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Re: Power out on 60 mtr QCX+
Keith, you should be able to get a good 4 or 5 watts out on that band. Have you tried adjusting the lowpass filter toroid windings yet? I would suggest that you start with L3 and spread the turns as much as possible. If the power increases as you spread them and is still increasing when you get them spread as far as they will go, then remove one turn from L3 and check again. The best way to remove a turn is to heat the outer wire connection and lift it out of the hole. Then unwind a turn. Don't cut the wire and don't try to clean out the hole. Just tack solder the wire to the top of the board. If you have to remove another turn, do it the same way. When and only when you get them where you want them to be, trim the wires and reinstall. I usually just solder them to the top of the board instead of risking board damage trying to clean out the holes. Next, squeeze the turns on L2 a bit. If that increases power, squeeze them further until the power peaks and finally spread the turns on L1. In all cases, if the opposite happens when adjusting turns spacing just go the other way. You will need to play with all of them probably. Stop when you get to 4 or 5 watts. There is no advantage in going beyond 5 watts and it will only serve to shorten the life of the finals. It should?not be necessary to remove more than one or two turns maximum from L3.? Good luck .. .73 .. Ron On Sun, Apr 20, 2025 at 8:03?AM Keith via <keithlewis25=[email protected]> wrote:
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Re: I think I broke my QMX...
Mike, I can see several cold solders and tiny bridges in your photos. I suggest you clear those first. 73! de Bekir TA2RX 21 Nis 2025 Pzt 19:49 tarihinde Mike, KL7MJ via <alaskamike=[email protected]> ?unu yazd?:
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Re: I think I broke my QMX...
I replaced L503 with a through hole 330uH inductor (I don't have any smd parts available).? It looks ugly, but I think there are solid connections to the PCB.? Unfortunately, the RF still isn't getting through. I didn't try to resolder to many joints - they were before I started messing with the diode.
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BS170 FET
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My QMX Plus is approximately 25% down on the Test Certificate power, so I am looking to replace one of the BS170 FETs. The Farnell catalogue has many different suffixes to their BS170 devices. Should I select a particular device?
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CW Practice / Rag Chew
¿ªÔÆÌåÓýOn 4/21/25 I had a CW practice / rag chew session
on 20 meters. I worked no stations:
Conditions were OK. SSN = 108, SFI = 156, A = 14, K
= 5.
I heard several very weak stations calling but they were too weak to work. My next CW practice session will be?April 23 at 16:00 EDT / 20:00 UTC on 20 meters.?Anyone and everyone is welcome. This practice is intended for operators who are new to CW or they need some practice. IT DOES NOT MATTER HOW POOR YOUR CW IS. Mistakes are OK. Poor fists are OK. Slow speed is OK. Really slow speed is OK. This practice is meant for you to improve your CW. I will do my best to adjust to your skill level. Operate at any power level. If several stations show up, I will operate as a round-table control station. I will do it as a round-table so everyone gets a chance to transmit. Please listen to my directions. Details: Date - April 23 2025
Time - 16:00 EDT? 20:00 UTC Band - 20 Meters How to find me - I will find a clear frequency and call CQ. Go to the Reverse Beacon Network and search for my call sign AB8DF. That will tell you what frequency I am on. Tune
your station to that frequency and if you hear me give
me a call. If there is a QSO in progress, please wait
for a break in the action. Then send your callsign. If I
hear you, I will invite you to join the QSO and start a
round-table QSO.
Reply to this email if you have questions. IT DOES NOT MATTER HOW POOR CW IS Ed AB8DF |
Ronald Taylor
Keith G3WGE