Re: sBitx antenna-first warning
Tom wb6b is correct.
run voltmeter along the line to measure the peaks and minimums .
Also, just because you get 1:1 doesnt mean your antenna is efficient. proving this, take a field strength meter and go plot your minimal and maximum readings from it out in the field with various settings.You can have a 1:1 and have a signal that cant make it out of the county if your feed system and antenna is crappy.Or poorly set up or calculated wrong Also you can prove this by received reports on air , , Also the lower the noise level on receive when adjusting a match, means usually you are closer to a match for the radio.Meaning the received signal will be coming in louder and clearer. Just my own experience with my own equipment.
This is my experience with my own homebrewed equipment,.
73
David
ac9xh
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Re: sBitx antenna-first warning
I also remember, that noobies like myself back in the day,ran both tube and solid state equipment. If i remember, 50 ohms was predominantly a VHF issue. Might be wrong.Even on a solid state transceiver, i never had a commercial transmatch or "tuner".?? we all used the simple swr meter,volt meters and ammeters ,light bulbs and neon bulbs,or homebrewd match or used other tricks? like a homebrewed field strength meter to prove our antennas were up to snuff., . I remember climbing? the ladder to the pulley where my inverted vee was mounted,lowing it,cutting off about a 1/4" to 1/2" at a time on each side.,. one ham i knew used flurecent light bulbs also. kind of a field strength meter.And this was with solid state rigs .Most of his station was homebrewed.
Long way away from instant gratification on a meter that might not be telling you the whole story. old technology it might be but its still applicable today.Dont trust your meter. double verify.With the money we spend on our equipment these days we have to.Use what was taught in the license classes and from your elmers.
73
David
ac9xh
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Re: Does anyone have the KD8CEC 5 inch nextion files?
I have it at home and will retrieve it shortly. Works nicely in the InKits enclosure. Make sure you have a separate power supply. The regulator on the Raduino will get to hot with a 5 inch Nextion. (The big Nextion also produces a little bit of its own noise, a whine, in the audio noticeable when the RF gain is turned down. Buffer capacitors on the power line don¡¯t help. Does anyone have a fix?)
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Re: Farhan's Analog Again The Daylight Radio
No, The power transformers are not. I am working at it though. I will probably update this design in a few weeks. I also need to add CW to the rig. - f
On Sat, Aug 6, 2022, 7:40 AM Bob Benedict, KD8CGH < rkayakr@...> wrote: Thanks - so not all toroids are 3D printed.
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? 73
??? Bob? KD8CGH
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Re: Farhan's Analog Again The Daylight Radio
Thanks - so not all toroids are 3D printed.
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? 73
??? Bob? KD8CGH
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I agree.
We need a separate group for the sbitx since it encompasses more than just basic qrp operation. raspberry pi programming,,development,etc. Needs a separate forum so the ubitxers can still press forward with their rigs.
73
David
ac9xh
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The only issue with editing the topic by adding the #hashtag is that it does start a new thread.? The path to all of the history is lost in the thread.
73
Evan
AC9TU
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Re: Ubitx ver 3 ssb transmit question
Here is the original tune-up page.? You would follow the same method as the v4 that this was written for.
73
Evan
AC9TU
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Ken,
Thanks for the tip! I'll let this be my test.
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Stephen, KO4CVU
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Re: Farhan's Analog Again The Daylight Radio
Bob, The tranformers can be bifilar, with 10 turns of a twisted pair of 28 swg over an FT37-43 toroid.? The transformer is marked as trifilar in the circuit because I have a box full of them from HF Signals. I just leave one winding unused. - f
On Fri, Aug 5, 2022, 11:34 PM Bob Benedict, KD8CGH < rkayakr@...> wrote: The plans are clear to me except for T1 and T2. How are the trifiliar transformers wound? How many turns on what size toroid? Are 2 and 6 really unconnected?
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? 73
??? Bob? KD8CGH
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You can edit your response and include the #hashtag in the subject line of your response when you reply to an individual email.
I wonder what the 'subgroup' function offers - I haven't had a chance to investigate it yet
Ken, N2VIP
toggle quoted message
Show quoted text
On Aug 5, 2022, at 14:17, Stephen KO4CVU <goinfishin1952@...> wrote:
Unfortunately, I haven't figured out how to put a #HASHTAG on a reply to an exisitng post yet ... but when I do, I will.
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Just got a 256 GB uSD for my Pi.? Still waiting for the sBit itself to ship - ordered it a week ago,
Gerry Sherman
Sent by the Thunderbird
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Re: Does anyone have the KD8CEC 5 inch nextion files?
Check the file section under AJ6CU. The only problem might depend on how new your screen is. Those files were good with the Nextions with the firmware of several years ago. If you get an error when you try to upload it let me know and I will create a new set for the most recent firmware.?
73
Mark
AJ6CU
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Re: sBitx antenna-first warning
I forgot to say, the only antenna using rg6u quad shield is my vertical. the rest is using ladderline. I have a simple balun to help match impedances and my simple match unit i built.
73 David ac9xh
On Friday, August 5, 2022 at 05:57:31 PM EDT, david todd via groups.io <ac9xh@...> wrote:
I used to use an ammeter and a neon bulb. tune to max on both. Also,It helps to cut the antenna to band resonance. I have several antennas ,one for each band i run, also i use a homebrew vertical 3 ft above ground with no radials and this one is the one i use? from 80 to 6 meters. i actually have to use my homebrew match for it.
All my antennas have been cut for band resonance, i dont use a commercial match except for my ubitx v6 which i installed inside of it.. For my other ubitxs and bitxsi use a homebrew match using 15 turns of #22 gauge wire with a 100 pf variable? to help match to the antenna and a $5 dollar swr meter inline. Ive used this setup for all my radios, and including ubitx v3,v6,bitx40, patcomm pc 500, argonaut 509,.
Sometimes, if your antenna is crappy or not designed properly, or have feedline problems etc ,you can"tune" the "antenna tuner and receive almost a 1:1 and never get out very well because of the false sense of security with an antenna tuner. I dont like the term tuner We all use, because you are not tuning the antenna,but just creating a compatible match from radio to cable.
You might check your coax,fittings and antenna connections. With an open circuit(break in the coax at the fitting or antenna)you will take awhile to get any match impedance wise. If you have an auto antenna match, and it starts clicking for over 6 to 14 seconds, more than likely an open somewhere or a really big problem with your antenna, .I personally experienced this with the ldg z100. had a cable break right at the fitting.
Just my personal take of it all. And i have never popped a final on any of my ubitxs or bitxs.
73 David ac9xh
On Wednesday, August 3, 2022 at 03:09:45 PM EDT, Jerry Gaffke via groups.io <jgaffke@...> wrote:
Here is one of many posts from Allison that are worth reviewing, mentions the 6m 225W power amp she built using 4+4 IRF510's in push-pull. The whole thread is worth a read. ?? /g/BITX20/message/22597She has been contributing to the forum for some time now: ?? /g/BITX20/message/14514?? /g/BITX20/message/869Just plugging a new fet into the sBitx likely won't solve anything. The circuit around it should be designed specifically for that part for good performance. Jerry, KE7ER
On Wed, Aug 3, 2022 at 10:14 AM, Jerry Gaffke wrote:
The IRF510 can work dependably, Allison reports years of success with HF amps at 40W push-pull,
surviving everything from accidental open antenna connections to dead shorts.
In posts to this forum from several years ago, Allison went into plenty of detail.
She even used them on 6m at several hundred watts (with bunches of them in parallel).
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Re: sBitx antenna-first warning
I used to use an ammeter and a neon bulb. tune to max on both. Also,It helps to cut the antenna to band resonance. I have several antennas ,one for each band i run, also i use a homebrew vertical 3 ft above ground with no radials and this one is the one i use? from 80 to 6 meters. i actually have to use my homebrew match for it.
All my antennas have been cut for band resonance, i dont use a commercial match except for my ubitx v6 which i installed inside of it.. For my other ubitxs and bitxsi use a homebrew match using 15 turns of #22 gauge wire with a 100 pf variable? to help match to the antenna and a $5 dollar swr meter inline. Ive used this setup for all my radios, and including ubitx v3,v6,bitx40, patcomm pc 500, argonaut 509,.
Sometimes, if your antenna is crappy or not designed properly, or have feedline problems etc ,you can"tune" the "antenna tuner and receive almost a 1:1 and never get out very well because of the false sense of security with an antenna tuner. I dont like the term tuner We all use, because you are not tuning the antenna,but just creating a compatible match from radio to cable.
You might check your coax,fittings and antenna connections. With an open circuit(break in the coax at the fitting or antenna)you will take awhile to get any match impedance wise. If you have an auto antenna match, and it starts clicking for over 6 to 14 seconds, more than likely an open somewhere or a really big problem with your antenna, .I personally experienced this with the ldg z100. had a cable break right at the fitting.
Just my personal take of it all. And i have never popped a final on any of my ubitxs or bitxs.
73 David ac9xh
On Wednesday, August 3, 2022 at 03:09:45 PM EDT, Jerry Gaffke via groups.io <jgaffke@...> wrote:
Here is one of many posts from Allison that are worth reviewing, mentions the 6m 225W power amp she built using 4+4 IRF510's in push-pull. The whole thread is worth a read. ?? /g/BITX20/message/22597She has been contributing to the forum for some time now: ?? /g/BITX20/message/14514?? /g/BITX20/message/869Just plugging a new fet into the sBitx likely won't solve anything. The circuit around it should be designed specifically for that part for good performance. Jerry, KE7ER
On Wed, Aug 3, 2022 at 10:14 AM, Jerry Gaffke wrote:
The IRF510 can work dependably, Allison reports years of success with HF amps at 40W push-pull,
surviving everything from accidental open antenna connections to dead shorts.
In posts to this forum from several years ago, Allison went into plenty of detail.
She even used them on 6m at several hundred watts (with bunches of them in parallel).
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Re: Ubitx ver 3 ssb transmit question
There was a setup doc that said initial current should be between 470-500mA. Adjust one pot for 100mA more. Stop. Do the other one for a total of 200 mA more than initial current. That makes more sense now.
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Re: Jacks T41 Board Sets Available
I¡¯ve been following Jack Purdum¡¯s T41 SDR project on his group. Looks like they have a few board sets left for sale from their group buy activities. You can get them from K9HZ. Eight boards for $6.15 plus shipping.
MRM
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¡_. _._
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Does anyone have the KD8CEC 5 inch nextion files?
looking to upgrade my uBITX with the KD8CEC software, and all works well on the smaller Nextion, but want to upgrade it to the 5 inch display,
and I need the file.
thanks
N2AIE
Vince
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I totally agree with Stephen and like the #HASHTAG idea.? I own 6 uBitx (2 v4, 1 v5, and 3 v6) and have an sBitx.
73
Evan
AC9TU
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Owning three uBITX's (two v6's and one v5) with a sBITX kit due next week, I would prefer that there be just one group, the BITX20, for all of them.
BUT?if we could all religiously apply appropriate #HASHTAGS to our original posts, we would make the group much more useful.
Looking at the #HASHTAG option, I just learned that I can choose to filter out or be alerted for a post with a certain #HASHTAG! That way, I can filter out posts that don't interest me and focus on those pertinent to my units.
Unfortunately, I haven't figured out how to put a #HASHTAG on a reply to an exisitng post yet ... but when I do, I will.
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Stephen, KO4CVU
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John Terrell, N6LN
Bob Benedict, KD8CGH
MadRadioModder
Vince N2AIE