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SMD 20M BITX20
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Michael Luft
Hello :) Few qustions. This groups started as BITX20 but actualy ?became BITX40. what is wrong with the BITX20? why I cant see any posts concerning the BITX20 hardware? Personaly, 20 Meter band is my favorite, but I cant find enough info about a real SMD BITX20. Any Info will be very apriciated!! :) 73 Mike 4X1LM |
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Mike? 4X1LM The original BITX20 is getting rather old.? After several thousand posts there may not be much more to be said about that design.? There are still kits available for BITX-xx transceivers, but many who built it did so from junk-box parts which allowed a great many modifications, some of which have been included in present day BITX-xx builds and products. If you scroll back into the older posts on the discussion group you will find those older BITX-xx related posts.? Single-band BITX transceivers have been built for almost all the HF and LF bands.? If you are interested in building your own BITX from scratch, you can benefit from learning to use a Spice Circuit Simulator ( many use LTSpice, free from Linear Technology Systems) as a way to visualize how each individual stage of the BITX actually works, and to play what-if games with the design.? Arv? K7HKL _._ On Sat, May 13, 2017 at 10:14 PM, Michael Luft <milu111@...> wrote:
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There are files on the bitx20smd at /g/BITX20/files/M0ZHN%20smdBITX This was available about 6 years or so ago but now you would have to use the gerber files to have a board made. It was basically an exciter only. You can see it at ? The version 4 was the actual production version. It couls be used on any band as the vfo, bandpass filter and PA were separate to the main board. Leonard http://kc0wox.com |
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Michael Luft
Thank you Arv :) My understanding is ?that the BITX, been a QRP radio and very much depended on the performances of the antenna, could be more satisfactory on the 20 Meters band, as the antennas for this frequency are considerably smaller, and much of us, the hams, are not very welcome among our nigbores anyway.... So, is there a SMD 20 Meter BITX, assembled or not I can buy?? reading most of the posts, I couldn't find any discussion about the trend to stick to the 40 Metres band BITX. 73 ?Mike 4X1LM 2017-05-14 19:14 GMT+00:00 Arv Evans <arvid.evans@...>:
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Michael Luft
Thank you Leonard! Very useful information indeed. 73 ?Mike 4X1LM 2017-05-14 20:18 GMT+00:00 kc0wox Leeper <kc0wox@...>:
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Building from scratch could be fun. But easy enough to mod the Bitx40 for use on 20 meters. ?Only changes required would be the bandpass filter at L1,L2,L3 and the output lowpass filter at L6,L7, just borrow coil and cap values from old 20 meter versions. ?Also need a minor hack to the Raduino sketch to move the VFO frequency. ?Alternately, sit on your hands till the all-band uBitx comes out. |
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Trent Trent
Does anyone know when the uBitx comes out and doesnt the current bitx have poor gain on 20m due to the transistors On 16 May 2017 4:47 am, "Jerry Gaffke via Groups.Io" <jgaffke=[email protected]> wrote:
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I doubt even Farhan knows when any remaining issues will be resolved on the uBitx. ?But you are welcome to do a scratch build and help with the process. The Bitx started out as a 20m rig, as the name of this group suggests, and was very successful. ?Also successful as a 17m rig. ?Why do you think it might have a gain issue?? On Mon, May 15, 2017 at 12:33 pm, Trent Trent wrote:
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All that old Yahoo stuff has been copied to this forum on groups.io Here's the very first post from early 2004: ?/g/BITX20/message/1 Jerry On Mon, May 15, 2017 at 01:34 pm, Al Duncan VE3RRD wrote:
Also check the old posts and info on the original Yahoo Group at ? ? |
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Mike:
At present, there is no smd BITX20 kit available. As mentioned by Leonard, the Eliamady smd20 kit was available some time ago. It is actually a 3-mode multiband core unit, and can be adapted to multi-band use. I have 1 unit; I had 2 boards but sold one some time ago. It is quite a nice unit if you should pursue getting boards made on your own -- but securing all the parts may be quite a task in itself. It could be made with a VFO or DDS (for multi-band). That being said, you can easily adapt the BITX40 smd rig to 20m (or any other HF band for that matter). There are hints and mods throughout this list which can be used, including some noted since the release of the BITX40. That is what I would do if I wanted a BITX20 (or BITXnn). This is in the tradition of the earlier BITX units; the original was adapted to many bands by lots of different builders. Probably F8VOA (see files) has the best generic modular adaptation. Or you can wait for the release of the uBITX, which is esentially a much modified minima xcvr. That shouldn't be too long now; Farhan is even now showcasing it at FDIM. There are yet some bugs to work out, but they should be done soon, as Jerry notes. john AD5YE |
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Jack Purdum
$190 seems a tad steep. Jack, W8TEE From: KM4TRT via Groups.Io <garello@...> To: [email protected] Sent: Monday, May 15, 2017 6:08 PM Subject: Re: [BITX20] SMD 20M BITX20 Pacific Antennas (QRP Kits) is still selling the kit version of the bitx-20 complete with case. ANG
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Seems steep only because hfsigs has spoiled us rotten. Was a very reasonable price a year or two ago. Jerry On Mon, May 15, 2017 at 04:54 pm, Jack Purdum wrote:
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$190 is a bit steep. But it includes the case and the digital readout.
Also, this is the BITX20A and BITX17A. These kits include a major redesign of the original BITX, with a dual IRF510 PA and US FCC compliance. The BITX20 V.3 (which is now the v.3C) is much closer to the original, and does not include FCC compliance. The builder has to figure out a way to make the rig legal in the USA. It is also quite expensive compared to the original kit. Both of these designs are good kits for the average QRPer. I sort of lean towards the BITXnnA, but it is now probably a bit much for the average ham. john AD5YE |
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Jack Purdum
I honestly don't know what the cost is to meet FCC compliance, but I do know something about the cost of parts and cases. My concern is not what a company charges for a kit. I am a strong believer in free markets. That said, I do want to stem the tide I see where new hams get their Tech license and, for budget reasons, buy an HT to work 2M and then drop out. I've talked to several such dropouts and they all said that 2M was like "a public cell phone". Clearly, they did have a diverse ham experience. My hope is for an effective SSB rig for 40M running about 10W that a high school or college student can afford and experience what the HF bands have to offer over and above a cell phone. The BITX40 does that.? I bought my BITX40 when there was no VFO or LCD display, so I set about adding one, just like many others. Ashar beat me to the punch by adding those features, but to his credit, he convinced the distributor to keep the price down. I think the uBITX will play an ever more important role in attracting young hams to move up from Tech to General and Extra. We need young people in our ranks and joining our clubs, not old fossils like me. That's not to say we can't help "Elmer" them along, and show them the fun of HF, CW, digital modes, homebrewing, and all the other elements that make our hobby what it is.? As to the BITX20, I want new hams to know alternatives exist. When you think about it, the difference between the BITX20 and BITX40 is the case, dual IRF510's, and FCC complance weighed against no case, all PCB components in place, a single IRF510, and mounting the controls yourself. (Since both are kits, FCC compliance may be less of an issue, plus members of the users group would jump in with mods to fix it if demanded.) A new ham not bound by a lawn-mowing budget may prefer the B20 at the higher price point because of its features and looks. Someone with less deep pockets needs to know about the alternative. Making them aware they have choices is a good thing. I don't know the precise impact of their work, but I know that the efforts of Ashar, Allard, Jerry, and many others in this group have caused a lot of people to "take the plunge" into QRP, kit-building, and experiencing new aspects of our hobby. More importantly, they well may have kept them from dropping out of our ranks. The more who stay, the healthier our hobby becomes...to everyone's benefit. (Climbing down from soapbox...) Jack, W8TEE From: John Backo via Groups.Io <iam74@...> To: [email protected] Sent: Monday, May 15, 2017 9:25 PM Subject: Re: [BITX20] SMD 20M BITX20 $190 is a bit steep. But it includes the case and the digital readout. Also, this is the BITX20A and BITX17A. These kits include a major redesign of the original BITX, with a dual IRF510? PA and US FCC compliance. The BITX20 V.3 (which is now the v.3C) is much closer to the original, and does not include FCC compliance. The builder has to figure out a way to make the rig legal in the USA. It is also quite expensive compared to the original kit. Both of these designs are good kits for the average QRPer. I sort of lean towards the BITXnnA, but it is now probably a bit much for the average ham. john AD5YE |
开云体育Jack, Well said. My kids are grown but when they weren't I spent quite a bit of time with kids in Scouts, coaching, etc. There were plenty of boys and some girls fascinated by the Arduino, Linux, Raspberry etc, i.e., open-ended electronics that were free or close to it. ?All they had to supply was the enthusium and energy of which they had plenty. ?I see the Bitx as an excellent example of all of this plus ham radio. 73, Pat AA4PG
Pat Griffin
http://www.cahabatechnology.com
From: [email protected] <[email protected]> on behalf of Jack Purdum via Groups.Io <econjack@...>
Sent: Monday, May 15, 2017 9:11:10 PM To: [email protected] Subject: Re: [BITX20] SMD 20M BITX20 ?
I honestly don't know what the cost is to meet FCC compliance, but I do know something about the cost of parts and cases. My concern is not what a company charges
for a kit. I am a strong believer in free markets. That said, I do want to stem the tide I see where new hams get their Tech license and, for budget reasons, buy an HT to work 2M and then drop out. I've talked to several such dropouts and they all said that
2M was like "a public cell phone". Clearly, they did have a diverse ham experience. My hope is for an effective SSB rig for 40M running about 10W that a high school or college student can afford and experience what the HF bands have to offer over and above
a cell phone. The BITX40 does that.?
I bought my BITX40 when there was no VFO or LCD display, so I set about adding one, just like many others. Ashar beat me to the punch by adding those features, but
to his credit, he convinced the distributor to keep the price down. I think the uBITX will play an ever more important role in attracting young hams to move up from Tech to General and Extra. We need young people in our ranks and joining our clubs, not old
fossils like me. That's not to say we can't help "Elmer" them along, and show them the fun of HF, CW, digital modes, homebrewing, and all the other elements that make our hobby what it is.?
As to the BITX20, I want new hams to know alternatives exist. When you think about it, the difference between the BITX20 and BITX40 is the case, dual IRF510's, and
FCC complance weighed against no case, all PCB components in place, a single IRF510, and mounting the controls yourself. (Since both are kits, FCC compliance may be less of an issue, plus members of the users group would jump in with mods to fix it if demanded.)
A new ham not bound by a lawn-mowing budget may prefer the B20 at the higher price point because of its features and looks. Someone with less deep pockets
needs to know about the alternative. Making them aware they have choices is a good thing.
I don't know the precise impact of their work, but I know that the efforts of Ashar, Allard, Jerry, and many others in this group have caused a lot of people to "take
the plunge" into QRP, kit-building, and experiencing new aspects of our hobby. More importantly, they well may have kept them from dropping out of our ranks. The more who stay, the healthier our hobby becomes...to everyone's benefit.
(Climbing down from soapbox...)
Jack, W8TEE
From: John Backo via Groups.Io <iam74@...> To: [email protected] Sent: Monday, May 15, 2017 9:25 PM Subject: Re: [BITX20] SMD 20M BITX20 $190 is a bit steep. But it includes the case and the digital readout.
Also, this is the BITX20A and BITX17A. These kits include a major redesign of the original BITX, with a dual IRF510? PA and US FCC compliance. The BITX20 V.3 (which is now the v.3C) is much closer to the original, and does not include FCC compliance. The builder has to figure out a way to make the rig legal in the USA. It is also quite expensive compared to the original kit. Both of these designs are good kits for the average QRPer. I sort of lean towards the BITXnnA, but it is now probably a bit much for the average ham. john AD5YE |
Andrew Mason - VK4LK