I continue to be amazed at how hot the receiver is. I heard a very strong OK7 near the end of the contest on 40 and thought conditions might allow a QRP contact, but no go. Turned on the IC-7300, hear

#antenna #qcx

Great that you solved it. And yes, it’s always good to learn how something works in the process. 73... Ron

#antenna #qcx

Thanks Ron but I think I might have resolved it with a dry joint. I will however get my cheap Chinese scope out and work though Hans's guide as he says, it's great for familiarising oneself with the w

#antenna #qcx

Hi Keith. The best way to troubleshoot the receiver section of a QCX is to follow Hans’ very good troubleshooting guide located here: https://qrp-labs.com/qcx/qcxtrouble.html If you don’t have an osci

#antenna #qcx

Hi I had very welcome help in sorting out a lack of any RF output from the group on my QCX and self test now shows a good 4.5 watts measured. However I have no signal on receive. using my long wire an

#antenna #qcx

Hi, i am using so called CCTV jacks with 6 pins, they fit exact in the cutting of the Bama case. The jack is a clip on type, the screws are not needed. I mouned them only to cover the holes. Ralf

#case #gps #antenna

JohnL. Buying Chinese toroidal is fraught with risk. If your QTH is North America, buy from Diz at Kits and Parts. Or buy from any of the big part suppliers like Mouser or Arrow. Buy more than you nee

#40m #antenna

Difficult to ascertain whose make they are as I have never seen any manufactures details on any cores. make sure you are looking at the type mentioned, a FT prefix is a ferrite material and a T prefix

#40m #antenna

I see a big price difference on T140-43 toroids. Is there a certain recommended brand to get or are generic (I am assuming they are Chinese) ones okay ?

#40m #antenna

KC3KZ de VA3RR Kevin, the box is advertised on Ebay as measuring 2.56"L x 2.28"W x1.38"H. These are the outside dimensions. There seems to be a few boxes that would accommodate an FT140-43, plus conne

#40m #antenna

Thanks for the responses so far. I am using my newly built 40m QCX. Here is the link to what I purchased. Usmile LW1650 Portable Long Line... https://www.amazon.com/dp/B0141X3B5W?ref=ppx_pop_mob_ap_sh

#40m #antenna

Using an even number of 1/4W elements is a mistake. That raises the feedpoint impedance. An odd number of 1/4W elements is a better solution. That way you feed the antenna with current. For receiving

#40m #antenna

Can you tell me what the name of those boxes is? What can I search for? What are the approximate dimensions? Thanks so much. -Kevin KC3KZ

#40m #antenna

JohnL, Short answer is no. Longer answer is see AA5TB site http://www.aa5tb.com/index.html look at anything EFHWin the index. For a monoband radio a simple tuned coupler with a ~1:9 turns ratio should

#40m #antenna

But it was posted to the QRP-labs group, not the QRO-Labs group ;-) Joking aside, those little ferrite rings will do 5w with ease, and I've run them for hours in beacon mode with 15-20w and no warming

#40m #antenna

A 140 toroid fits nicely in those inexpensive boxes commonly found on auction sites,,,

#40m #antenna

A 140 would certainly be an overkill for QRP, but John did not mention the power of his rig. He did not mention QRP. A 140 would make a 100 Watts possible, I use that myself. Cor – PA4Q

#40m #antenna

Cor, I agree with your detailed analysis. However, isn't a 140 size toroid an overkill for QRP levels?

#40m #antenna

Hello John, Your balun looks exactly like the ones sold on ebay now for listening. These are 1:9 with a core of unknown properties. You have to make a decision, you could make a resonant halfwave endf

#40m #antenna

i have this balun from an old end fed 1/2 wave antenna that I was using for listening. I cut a new 70ft chunk of speaker wire for transmitting on 40m. I don’t have an antenna tuner and I am just getti

#40m #antenna