I built a Z match tuner from a circuit which is almost the same as the Emtech. It was a fun build and the component cost was very low. It also helped me better understand the theory behind it as well.

#qcx #antennatuner

Hi Mike, yes i've seen the qrpguys products as well. However, I didn't know them at the time I ordered the Chinese kit. They're probably a lot better, but this one now works well enough to try out for

#qcx #antennatuner

Nice mods! I've also modded one - yellow core, fewer turns, extra capacitors switched in, and a 3-watt resistor in the tune bridge. Carol Milazzo's blog is also very useful. I use mine with a random w

#qcx #antennatuner

You’re right about the Z match being wide-range. The price is at the high end, but I’m happy with my EMTECH ZM-2. After doing a lot of reading up on portable antennas, I opted for non-random over a ha

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So what ? The rig LPF has already sorted out the harmonics. And beside, ANY tuning network has a Q factor, meaning that anything outside of it's matching frequency is attenuated anyway, usually by at

#qcx #antennatuner

YUCK, a TEE network. Yes they work in that they do transform the antenna impedance to match the transmitter. However the Tee network acts as a high pass filter and provides NO harmonic reduction. It a

#qcx #antennatuner

QRP Guys offers some excellent antenna tuner and tuner/antenna combinations for only slightly more than those from China and the instructions are excellent. I know. I built their Digital Power/SWR Met

#qcx #antennatuner

Hi All, I've added an article to my blog on building a small QRP antenna tuner for the QCX mini. Also works with other QRP transceivers of course. Here's the link: http://blog.aha.nl: building a QRP a

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Reg, I'm still not a fan of AliExpress, but they seem to have noticed the complaints against sellers and have actual people now responding to buyers. The sellers appear to have been warned about compl

#antennatuner #ebay

I'am using ATU-10 from the beginning of QDX Very happy with it, at home and at remote QDX, Hermes lite 2, ICOM 705 Battery lasts forever I also have an ATU-100 (not good for QRP) and a ATU-100 OGS-3D

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I got one of my last three orders from Aliexpress. Now overall, the whole pile was cheap enough that is was okay. I intentionally ordered the parts (a bag 'o 9 MHz crystals) from two different places

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>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.” No need to build "everything", just what you need. Getting components is v

#antennatuner #ebay

Very true Hans. I have bought a lot of stuff made in China, usually there is no other source. I dealt once with Alibaba and had no problem. I would not use Aliexpress ever again and am wary of Alibaba

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Hello Bertel, I have an ATU-10 and other ATU's. The ATU is not a problem, however the output stage of the QDX won't like wild impedance excursions whilst the ATU is searching for the best setting. I t

#antennatuner #ebay

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 to

#antennatuner #ebay

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 t

#antennatuner #ebay

Hi Mike > I know that QPR-Labs stuff is > sourced from China and I honestly > wish it was not. The reality for a long time now is that 95% of electronic parts made in China. I think that train already

#antennatuner #ebay

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 and buying

#antennatuner #ebay

Honestly, I’m sick of China and try to avoid buying from China when I can. Today I received a package containing a SoloStove Smokeless Bonfire Kit. It cost well North of $200 on-sale and is touted to

#antennatuner #ebay

Some of us have too many irons in the fire already. Some of us don’t feel like brewing our own anymore. Some of us have been rolling our own for the past 45 years and now our time is worth more than o

#antennatuner #ebay