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Re: Lost power
On Wed, Jul 17, 2024 at 06:47 AM, Howard Lamhut wrote:
and had almost no power on all bands. Howard,
some question:
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These are some steps.
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73, Ludwig
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Re: Lost power
Have you been using the same power source for the last year?
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What is/was the voltage supplied on last use?
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I ask this as the BS-170. tend to be 'sensitive' to high input voltages.? ?This is common min many rigs that use this device for a PA section....? A web search will show this as a common topic on many boards. |
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Re: Greetings
开云体育Jim N7RCS wrote… I get a "404 Page Not Found" on the link you posted for crystals. Has something changed? The “retired” version of it is at… -- 73 Keith VE7GDH |
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Successful QMX Low Band Build
After an unsuccessful first try on building a QMX low-band rig, I reordered the kit and built it again. This time: 100% success.
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I must say that building these kits is sometimes like constructing a Swiss watch. Everything must fit just so. But, more importantly, solder technique is critical. This time I strictly followed Hans' advice about 10 seconds on solder joints (including 5 seconds to heat the joint before applying solder). In addition I made it a practice to confirm continuity at key points and elsewhere. Finally, I was delighted with the power out results I achieved with this build as measured via built in QMX diagnostics via PuTTy.
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80m: 4.8w
60m: 4.1w
40m: 3.8w
30m: 3.2w
20m: 2.7w
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See attached image of the completed main board and note how tightly packed the turns are on 80-60-40. I believe this made a difference in power out. I did not wind 30-20 as tightly and power out is a bit lower. Not 100% sure this winding strategy made that difference but, either way, I'm very pleased with my completed QMX low-band rig, especially after having two issues with the initial build I attempted. I believe my issues on that initial build were most likely self-inflicted. But, I learn each time I build another kit, which is very rewarding.
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Of course, it goes without saying that Hans' meticulous design and all the work he puts into documenting each build, including the extensive QMX video tutorial, all make building his kits a challenging pleasure.
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Thank you Hans, and thanks to everyone who so generously provides tech support for these kits. What a fabulous resource you are.
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————————- Jim? N7RCS Palm Bay, FL |
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Re: 2024 Flight of the Bumblebees
Based on some questions that ?I have received, I have added the following to the FOBB Rules on
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POTA/SOTA OPERATIONS AND HIGHER POWERED HUNTERS/CHASERS:
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Many of the Bumblebees have indicated that they will be operating from POTA or SOTA locations. ?
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Many Bumblebees have said that they will also be responding to POTA Hunters and/or SOTA Chasers.
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As long as a Bumblebee Number is sent in the Outgoing Exchange, that will be a Bumblebee FOBB Contact.?
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FOBB Home Stations are expected to be running 5W QRP.
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However most POTA Hunters and SOTA Chasers will be running more than 5W QRP.
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A Bumblebee should strive to obtain and log the Power of the POTA Hunter or SOTA Chaser.
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?However, that is not always going to be possible - do not dwell on it - move on.
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?(POTA Hunters and SOTA Chasers running more than 5W QRP cannot Submit FOBB Results)
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72,
Jody - K3JZD ?
On Sun, Jul 14, 2024 at 08:50 PM, Jody - K3JZD wrote:
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Re: Progrock2 for Atlas210x
I have an Atlas 350XL I'm going to try these in, but first I plan to use them in a repeater project. They should work for either, and the prospect of having programmable band segments on the Atlas is intriguing to me.
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Bomar is the only US crystal company left that I know of. Try them if you don't choose a Progrock2.
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73 Chuck AI7SY |
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Re: QMX 80-20M - High SWR on Dummy Load?
#qmx
#swr-sweep
A had an SWR issue with my freshly built QMX+ which uses the exact same T507 as the QMX. I had wound both binocular windings in the same sense, i.e. both counter clockwise. When I noticed the SWR problem, I realised this and considering the SWR measurement to be a 'bridge type' I'd figured out, that both windings had to be each other's mirror image. In other words: one winding counter clockwise and the other clockwise, as described in the document quoted by Robert KD9YUY.
I unmounted T507 and rewound it the 'proper way'. Result: no difference whatsoever! So apparently, the winding sense does not matter. At the end, the problem was a poor solder connection of the 0.60 mm (AWG #22) wire...
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Michigan QRP Club Weekly QRP Chat - Zoom Teleconference - July 18
开云体育Please join us Thursday (and every Thursday) at 4PM Eastern for the Michigan QRP Club weekly QRP Chat where the main topics will be QRP and other ham interests. It's fun, it's easy, and it's free. You only need a computer, a smart phone, or a tablet that can connect to the Internet. OR if you can't be close to any of those you can join by audio with any standard phone. Just follow the directions below. No software needs be loaded or installed. Anyone can join and non members are welcome. Details are here: This weeks topic will be: Keys Anyone can take the floor and tell us about keys . We will go one by one until all have had a chance to have the floor. Files, pictures and presentations can be shared if you have any. There will be time for comments and questions. Please try to stay muted when someone has the floor. We have a list of future topics: QRP Skills and Tools Shack logging Field logging QRP Contesting CW practice If you suggestions for topics, please send them to: Ed AB8DF ekwik at |
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Re: QMX rev4 60m-15m build TX problem
#qmx
Dear Ludwig
Thank you, I believe there is no problem with the T507.
It now works normally after removing the Japan limit. Thank you very much. --
JI3VOV_toru |
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Re: QMX rev4 60m-15m build TX problem
#qmx
To Shuji
I had the Japanese limits set.
When I removed them it worked fine. Thank you for your advice, is this limit only useful for the low band version? I'm relieved to hear that it was built properly. --
JI3VOV_toru |
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Re: Issues with QCX+ kit
Rather than using a damp sponge as suggested in the graphic I use one of those brass wool tip cleaners. ?https://www.amazon.com/Soldering-Cleaner-599B-Water-free-Hakko/dp/B000AQQFMG
It does not cool the tip as much and avoids the thermal shock which can crack the plating on the tip.
73, Don N2VGU |
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Re: QMX Time Synchronisation Bug
Hi all,
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my initial concerns where about the Beacon mode where the QMX will operate standalone.
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I would also suggest here that the internal clock of the QMX gets a dirty flag which is set to true until the clock was either synchronized via GPS or set manually.
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And while the clock is "dirty" the Beacon mode should not transmit at all, displaying a "clock not synchronized" indicator.
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This will especially prevent the QMX from transmitting right on poweron, when the time starts at 0:00 and the start frame is 0 as well.
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But sure - when a computer comes into play, it's already possible to synchronize the computer clock via GPS - just plug the QLG2 to the computer via it's USB interface and use a tool like or ?or the one mentioned by TA1MHS
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No need to connect the QLG2 to the QMX in this case. (But it's still possible of course...)
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73, Andreas |
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Re: QMX shows 3v3 SMPs board stuck in linear
Hi Gunnar, initially I was trying to make sure there was no shirt on the middle pin but then I opened a ticket to check and Hans confirmed that there should be continuity between these two points so I left it. I did verify each connection as I made it but there is obviously something wrong so I’ll recheck them.?
I appreciate you taking the time to respond and I’ll post updates at the end of the week when I get a chance to continue working on my little radio.?
73 de gi7fdz |
Howard Lamhut
Chuck AI7SY
Donald S Brant Jr