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Re: BPF's
Clear coat is what I have handy. Wanted something quick and easy to use. 73 Ken VA3ABN On Tue, Dec 27, 2016 at 9:13 PM, Richard Knack ihc73scout2@... [BITX20] <BITX20@...> wrote:
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Re: BPF's
Why not use coil dope? The commercial stuff isn't cheap, but it's just polystyrene dissolved in MEK, so not hard to make. Rich KC8MWG On Tuesday, December 27, 2016 9:05 PM, "Ken Chase chase8043@... [BITX20]" wrote:
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Re: A more stable Bitx40 (fun with ceramic resonators)
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On Dec 27, 2016, at 5:08 PM, cruisenewsnet@... [BITX20] <BITX20@...> wrote:
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Re: A more stable Bitx40 (fun with ceramic resonators)
The usual suspects: Mouser, Digikey, Farnell, and Jameco. Todd K7TFC On Dec 27, 2016 5:08 PM, "cruisenewsnet@... [BITX20]" <BITX20@...> wrote:
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Ashhar Farhan CNN Intervew (08-May-05, 20:00 UTC)
Hi Colleagues Please, can someone have available this interview? -Ashhar Farhan was interviewed for a CNN report (08-May-05, 20:00 UTC) on the Amateur Radio contribution to the Asian Tsunami disaster relief effort (see photo).? The program is 7 minutes long, but there is a?29 second?clip showing the BITX20 and Farhan's interview. View the 29s video: I want to show it, to the "newbies" and all other ?Cuban Amateurs Radio do not know it. I'll appreciate the help I am in need. Qrv's 73's Jc |
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Re: troubleshooting the bitx40 receiver
Microwave that tap washer alongside a glass of water. A microwave oven needs something to absorb all that energy. I once tried microwaving half the recommended amount of popcorn. The magnetron blew in a most spectacular fashion, with high voltage arcs lighting up the room. I now have a nice high voltage transformer and metal cabinet,? well on my way to building a tube type linear amp for the Bitx40. Jerry, KE7ER? ---In BITX20@..., <farhanbox@...> wrote : at the power levels of the band pass filter, there is no fear of the tap washer being saturated. to test this, try microwaving it. ? |
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Re: tuning step size for the SI5351 / Radunio version
On Dec 27, 2016 10:17 AM, "Sandeep Lohia" <sandeeplohia12@...> wrote: > Carbon film Pot don't last long if not wire wound, VU2DEV was also trying as to use a carbon Pot with link below, a couple of weeks ago. Also got codes for 20 Meter for above link using 10 Mhz IF. & for above one can just switch off external counter after read, & thus abatement?of birdies... |
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Re: tuning step size for the SI5351 / Radunio version
Jack Purdum
It could definitely be annoying if the tuning rate isn't set to your preferences. I used symbolic constants (e.g., #define INCREMENT) to set the increment and the time delay in the code before the fast tune kicked in. Using symbolic constants makes it easy to experiment until you find a combo that works for you. I messed around with these two constants until I found a rate that seemed "natural" to me. Now I wish my other rigs had it! Peter Parker (VK3YE) has a YouTube video where he used an approach similar to yours to add capacitance into the circuit to alter the range that the VXO covered. Jcak, W8TEE From: "jgaffke@... [BITX20]" To: BITX20@... Sent: Tuesday, December 27, 2016 1:07 PM Subject: Re: [BITX20] tuning step size for the SI5351 / Radunio version
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The encoder with variable increment step could be made to work well. On the other hand, I have a Tecsun consumer radio that does that and it annoys me no end how it more or less arbitrarily flips between fast and slow tuning rates. Might be a matter of whacking at the algorithm that flips between fast and slow. And might be a matter of personal preference. ? Unfortunately, the Tecsun does not have a USB port into an Arduino. Me, I think I'll go for minimum hand motions to get the desired result. And I think the two switch scheme is getting close. Moving my hands side-to-side at the wrist seems more natural than up-down, and quite a bit better than having to turn something. Will be fun to try various schemes. Jerry, KE7ER ---In BITX20@..., wrote : ?(19785Re: [BITX20] tuning step size) on the 26th about using the spin rate of the encoder? shaft to automatically change the increment step. ?? |
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Re: tuning step size for the SI5351 / Radunio version
Ha haa, that's true Todd :D Jerry, I used kind of this :? For this :? ( can be used for BITX 40, firmware is already for 12 MHz IF, & AD9833 from Analogue Device ;) but unfortunately did not find spring loaded ( so called paddel ) in my city, which will come to off position automatically... 'Repair & Reuse or Recycle E-Waste' |
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Re: tuning step size for the SI5351 / Radunio version
The encoder with variable increment step could be made to work well. On the other hand, I have a Tecsun consumer radio that does that and it annoys me no end how it more or less arbitrarily flips between fast and slow tuning rates. Might be a matter of whacking at the algorithm that flips between fast and slow. And might be a matter of personal preference. ? Unfortunately, the Tecsun does not have a USB port into an Arduino. Me, I think I'll go for minimum hand motions to get the desired result. And I think the two switch scheme is getting close. Moving my hands side-to-side at the wrist seems more natural than up-down, and quite a bit better than having to turn something. Will be fun to try various schemes. Jerry, KE7ER ---In BITX20@..., <econjack@...> wrote : ?(19785Re: [BITX20] tuning step size) on the 26th about using the spin rate of the encoder? shaft to automatically change the increment step. ?? |
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Re: tuning step size for the SI5351 / Radunio version
Jack Purdum
Jerry: See my earlier post (19785Re: [BITX20] tuning step size) on the 26th about using the spin rate of the encoder? shaft to automatically change the increment step. Jack, W8TEE From: "jgaffke@... [BITX20]" To: BITX20@... Sent: Tuesday, December 27, 2016 11:14 AM Subject: Re: [BITX20] tuning step size for the SI5351 / Radunio version
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Anybody having trouble with noisy pots on their Bitx? I'm happy with the volume controls on the consumer gear I have, I assume they are all carbon. ?Though after years of use, they can get scratchy, that would happen much faster in a marine environment. ?Using a pot for frequency control would be a severe test for "scratchyness". ?A wirewound pot can cost almost as much as the whole kit currently does, not an option. ?A good encoder could be more robust, though you will spend a lot of time spinning that little knob. ? Here's another possibility: ?A three position momentary paddle switch, center off, left to go down in freq at a rate of about two ticks per second, and right to go up. ?A second momentary paddle switch for the other hand allows you to cycle up and down through a list of ?1,10,100,1000,10000,100000 Hz per tick, and possibly BandSelect. ?If you already have the first switch closed and then also close the second switch, that two tick per second rate is adjusted to be faster or slower. ?A scheme like this seems far less likely of giving me carpal tunnel syndrome than an encoder. That's what's nice about this rig. ?Getting around something like noisy pot issues will be a matter of hacking up a Raduino sketch and some junkbox parts. Jerry, KE7ER ? ? ---In BITX20@..., wrote :? Carbon film Pot don't last long if not wire wound, Rotary encoders costs as little as Rs 70/-? |
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Re: tuning step size for the SI5351 / Radunio version
Jerry I had switched my vfo to a DDS, so I have no experience with the pot as an encoder. I did find my volume very scratchy and switched to a new audio taper pot. 73 Ken VA3ABN On Tue, Dec 27, 2016 at 11:14 AM, jgaffke@... [BITX20] <BITX20@...> wrote:
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Re: tuning step size for the SI5351 / Radunio version
On Dec 27, 2016 4:27 AM, "John jstoole@... [BITX20]" wrote: >> . . . why are we trying to re-invent the wheel!!!!<< Because the fun is in the inventing, not just owning, the wheel. ;-). 73, Todd K7TFC |
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Re: BITX40 - 50Khz birdies
¿ªÔÆÌåÓýPossibly from oscillator of Arduino? Or if the LCD has an LED back light. I have noticed LEDs that light up my microphone buttons do this. Regards Dave G4UFS On 27 Dec 2016, at 17:00, ronvandoremalen@... [BITX20] <BITX20@...> wrote:
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Re: tuning step size for the SI5351 / Radunio version
Anybody having trouble with noisy pots on their Bitx? I'm happy with the volume controls on the consumer gear I have, I assume they are all carbon. ?Though after years of use, they can get scratchy, that would happen much faster in a marine environment. ?Using a pot for frequency control would be a severe test for "scratchyness". ?A wirewound pot can cost almost as much as the whole kit currently does, not an option. ?A good encoder could be more robust, though you will spend a lot of time spinning that little knob. ? Here's another possibility: ?A three position momentary paddle switch, center off, left to go down in freq at a rate of about two ticks per second, and right to go up. ?A second momentary paddle switch for the other hand allows you to cycle up and down through a list of ?1,10,100,1000,10000,100000 Hz per tick, and possibly BandSelect. ?If you already have the first switch closed and then also close the second switch, that two tick per second rate is adjusted to be faster or slower. ?A scheme like this seems far less likely of giving me carpal tunnel syndrome than an encoder. That's what's nice about this rig. ?Getting around something like noisy pot issues will be a matter of hacking up a Raduino sketch and some junkbox parts. Jerry, KE7ER ? ? ---In BITX20@..., <sandeeplohia12@...> wrote :? Carbon film Pot don't last long if not wire wound, Rotary encoders costs as little as Rs 70/-? |
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Re: Tracking shipment
Thanks, Ron, Good information! Roy WA0YMH On Dec 27, 2016 9:58 AM, "ron van doremalen ronvandoremalen@... [BITX20]" <BITX20@...> wrote:
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Re: Tracking shipment
¿ªÔÆÌåÓýYou get tracking number when paypall notifies on shipment. You can use India Post tracker (aftership). ? Could at least follow it until in Amsterdam. ? Ron ¨C PA3FAT ? Van: BITX20@... [mailto:BITX20@...]
Verzonden: 27 December, 2016 16:47 Aan: BITX20@... Onderwerp: [BITX20] Tracking shipment ? ? Can anyone that's already received a BITX40 tell me if you get any emails that confirm when the order is shipped or even maybe a tracking number? Or is it just a surprise when it shows up?
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Joel Caulkins/N6ALT
Todd K7TFC