Re: uBITX Version 4 first attempt
#ubitx-help
#ubitx
Brian L. Davis
There are literally thousands of these radios in the hands of users and only a very, very few have had any problems.
They work as advertised if built in a reasonable fashion, something Farhan has no control over. As far as delivery, I am in Oklahoma, USA and mine arrived in pristine condition as have nearly all others. You DO NOT have to replace any components. You DO NOT have to rip out components and bodge the pcb to get it to work. You DO NOT have to make any modifications to make it work. If you have a postal delivery problem, complain to them, Farhan did not damage your mail. This is a very, very inexpensive radio and you can modify it if you want but YOU DON'T HAVE TO. If you would read the posts here you would find that you are nearly alone in your complaints and criticisms! There is an old saying that some people would complain about being hung with a new rope. I believe that would be appropriate in this instance.
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Understanding Spurious Emissions
Howard Fidel
There have been a few threads discussing how the uBitx has spurs that may exceed the spur amplitude allowed by law. Ham radio is regulated by Part 97 of the FCC regulations. The allowed spur amplitude for frequencies below 30 MHz is in section 307. I have reproduced paragraph D below:
(d) For transmitters installed after January 1, 2003, the mean power of any spurious emission from a station transmitter or external RF power amplifier transmitting on a frequency below 30 MHz must be at least 43 dB below the mean power of the fundamental emission. For transmitters installed on or before January 1, 2003, the mean power of any spurious emission from a station transmitter or external RF power amplifier transmitting on a frequency below 30 MHz must not exceed 50 mW and must be at least 40 dB below the mean power of the fundamental emission. For a transmitter of mean power less than 5 W installed on or before January 1, 2003, the attenuation must be at least 30 dB. A transmitter built before April 15, 1977, or first marketed before January 1, 1978, is exempt from this requirement. The first interesting thing about these regulations is that they are not consistent across time. If you have a transmitter that was installed before April 15, 1977 it is not even regulated for spurious emissions. Before 2003, the spurs were limited to 50 mW max and must be at least 40 dB below the carrier power. Today, the constraint is -43 dB below the carrier power. So if you have a 1 KW transmitter, you are allowed to have spurs that do not exceed 50 mW, hence the earlier 50 mW limit. To keep things in perspective, if your uBitx puts out 5 watts of power on 15 meters, 50 mW of energy would be only 20 dB down from your carrier. So if you use your uBitx barefoot (i.e without a linear amp) although you may exceed the allowed spur amplitude on the 15 and 10 meter bands, your radiated power level will be so low that it is virtually impossible for it to interfere with other services, and that your radiated emissions maybe in line with what other ham operators are radiating legally. Also, I might add that these spurs are not consistent in amplitude from unit to unit. I measured mine as being in compliance, but right at the -43 dB limit. Furthermore, the testing is done into a dummy load. When connected to an antenna, your SWR at the spur frequency is probably high, so you are radiating even less energy. My personal take away from this is that although the uBitx may at times not be in technical compliance with the regulations, operating at frequencies above 21 MHz, it is in compliance with the intent of the law, which is to prevent interference with other services. You can help your uBitx stay in-compliance by not over driving your audio, and by only operating it barefoot above 21 MHz. So, the bottom line is you should not use the uBitx above 21 MHz if you are concerned with the letter of the law, but you may use it if you are concerned with complying with the intent of the law. Howard
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Re: I'm really stuck! No Xmit Pwr.
#ubitx
I will see if I can come up with a germanium diode.
I do have a digital storage o'scope... trying . Pay day is a ways off and I am tapped out so no more orders to the parts place this week. but have a wealth of junk just will take a bit. I appreciate everything that everyone is suggesting. Thank you Frustrated Ham N5FJK Chip
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Re: RF power chain mods and improvements..
Dave de WS1ETI <docame12@...>
Allison, Jerry, I understand swapping out the 3904s with 2n2222s, but why not stay with the TO-92 package rather than change to the TO-18?
Just a noob question from someone who does not yet know better! Dave, WS1ETI
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Re: uBITX Version 4 first attempt
#ubitx-help
#ubitx
Group, I have 5 bitX
transceivers, 2 Hendricks and 3 from Ashar. I really like my
units (all
of them). I have to admit that I did have problems with my bitX40 but that was my fault. My meter was defective and when I went to adjust the bias my meter read zero so I cranked up the drive and burned out my final. I fixed it and all is well. I have to admit that the audio can be improved by adding an agc circuit but that is not really necessary if you just adjust the volume control to suit the strong or weak signal coming in. My last purchase was the original uBitX and this time I did nothing to it. Yes, it can be improved but I haven't done that yet. I am having too much fun using it. I am in Iowa and my first contact was in California and since then I have logged about 15 States. On 40 I spent 10 minutes trying to get through a pile up of stations calling a station in Spain. I think that I could have logged him if I only had a little more time, he was 20 over on 40. I say all this just to prove one point, this transceiver works out of the box without any mods and all you have to supply is power and a case. If I'm getting over 5 watts, I'm happy. If I need more power I have my 100 watt rig and if that doesn't do it I use my Dentron amp for 1600 watts out. Its more fun doing it with 5 watts. Ashar has done a great job getting this unit out to us and we shouldn't complain about his excellent work. Ive seen it all (ham for 64 years) Ed W0OIC On 6/20/2018 7:49 AM, Jack Purdum via
Groups.Io wrote:
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Re: uBITX Version 4 first attempt
#ubitx-help
#ubitx
Arv Evans
Ray G7BHQ None of those mods are required for the transceiver to operate properly. The audio was not an issue until someone who did not understand push-pull follower circuit biasing proclaimed that the circuit would never work. Arv k7hkl _-_ Sent from my Verizon, Samsung Galaxy smartphone
-------- Original message -------- From: "Ray Koster via Groups.Io" <raykoster@...> Date: 6/20/18 7:57 AM (GMT-07:00) To: BITX20@groups.io Subject: Re: [BITX20] uBITX Version 4 first attempt #ubitx-help #ubitx Why are you Guy's sticking up for Farhan, when he does not come forward and hold his hands up and say that the kit should have never gone to market.If this was UK produced ,then Trading Standards would have closed HF Signals down long ago!!! No one can expect a builder to rip out components and bodge the pcb to get it to work. This is not a user friendly board as it is all surface mounted and if you dont have good eye sight and the correct equipment then it will end up as a bin job!! Also most builders do not have the correct test equipment to make tests to insure that after all these mod's, they are legal when on the air with this kit My biggest beef about all this is that HF Signals cannot deliver a kit to me that is not damaged in the post and please dont tell me I have pissed of the postman, My postman is a nice guy and so are the staff at the sorting office and India to the UK is a very long way I paid good money for a Bitx 40 and a Ubitx V3 and both were received damaged, a replacement Bitx was sent and that was also received damaged. When I pay good money, I expect to receive the goods in a usable state and then I do not expect to have to then remove and replace most of the components at my expense, and probably have to wait weeks for these new components to come in, just to get it to work correctly Firmware updates are acceptable as the nature of the code can led to bugs creeping in and this is a very easy thing to do and does not require butchery of the pcb Ray Koster G7BHQ
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amp for ubitx4
Richard E Neese <kb3vgw@...>
put this amp inbetween the board and the speaker and you can increase autio out
https://www.adafruit.com/product/2130?gclid=CjwKCAjw9qfZBRA5EiwAiq0AbSjlc2MSLgWwWZQtwnV-hNw_drDbNvlDiT6BGaFmHKQU-_U0eyEEtRoCt4oQAvD_BwE
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Re: uBITX Version 4 first attempt
#ubitx-help
#ubitx
Ray Koster
I think that Andy is correct in thinking why he should have to do all these mods to this kit!! I also have purchased and built several kits in the past and have never had to do the scale of modifications that are now required to get this kit to work correctly. It was never disclosed on the HF signals website that it will be required by the builder to almost replace every component to make the rig work and be legal on the air.
Why are you Guy's sticking up for Farhan, when he does not come forward and hold his hands up and say that the kit should have never gone to market.If this was UK produced ,then Trading Standards would have closed HF Signals down long ago!!! No one can expect a builder to rip out components and bodge the pcb to get it to work. This is not a user friendly board as it is all surface mounted and if you dont have good eye sight and the correct equipment then it will end up as a bin job!! Also most builders do not have the correct test equipment to make tests to insure that after all these mod's, they are legal when on the air with this kit My biggest beef about all this is that HF Signals cannot deliver a kit to me that is not damaged in the post and please dont tell me I have pissed of the postman, My postman is a nice guy and so are the staff at the sorting office and India to the UK is a very long way I paid good money for a Bitx 40 and a Ubitx V3 and both were received damaged, a replacement Bitx was sent and that was also received damaged. When I pay good money, I expect to receive the goods in a usable state and then I do not expect to have to then remove and replace most of the components at my expense, and probably have to wait weeks for these new components to come in, just to get it to work correctly Firmware updates are acceptable as the nature of the code can led to bugs creeping in and this is a very easy thing to do and does not require butchery of the pcb Ray Koster G7BHQ
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Re: uBITX Version 4 first attempt
#ubitx-help
#ubitx
sridhar
Farhan cannot manage your expectations nor is he required to do so.
Agreed...especially at a $140 pricepoint. yes de vu3pen sridhar
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Re: ND6T AGC and Click kit wiring notes
I'm liking the board mount with the 3 pins...
Thanks de n2aie
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Re: uBITX Version 4 first attempt
#ubitx-help
#ubitx
I have read about some audio issues, but I haven't experienced it. Did I just get lucky, or is the audio a universal issue? Jack, w8TEE
On Wednesday, June 20, 2018, 9:10:50 AM EDT, jocarl011 <jocarl011@...> wrote:
Jack. I think the complaints from Alex are about the audio stage on the V4 boards. Andy. This has only come to light in the last week or so, and I’m sure Farhan will be addressing the issue with the audio asap. There are a few “workaround” mods that can be done if you search on here. Just remember this radio cost next to nothing compared to the competition. It was created to be modified anyway so if a small mod is needed to better the audio then that’s not the end of the world. Now if you had bought an Elecraft KX3 with this issue then you would more than have a point! 😉 Carl M0CLS.
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Re: uBITX Version 4 first attempt
#ubitx-help
#ubitx
Farhan cannot manage your expectations nor is he required to do so. Agreed...especially at a $140 pricepoint. Jack, W8TEE
On Wednesday, June 20, 2018, 9:13:09 AM EDT, Tim Gorman <tgorman2@...> wrote:
The big questions here are: 1. Does the radio work? 2. Does the radio work up to your expectation? If the radio satisfies question 1 then Farhan has done his job. If the radio does not satisfy question 2 then the issue is your expectations. Farhan cannot manage your expectations nor is he required to do so. You are the one that must manage your expectations. tim ab0wr On Tue, 19 Jun 2018 22:43:45 -0700 "Andy V. Borisenko via Groups.Io" <rw9rn=mail.ru@groups.io> wrote: > gentlemens. > I bought several KITs, several finished products from different > manufacturers, but I never got into this relationship with a client > like Farhan. no reaction to bad a main board v4. I the buyer. I paid > the money to not have problems with the assembly of the > transceiver. why should I remodel something in a READY product? but > if I do not know how, I do not want to, I can not do it? remake and > improve everything is possible. it's not that. but in relation to the > seller to the buyers. and this is a very bad attitude. Farhan does > not solve the problem, which is. > > >
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Re: uBitx has a bit too crispy / semi-distorted audio even on low signal levels
#ubitx
#ubitx-help
W3JDR
Mike
Sorry for the delayed reply...I was on vacation. The Q70 mod will only affect extremely strong signals near the receiver's saturation point. My audio on an unmodified board is pretty good, so I think the problem lies elsewhere. Joe
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Re: Raduino CAD Files
W3JDR
Hi Guys!
I'm back from my vacation and today I finished the board design and sent the CAD files out for fabrication. These come from China, so it will take a few weeks. I'll advise when I get them. Hoping I didn't make any major errors....fingers crossed! Joe W3JDR
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Re: uBITX Version 4 first attempt
#ubitx-help
#ubitx
Tim Gorman
The big questions here are:
1. Does the radio work? 2. Does the radio work up to your expectation? If the radio satisfies question 1 then Farhan has done his job. If the radio does not satisfy question 2 then the issue is your expectations. Farhan cannot manage your expectations nor is he required to do so. You are the one that must manage your expectations. tim ab0wr On Tue, 19 Jun 2018 22:43:45 -0700 "Andy V. Borisenko via Groups.Io" <rw9rn=mail.ru@groups.io> wrote: gentlemens.
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Re: uBITX Version 4 first attempt
#ubitx-help
#ubitx
M0CLS
Jack.
I think the complaints from Alex are about the audio stage on the V4 boards. Andy. This has only come to light in the last week or so, and I’m sure Farhan will be addressing the issue with the audio asap. There are a few “workaround” mods that can be done if you search on here. Just remember this radio cost next to nothing compared to the competition. It was created to be modified anyway so if a small mod is needed to better the audio then that’s not the end of the world. Now if you had bought an Elecraft KX3 with this issue then you would more than have a point! 😉 Carl M0CLS.
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Re: Homebrew from scratch
#ubitx
There's a lot to be said for the bus approach to building anything. Remember the S-100 bus in the early computers? Early versions suffered from ringing on the bus, but that was quickly solved and the bus was serviceable for many years. As far as serving as the platform for experimenters like so many of us here are, a bus kinda make sense. Alas, I wouldn't know a "good" bus if it sneaked up and bit me in the butt. However, I'm sure there are many here who do. This might be a fun direction to go. Jack, W8TEE
On Tuesday, June 19, 2018, 11:21:00 PM EDT, w7hd.rh <w7hd.rh@...> wrote:
FYI - I used the same approach when designing the Heath SB103
transceiver chassis back in the early 1970's. With vertical solid
metal separators, we were able to achieve some impressive
isolation between modules. The only wires were to the rear panel
connectors and front panel controls. When we were forced into
using tube finals, those had to be wired, of course (we originally
did a totally solid-state final). Everything else was handled by
the motherboard. The vertical separators also gave the chassis
rigidity and you could literally jump up and down on the radio
without affecting anything. It also facilitated the design
process, since we could swap boards in and out, even using an
extender to bring it up above the chassis. We had a reference
oscillator with 1 ppm/year drift (measured) without using an oven,
also (my design). Ron W7HD On 06/19/2018 06:35 PM, VK3HN wrote:
Several have explored modules for BiTX/uBiTx. Paul M0XPD is one: http://m0xpd.blogspot.com/2014/08/plug-in-bitx-modules.html -- Ron W7HD - NAQCC#7587 OMISS#9898 KX3#6966 LinuxUser#415320 Editor OVARC newsletter
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Re: I'm really stuck! No Xmit Pwr.
#ubitx
Arv Evans
Dave A screened enclosure is nice but probably not necessary for a simple RF detector as long as you don't have any long leads on the RF side. The DC side is bypassed for RF and can be either twisted wires or coax with the shield grounded. Many who build their own RF detector probes do so inside a plastic pen tube or build them in the open on a scrap of PCB material. If you do a Google search for RF Detector Probe and look at the images you should find lots of ideas for making this piece of test equipment. For intermittent use it probably does not have to be a work of art. Just something functional is adequate. Arv _._
On Wed, Jun 20, 2018 at 4:21 AM David Wilcox via Groups.Io <Djwilcox01=yahoo.com@groups.io> wrote:
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Re: uBITX Version 4 first attempt
#ubitx-help
#ubitx
Andy: If you follow the instructions, the rig works as advertised. Most of the modifications done by the group here are improvements each of them wanted to address. A nice site for viewing those that have worked can be found at ubitx.net, which is a great resource site. It's not clear to me what problem you are experiencing. If making the connections to the main board is the source of your discontent, I would say caveat emptor and that you didn't do your homework to find out what the kit entailed. If there is something wrong with the main board, then what have you done to contact HF Signals with a detailed statement of the problem? Finally, what exactly is the nature of your problem. There are several thousand of us loitering around here, perhaps we can help. Jack, W8TEE
On Wednesday, June 20, 2018, 1:44:11 AM EDT, Andy V. Borisenko via Groups.Io <rw9rn@...> wrote:
gentlemens.
I bought several KITs, several finished products from different manufacturers, but I never got into this relationship with a client like Farhan. no reaction to bad a main board v4. I the buyer. I paid the money to not have problems with the assembly of the transceiver. why should I remodel something in a READY product? but if I do not know how, I do not want to, I can not do it?
remake and improve everything is possible. it's not that. but in relation to the seller to the buyers.
and this is a very bad attitude.
Farhan does not solve the problem, which is.
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Re: I'm really stuck! No Xmit Pwr.
#ubitx
David Wilcox <Djwilcox01@...>
The directions indicate a screened enclosure. Some of the previous kits I have built have these power indicators included built on a perf board but no mention of enclosure. Is an enclosure just to increase accuracy and prevent extraneous signals from overloading some of the circuits? Dave K8WPE
On Jun 19, 2018, at 7:05 PM, Arv Evans <arvid.evans@...> wrote:
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