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Hello, I have been operating this 40m QCX radio for a week or so now, making some nice contacts (mostly 300 to 500 miles during the daytime) and have a few questions about its operation: 1. Is there a

Beautiful Job!

I like ! 73 de Andy

You don't say which band or board build version this is. a) PA Stability modification (if not already present) b) RF Feedback (proximity, bad match, etc.) evaluate behaviour when TXing into dummy

Ken, I'm not sure this will prove anything. If the Si5351 is not working it is either faulty OR it has not been initialised by the controller. I've not looked but I'd believe the schematic, thousands

About the best I’ve seen so far!! Sent: Friday, July 13, 2018 6:37 PM To: [email protected] Subject: Re: [QRPLabs] QRPLabs QCX Enclosure Dimensions LOL Al. Here's my result using the opposite of

Very nice!

Hi Ken There are two test points just to the left of IC1, I think labelled CLK0 and CLK1. These are used to check that the Si5351 is producing a signal from the two outputs. With an oscilloscope you

We just completed a 40 meter QCX build with my 13 year old grandson.We are stuck on step 1 "LCD contrast adjustment". We are following the current Trouble Shooting page under "Digital Section"and are

LOL Al.? Here's my result using the opposite of laziness, OCD!: /g/QRPLabs/attachment/24853/2

Pretty sure it’s a feature of the GPS module but initiated by the controlling device Clint. M0UAW IO83 *No trees were harmed in the sending of this mail. However, a large number of electrons were

Improving accuracy could be accomplished by establishing your own local DGPS (Differential GPS station) using a second GPS receiver. The DGPS concept involves using a GPS receiver that is located at a

I think this is in PC software, not in a GPS module? 73 Alan G4ZFQ

Jira, ? ? I would be interested in one. This may be the incentive I need to start using the printer :-) -- Bob/NZ2Z

It may be possible to imprvoe the accuracy if the module supports a 'survey' mode but that can take days to run...

To add to the comments from Arv- Any GPS/GNSS receiver will find its position in a series of single fixes, each resulting in Time, Lat, Long, and Height. The position is resolved for Time, Latitude,

My first thought - check your supply. Check for unusual voltage swing when you're keying. The supply usually has to have fairly low internal resistance for finals to work properly.

When I key the QRP X with an external Key (SK) the transmitter will hang? and it seems like the final is oscillating.? any cures?

Hi Wes, The information on historical coast stations Is very interesting. In the mid-1970s, after a break for university studies, I decided my CW ability needed improving. Casting around the HF

Sounds likely, IC4 is a nice large SMD so it’s easy to remove and replace with nothing more than a soldering Iron and care. If you’ve a pin chuck and a sewing needle you can put them to good use