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Instead of all the hoohah about QCX mini overheating of BS170’s, if you are going to use modes that have 100% duty cycle, why not run the mini on 9v, the power drop at the finals will not be noticed

----- In a broader context, there are serious reasons to fret about this heavy dependence on China. Do an Internet search for “China bubble.” You’ll find numerous articles from a wide variety of

Hi measured spurious on 80M with leaded inductors: Used a 40dB power attenuator so -3dBm straight into to the analyser, fairly good results 73 Andrew

Well I've managed to get 20 & 40 working well but 30 and 80 remain virtually inoperative. I'll leave it as is for now because I use 20/40 mainly anyway. Over Xmas Break I will probably remove L12 an

Hi Hans, I realize all of this and know it’s unavoidable. Nonetheless, I still try to avoid buying from China whenever possible. Still hoping we can turn the train around before our kids are forced

for LPF: It will be much more cheaper using https://qrp-labs.com/lpfkit.html (these are for QRP, pls use bigger toroids, higher voltage capacitors) http://shop.qrp-labs.com/kits/ULPF Aliexpress (much

Hi. Thanks guys for all Your useful input about IF, WHY and WHY NOT using an ATU. I'll have to see what I can make of it. The little piece from QRPGuys looks interesting enough. Perhaps a good place

Hello My tests with 50 Watt Amp concluded: It is not a good idea... No to: Multi band, external filters You can use it? with QDX On 12 Volts on a single band When you align bias on one frequency, it

Hans, So sorry, I thought I had found the reference I was looking for. Mr Godfrey has done an incredible amount of work I am unable to understand, let alone confirm his conclusions. I agree, much of

Photos George? 73 Hans G0UPL http://qrp-labs.com

Hi Mike The reality for a long time now is that 95% of electronic parts made in China. I think that train already left the station quietly, decades ago. EVERYONE's stuff is sourced from China. China

Tom, You have proved that coincidences do happen - sometimes:-) Signs of panic again! Certainly under present propagation conditions at the time of your post 30/20 are likely to be dead. 80m may not

Mike, You’ve articulated a sentiment that is shared by many. I build quite a bit. But I don’t have the time to build “everything.” Nor should I. Or anyone else. Whatever mixture of building

Thank you all. i have now placed ventilation holes in the back of the case. Unlike the the 50 watt amp in which Hans has wisely place the heat sink outside the case. The Mini has the heat sink inside

This is not new. The story ran here in Australia back in May this year. See https://www.abc.net.au/news/2021-05-05/malaysia-airlines-mh370-series-of-turns-before-disappearing/100116446 I've seen

Hi, Tom M7MCQ wrote: 73 SM6LKM

I'm looking forward to the QDX-mini.....the size of a domino. -- John AE5X https://ae5x.blogspot.com

And whilst I'm thinking, the case would have to get bigger for the 2200\630m version to accommodate larger toroids no?..

With the most recent firmware, now a must own shack item! Any reason why a four band limit? Not enough io lines, memory ect. Bi or rgb led for error codes or band selection? Never got to build the v1

Update!!!! Listening to what Alan had said about L12, I just heated up the solder joints and tried it again. 40M is now GREAT! 80 is working too (but the receive level seems a bit low. 30 and 20