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Using this would be my approach, rather than attenuating the signal by 26dB and re-amplifying it by 29dB. 73, Don N2VGU

COR can be problematic with any modulation, as it will by nature always "hot switch" when drive is sensed, open-circuiting the output of the driving amplifier/radio as the amplifier switches from RX

Hi Joshua When the HL2 onboard PA is not enabled, there is NO RF output on the ANT output connector, the ANT connector becomes a RX input connector, and the RF1 connector is the only RF output,

Can anyone recommend one in the U.S.? -- Wayne S. KF7RCM

What is the drive from the HL2 without the onboard PA activated? I know it is a very low level output but I don't remember if it is adjustable. You may not need a t attenuator if the output is

Thanks Ludwig, I actually found my dummy load. I believe it is the coax or possibly even the antenna that is causing my a problem. What was confusing was that the SWR and the Return Loss on the VNA

Thanks Steve, I think you may be right. I found my dummy load (hooray). ?I measured it with my VNA and got 1.07. ?I then put that into my QMX and at first got a set reading if 10 but disconnected

Dan, so it looks like a problem related to this SMPS board. Maybe the short comes from something burnt? Her is a document ( /g/QRPLabs/wiki/37128 ) from the QRP Labs Wiki how to

On Fri, Jul 12, 2024 at 02:13 PM, Bruce Akhurst wrote: On Fri, Jul 12, 2024 at 02:13 PM, Bruce Akhurst wrote: > > > > First: I thought it was called 350 and output 300W peak on a very good day >

It is a great pity you have misplaced your dummy load, because your antenna appears faultless, and my next step would be to put a decent 50 Ohm load on the QMX and see what it thinks of it. Perhaps

You're thinking about the right things. I would recommend a bit of testing before building a pyramid First: I thought it was called 350 and output 300W peak on a very good day but I may be wrong You

* On my very first startup trying to power on, I got nothing at all. I did the logical thing and reheated a bunch of connections - especially the two push button connection on the encoders. * After

Thank U Allison, that was very quick off the mark, very much appreciated. I have used relays for voltage free keying of the BLA-350 and for keying the QRPLabs 10W Linear as the most flexible and

* VNA comes with SMA and QMX with BNC. So you use at least one additional adapter. Could you tell how the antenna cable is connected in each case? * BNC connectors are reliable. But in rare cases

As outlined that is the way to go. You may consider a low level PTT control for that so the keying voltages for the amp and driver are compatible. also a way to shut down the driver amp for a mid

How does the QMX behave with a 50 ohm dummy load? If the QMX reads a low VSWR with a dummy load, the QMX is working properly. In your previous post showing the Putty screen, VSWR was shown as 1.94 to

Hi I'm reaching out to the experts for advice, guidance & help please. The Hermes Lite 2, "HL2", is a DDC/DUC SDR transceiver - http://www.hermeslite.com/ - which can output upto 5W PEP RF. The RM

Hi Francesco, The green ”COLOUD" speaker that Steve links to is decent and very lightweight. It doesn't have great battery life though, at least my one doesn't. The Anker Souncore mini is also

No problems with a straight key on any of my QCX's. The only time I had a issue was when using a particular amplified Bluetooth speaker. Even though I was plugged into the line input, there was a

I haven't heard of this issue before, but I have experience different audio anomalies with different headphones.? Sometimes it's just the impedance of the headphones, or the connector. I have trouble