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Re: BPF's
Thanks Ashhar. I do the toroids solidly in place but thought a coating would help hold windings in place. 73 Ken VA3ABN On Tue, Dec 27, 2016 at 11:46 PM, Ashhar Farhan farhanbox@... [BITX20] <BITX20@...> wrote:
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Re: Ashhar Farhan CNN Intervew (08-May-05, 20:00 UTC)
ugh! i have kids now.… On 28-Dec-2016 4:29 pm, "Bill Meara n2cqr@... [BITX20]" <BITX20@...> wrote:
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Re: Ashhar Farhan CNN Intervew (08-May-05, 20:00 UTC)
Farhan, please forgive me.? The fellow asked so nicely, The video is here:? On Wednesday, December 28, 2016 3:21 AM, "iam74@... [BITX20]" wrote:
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This is probably not available, and even if it was, it would be under copyright. Note that there is a soldersmoke interview with Farhan, available for listening or download if you wish: john AD5YE ---In BITX20@..., wrote : 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 .... 73's Jc |
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Re: Buy it now vfo
开云体育Hi,I just sent my 14 dollars to hfsigs with paypal and then sent them an E-Mail and it all seems to have worked fine. Had an answering E-Mail and am just waiting for delivery. 73 Ian DJ0HF/G3ULO Am 28.12.2016 um 10:51 schrieb
gary897d@... [BITX20]:
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Re: Ashhar Farhan CNN Intervew (08-May-05, 20:00 UTC)
This is probably not available, and even if it was, it would be under copyright.
Note that there is a soldersmoke interview with Farhan, available for listening or download if you wish: john AD5YE ---In BITX20@..., <co6bg@...> wrote : 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 .... 73's Jc |
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Re: A more stable Bitx40 (fun with ceramic resonators)
?Actually, some xtals can be warped a lot more, though it may depend on the frequency and type of oscillatorI know of a model of CB SSB unit that could go quite a lot more when its "clarifier" was modified.
?just a bit of food for thought. ? Wayne WA2YNE |
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Re: Damage to SMT version bitx40 from nearby transmitter
Raj's suggestion of two back-to-back 2n4148 diodes between K1 pin 12 and ground?puts them only in the receive signal path. ?That seems the ideal spot.? Perhaps you were looking at K2 when you suggested pin 14? K2 pin 14 is only in the receive path, but does not have the benefit of the impedance of that long trace from K2 to K1, which might keep the diodes from blowing. Jerry, KE7ER ---In BITX20@..., <wa2yne@...> wrote : ?Looking at the schematic, I would put the diodes between pin 14 and ground. ?This puts them in RX? only. ? |
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Re: Damage to SMT version bitx40 from nearby transmitter
?Looking at the schematic, I would put the diodes between pin 14 and ground.
?This puts them in RX? only.?? Similar to what they used to put in 40 channel CB radios, in the RF receive a,p, for exactly the same reason. RF amps were getting blown? by transimissiona close by. ?It was a mod that Cobra/Dynascan approved, if? recall right. ?Been so many years since I worked on them under warranty. ?DE WA2YNE |
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Re: A more stable Bitx40 (fun with ceramic resonators)
开云体育I have found that most three leg ceramic resonators are resistant to frequency pulling due to the two internal caps, some will pull further than others. YMMV. Joel Caulkins KB6QVI On Dec 27, 2016, at 6:19 PM, geocrasher@... [BITX20] <BITX20@...> wrote:
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Re: BPF's
Thomas Noel
开云体育You might get by with a high stearic acid content paraffin wax, but it might just melt and rum all over if left in the car on a summer day. ;>)Thomas W Noel KF7RSF
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Re: BPF's
Bees wax is a better choice! Like in old radios.
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I always keep a bit around. 73 Raj At 28/12/2016, you wrote:
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Re: BPF's
you don't realy nees a coating, i have used a spot of superglue to hold it down to the board. it seems to have no perceptible difference. - f On 28-Dec-2016 7:41 am, "Ken Chase chase8043@... [BITX20]" <BITX20@...> wrote:
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Re: New Group Member and pre-Raduino arduino purchaser
Don Cota
Thank you for the fast response!
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Sent from Y! Mail on my Samsung Galaxy S7
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Re: New Group Member and pre-Raduino arduino purchaser
Welcome to the group!
Ashhar answered this on Dec 24, message 19700. Wiring for a Bitx40 without the Raduino can be found at ? ?? Jerry, KE7ER ---In BITX20@..., <don.cota@...> wrote : I was wondering if there were instructions to make it work as is without the Raduino? ? |
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Measuring capacitance and other stuff
Here's a very cool example of something you could do with the Raduino. ? ?? Imagine you are off on an island somewhere, a Bitx was dropped from the sky?but doesn't quite work. Would be nice to have a DC voltmeter, perhaps using a Raduino ADC. We might want a diode+cap RF probe in the corner of the board somewhere. Then we could do things like sweep that IF filter using the Si5351. What other handy tools does the Raduino make possible? What's the best way to measure inductance with a minimum of additional parts? A bit beyond what I'd try with the Raduino, but I really like K5BCQ's AQRP Vector Impedance Analyzer. ?Two Si5351 channels kept exactly 2khz apart are routed to two SA612 mixers?such that the two 2khz outputs can be sensed by two ADC's. ?One 2khz signal measures voltage, the other measures current, and the phase shift between the two is significant. ?Processed by some DSP algorithms on a uC. ?Using the Si5351's square waves, can reject harmonics since those would be?separated by more than 2khz. ?Does a very nice job of measuring an inductor, graphically showing at what frequency the capacitance between windings starts to take over. Jerry, KE7ER |
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New Group Member and pre-Raduino arduino purchaser
Don Cota
Hello from a new Member and relatively new Ham. I'm also kinda new to Yahoo Groups as well. I got into this hobby after I retired from Active Duty. I've built a couple Pixie Kits. I'm really looking forward to finishing this SSB kit. I'm not very arduino savvy yet. But I do plan on ?buying another kit or two down the road after I finish moving. Any help and good links would be appreciative. I'm also looking forward to adding an amp and a few more gadgets to it in the future. Sent from Y! Mail on my Samsung Galaxy S7 |
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Re: Yeah! No!
I received some parts in the mail tonight.? A package of (25) T37-6 toroid cores and 32AWG wire.? I wound up 45 turns on the coil, soldered it in, and it now seems to pass inspection according to the troubleshooting video, at least.? I hear noise now at C2 at at the antenna feed.? I will say that the core for L2 is actually a T30-6, not a T37-6. ? I'm not hearing anything but digital and CW on 40M tonight, but I'm not hearing any SSB on my main rig on the same antenna either.? I guess 40M is dead tonight?? Seems strange...? Guess I'll test again tomorrow. Kent W9WB On Sat, Dec 24, 2016 at 1:09 PM, Paul Chebi paul.chebi@... [BITX20] <BITX20@...> wrote:
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Joel Caulkins/N6ALT
Raj vu2zap
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