there about this great radio.
This will make a great portable rig and be used for demos at JOTA this year.
Tim W4YN


Re: Unable to receive anything on my 20m #chat

Rich
 

Good point - my post was poorly worded - they have a very narrow in-tune range for a given frequency.


Re: Unable to receive anything on my 20m #chat

jjpurdum
 

I think it's misleading to say they have a small tuning range. The range is fairly large, but the bandwidth without retuning is small. Indeed, many mag loops are multiband, but with less performance on some bands than others.

Jack, W8TEE

On Monday, September 17, 2018, 6:26:27 PM EDT, Rich <rich@...> wrote:


And - just in case you aren't aware, loop antennas have an extremely small tuning range.  You need to turn the antenna tuning knob slowly until you hear an increase in background noise.


Re: Unable to receive anything on my 20m #chat

Rich
 

And - just in case you aren't aware, loop antennas have an extremely small tuning range.  You need to turn the antenna tuning knob slowly until you hear an increase in background noise.


Re: Unable to receive anything on my 20m #chat

Rich
 

Did you get the loud tone in the headphones when aligning?  Have you checked that you have continuity (with an ohm meter) across L1, L2, and L3?