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- BITX20
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Still Not Working
Hi guys, those of you that saw my posts earlier in the week know that I have not been able to transmit with my Bitx40. It was sort of determined after going back and forth with a few of you that the final was blown in my radio. From the moment that I turned on the radio I've had a dummy load on it so I was really going to be surprised if the final was blown but it was worth a try for all the more the replacement IRF510's cost.?
Well I'll I unsoldered the original final and installed a new one that I bought from Digikey and it still doesn't work. Power on with no speaker attached it pulls 150mA. With the mic keyed it pulls 267mA. The blue trim pot has no impact on receiving or transmitting current. It's rock solid at the values listed above. I don't see any imperfections on the board and I hear the relays pulling in when I key up. I have power connected to the PA connection.? As much as I want this to work I really feel like giving up and that I've been had by Mr Farhan. I know that may be a cardinal sin for saying that on here but it seems like I have no recourse other than to turn him into PayPal at this point in time. I'll admit I'm an Electronics Technician although a little rusty after being away from component level troubleshooting for the last 25 years. I don't think it's been too much to ask that as long as I didn't make any wiring mistakes that this should at least receive and transmit after doing the wiring. Any help would be greatly appreciated.? |
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Re: Crystal matching for ubitx
Farhan is right. It is less important that the signal level be as such and such,
than that they be frequency matched as closely as possible. Of course it helps if they exhibit about the same activity, but it is secondary. I think what you have is the one xtal in the batch which gave perfect resonance in your oscillator. Sometimes that happens! Yeah, more time at the pub... john AD5YE |
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Re: 2 BITX-40's
Hey, Ron --
I know it can be a bit of a visual pain, but really you should be worrying less about how it looks than how it performs. I have wound and mounted a lot of toroid coils and, at first, they would pull through the holes is such a way that the look was very awkward. But, as long as they were wound well and were soldered in properly, they all worked very well. I suppose one has to wind and mount a few before learning the tricks, such as pressing a bit on the coil before soldering to make it upright...but all the coils properly done with good materials worked. And that is the real test. Hi. Wait until you start winding baluns and such. Yikes! john AD5YE |
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Re: W8TEE TFT/VFO DDS adapter
Jack Purdum
Opps! First mistake since 1967...or was it this morning? Jack, W8TEE From: Vince Vielhaber <vev@...> To: [email protected] Sent: Wednesday, July 12, 2017 4:56 PM Subject: Re: [BITX20] W8TEE TFT/VFO DDS adapter Not Banggood, AliExpress.? That's twice you had me scouring Banggood looking for them cheaper ones! Vince. On 07/12/2017 02:16 PM, Jack Purdum via Groups.Io wrote: > Same source I use. If you order more than one, mention my name and ask > if you can get a discount of some kind. I don't know if he'll remember > me, but I told him I would throw business his way in hopes he would > discount on multiples. BTW, the Mega 2560 Pro from Banggood will NOT > work with my PCB. (Notice they call it Pro, not Pro Mini.) Their pin > spacing is different. I did run several of the Example programs and they > all seemed to work. Given that it costs about half the Pro Mini, it > might be worth considering if you're looking for a Mega with a smaller > footprint. > > Jack, W8TEE > > > ------------------------------------------------------------------------ > *From:* DH2LAB <dh2lab@...> > *To:* [email protected] > *Sent:* Wednesday, July 12, 2017 12:51 PM > *Subject:* Re: [BITX20] W8TEE TFT/VFO DDS adapter > > > > > > > <> > ??? Virus-free. www.avast.com > <> > > > <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> -- ? Michigan VHF Corp.? ? ? ? ? ? ? ? ? ? ? ? ? ? ? |
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Re: W8TEE TFT/VFO DDS adapter
Vince Vielhaber
Not Banggood, AliExpress. That's twice you had me scouring Banggood looking for them cheaper ones!
toggle quoted message
Show quoted text
Vince. On 07/12/2017 02:16 PM, Jack Purdum via Groups.Io wrote:
Same source I use. If you order more than one, mention my name and ask --
Michigan VHF Corp. |
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VK3YE Improved audio mod, Using a variable capacitor in place of C102
In this video, Peter shows how to modify the audio by changing capacitance at C102 (47p).? The change in audio characteristics applies to both RX and TX.? Peter shows how a slightly higher tone is an advantage while using QRP.
https://www.youtube.com/watch?v=IELJwapv5qs An alternate method to using capacitors of fixed value is to use a variable capacitor.? This allows trimming the capacitance while listening to audio.? You can select the tone you wish to hear and transmit on. The following capacitor from Digikey will fit directly into the C103 holes.? Note that C103 is parallel to C102.? If this capacitor is added, remove C102. I have done this mod and it works on RX.? You have to adjust the trimmer capacitor a bit to get good audio RX; when out of range, things sound a bit strange.? But after initial adjustments, you can fine tune it in.? I raised the tone a bit to pass more of the higher frequency audio.? I have not received any audio reports yet, so I can't speak to results on transmit. |
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Re: W8TEE TFT/VFO DDS adapter
Jack Purdum
Same source I use. If you order more than one, mention my name and ask if you can get a discount of some kind. I don't know if he'll remember me, but I told him I would throw business his way in hopes he would discount on multiples. BTW, the Mega 2560 Pro from Banggood will NOT work with my PCB. (Notice they call it Pro, not Pro Mini.) Their pin spacing is different. I did run several of the Example programs and they all seemed to work. Given that it costs about half the Pro Mini, it might be worth considering if you're looking for a Mega with a smaller footprint. Jack, W8TEE From: DH2LAB <dh2lab@...> To: [email protected] Sent: Wednesday, July 12, 2017 12:51 PM Subject: Re: [BITX20] W8TEE TFT/VFO DDS adapter |
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Re: 2 BITX-40's
chris gress
I got my first kit with a coil bent but NP I just moved it up again using no force I have glued all my coils and my bitx 40 works well I think you will find yours will? Be OK its a very good radio kit? On 12 Jul 2017 19:08, "Jack Purdum via Groups.Io" <econjack=[email protected]> wrote:
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Re: 2 BITX-40's
Jack Purdum
Can't you use your DMM and check for continuity on the bottom side of the board where the coil is soldered? What am I missing here? Jack, W8TEE From: R S via Groups.Io <rons8@...> To: [email protected] Sent: Wednesday, July 12, 2017 12:52 PM Subject: [BITX20] 2 BITX-40's Hi to all, I have been impressed with this groups willingness to offer information helping others.? In reading the posts here I have learned a lot.? Great Group! I received two bitx-40's about the 14th of June-2017.? I was very impressed with the speed of delivery.? I decided to order three metal cases from Jameco and they arrived last week.? My grandson and I got all laid out on the table and then took the two bitxs out of their cases to check for missing parts and never finished checking because of what we saw. On the first board we took out, one of the coils was laying flat.? I pulled up on it to straighten like the others.? I stopped at about 45 degrees because it seem to tighten too much to continue.? I checked and seems there are no wires pulled out.? I think its number was 138.? What to do? On the other board has the majority of the coils leaning very badly but not flat and I cannot tell if any wires are pulled loose.? I do not remember its number.? What to do? I am very concerned about pulling any farther on the coil of the?138 board and for that matter any of these coils on both kits, especially the two small coils on the second board that look yellow to me but I am old.? I just put everything back in their respective cases with a very disappointed grandson.? The second board looks like someone drove a miniature 4x4 through the coils?having a lot of fun knocking things over.? Very disappointed myself.? I bought three cases and was going to order a third BITX-40 to convert to 20m as soon as we had the first two going.? But it will surely depend on this outcome now. I will surely now have to wait for a magnifying lens that is lighted to see if anything is broken loose.? One with the sweet spot in it that magnifies more than the larger portion of the lens and with a very good light system.? Again, old with old eyes. I, my grandson and granddaughter will appreciate any and all advise here, Ron??? KJ4FFG |
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Re: Crystal matching for ubitx
Dale Brooks KG7SSB
Is there a printed circuit board available for the UBITX or will there be a board available for purchase at a later date. Dale On Wed, Jul 12, 2017 at 3:47 AM, <jim@...> wrote: Thank you both for the help, and well spotted, yes sorry, 12mhz not 20mhz, that was a?fundamental?mistake I guess :-)? |
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Shipping
Francesca Wine
There has been a problem ?in packing the board. The bubble wrap is so tight ?causing ?shorting of the ?coils. ?I had to buy ?a second board hoping ?that ?the board ?not damage. ?I complaint by email in the way ?they are ?packing ?the board. The new board works without any bent ?coils, ?first board work on the coils ?limited the shorts. So far vfo is not working. The new board has been workimg great. Lady Francesca W7LTG NV? -- I have ?bitx40 ?and completely wired up. get nice hiss when the volume up. display lights up only showing Raduino V1.01. ?frequency never shown, anyone have that problem? ?i think the software is not in the chip. Francesca W7LTG ? NV? |
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Re: 2 BITX-40's
Hi Ron Don't worry too much about the positioning of the coils, the yellow ones are the LPF and BPF, I would check the pads underneath them for continuity with a DVM, maybe move them a little*, check again, and if they pass this test, then go ahead ad assemble your BitX, have fun!On Wed, Jul 12, 2017 at 11:51 AM, R S via Groups.Io <rons8@...> wrote: Hi to all, |
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2 BITX-40's
Hi to all,
I have been impressed with this groups willingness to offer information helping others.? In reading the posts here I have learned a lot.? Great Group! I received two bitx-40's about the 14th of June-2017.? I was very impressed with the speed of delivery.? I decided to order three metal cases from Jameco and they arrived last week.? My grandson and I got all laid out on the table and then took the two bitxs out of their cases to check for missing parts and never finished checking because of what we saw. On the first board we took out, one of the coils was laying flat.? I pulled up on it to straighten like the others.? I stopped at about 45 degrees because it seem to tighten too much to continue.? I checked and seems there are no wires pulled out.? I think its number was 138.? What to do? On the other board has the majority of the coils leaning very badly but not flat and I cannot tell if any wires are pulled loose.? I do not remember its number.? What to do? I am very concerned about pulling any farther on the coil of the?138 board and for that matter any of these coils on both kits, especially the two small coils on the second board that look yellow to me but I am old.? I just put everything back in their respective cases with a very disappointed grandson.? The second board looks like someone drove a miniature 4x4 through the coils?having a lot of fun knocking things over.? Very disappointed myself.? I bought three cases and was going to order a third BITX-40 to convert to 20m as soon as we had the first two going.? But it will surely depend on this outcome now. I will surely now have to wait for a magnifying lens that is lighted to see if anything is broken loose.? One with the sweet spot in it that magnifies more than the larger portion of the lens and with a very good light system.? Again, old with old eyes. I, my grandson and granddaughter will appreciate any and all advise here, Ron??? KJ4FFG |
N8DAH
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