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? ? Nick and Ryuji, Here’s my SOTA 30/40 LPF design it measures quite well after building 73 Ross Sent from my iPhone 6

Old fashioned fault finding. ignore the windows detection for now. ?and Look at the circuit. See if a resistance measurement across +to- ?(caution. your meter may not be +ve on the red lead.

By increasing the current to 1 A the Qmx turned on for about 10 seconds, it was connected to the PC with win 8 and it was detected, then I smelled a burning smell and I immediately disconnected the

Hello Roberto Ross EX0AA has had success using QDX-M http://qrp-labs.com/qdxm built directly for 6m. 73 Hans G0UPL http://qrp-labs.com https://www.buymeacoffee.com/g0upl wrote:

Use what you have and filter it with a Drok buck boost device for $16 USD. Boost Buck Converter, DROK DC 5.5-30V to 0.5-30V 5V 12V 24V Output Adjustable Power Supply Regulator Module, 4A 35W High

"On the pcb there is a footprint for an sma connector. Make sure there is not too much solder and making a connection." I think this short to a SMA pad can easily hapen if installing BNC too low on

Hi all QRPers I'm a QDX builder/user and want to try 50MHz activity. Any suggestion about transverter or rtx kit?? Any future project from our Guru? 73 Roberto -- I2RWR Roberto Ranzani - JN45mn

Ryuji, The response and values that I posted to Tony are OK but better filters are possible. For [40m/30m] this is better: 390pF, T30-6 16 turns, 620pF, (T30-6 13 turns//150pF), 330pF. The attached

Interesting! Have you tested it in the high-band QDX? Does it perform without reduction in power even at 30 MHz? -- Sverre LA3ZA http://la3za.blogspot.com

Hello Jon Imbalance in the trifilar due to messy winding is one of the factors that can affect image rejection. But there are also others, component tolerances is an important one. Generally the

Hi Hans...?? haven't been by the site for a while,? just noticed the TX transformer doc the other day.?? Uh, I do fit into that description,? so, debating on making the change on my low band Rev

I have been using the?Korad KD3005D for years now. It has all you need for a nice price (Euro 59) and with a real transformer in it (no switch mode power supply). 0-30V / 0-5A incl curent

I'm a bit of a newb. What bench power supply would you recommend for building kits like the QDX and QMX? I would prefer to buy a new product (vs used) and if possible like to keep the price to

Well Andy, I figured it out. Actually I accidentally stumbled onto a solution that causes the UL3S to do what I want it to do.? I've got 13 WPM CW for 1 minute, 30 seconds, then 20 seconds of

Jim, Jeffrey Moore has offered to help anyone get their qrp-labs kits fixed. He has the equipment to do it. Shoot him an email. jeffreymoore@... 73, Cliff, AE5ZA

Kieth, I am glad that you have the radio working. For the new kits with SMD components, I have bought two tools: 1 - A hot air rework station 2 - A desoldering tool. For the first, there are

Actually BS170 Ciss is 24pf. 24x3 = 72pf comparable to FDT86256’s 54 pf is not too off though QCX class E PA caps still might need some tweaking. 73 Barb WB2CBA

I might be interested if I can be of service to you. Meaning I will give it my best. These are too neat of a little radio to just junk. I can appreciate your frustration! 73KarlKI4ZUQ On Wed, Sep

Oh i see now. That makes sense. The BNC probably was shorted to the sma footprint on the PC board. I only wish I had worked on the BNC connector first. Perhaps T507 was ok after all.

You may have seen a post I did a few weeks ago regarding my QMX kit. After assembling it I discovered the dreaded short between Q103 and Q104. Power has NOT been applied. It is wired for 12 operation.