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Re: 300Km with a bicycle and my Bitx40
Looks like an interesting trip. ? You might want to look at an end fed half wave antenna EFHWA so you don't have to pack the fishing rod. You can find plenty of plans and kits online. ?I am using this one?
qrpguys.apps-1and1.com/end-fed-half-wave-sota-antenna-tuner |
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Re: IRF510- Temporary replacement?
Ryan? W7RLF Any of the IRF series (IRF-510, 520, 530, 540, etc) should work to some extent.? Some of them may have higher drive requirements due to higher input capacitance, but in an emergency... Other of the IRF series may also work a bit, as long as they are N-types so the polarity will be correct (IRF840 might be interesting).? You can find MOSFETs in many salvaged PC power supplies. Might even be able to parallel up 3 or 4 of 2N7000 and get 0.5 watts or so output. Arv? K7HKL _._ On Tue, Jun 6, 2017 at 7:08 PM, Ryan Flowers <geocrasher@...> wrote: Thanks Jerry. Yeah, I'll just wait it out! I have a pretty beefy heat sink on it, but I think it just can't handle WSPR's 2 minutes of full-tilt-boogie at the higher voltage. Oh well, that's what experimenting is all about. Thanks again! |
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Re: No sound
Matt W5LL Is it possibly locked in transmit mode due to wrong connection of the attachment wires? Arv K7HKL _._ On Tue, Jun 6, 2017 at 4:44 PM, Matt Patterson <W5llmatt@...> wrote: Did this and still it even a hint of sound.? Tried a different speaker too that I know works.? Frustrating.... |
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Re: IRF510- Temporary replacement?
Thanks Jerry. Yeah, I'll just wait it out! I have a pretty beefy heat sink on it, but I think it just can't handle WSPR's 2 minutes of full-tilt-boogie at the higher voltage. Oh well, that's what experimenting is all about. Thanks again!
-- Ryan Flowers W7RLF ? ?<-- Learn how to go digital on the BITX40 |
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Re: IRF510- Temporary replacement?
If desperate for something to play with while waiting for some IRF510's to arrive,
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might try removing C152, C155, C156, ?then add a 0.1uF cap from T6-5 to C160 So skipping the IRF510 entirely, driving the low-pass-filter from the 2n2219a. Might get 50mw out. ?Or might blow Q14. Probably best to sit on your hands. I bet 19v into the IRF510 continuous duty blew the IRF510 due to heat. Heat conduction from IRF510 die to tab is not ideal for this kind of service. If the IRF510 is warm to the touch, the die inside is smoking hot. A bigger heatsink might help, and/or stick with 12v for continuous duty. Or have a dozen IRF510's on hand. Jerry, KE7ER? On Tue, Jun 6, 2017 at 04:51 pm, Ryan Flowers wrote:
I blew out the IRF510 (still not completely sure how- might have been because I was doing WSPR with 19v on the PA?) and so while I source a replacement, can anyone suggest any other transistor/fet that can be used in its place? I don't care if it puts out only a 100mw, that's okay with me- I just want to be able to transmit in any capacity. I have some NPN and PNP transistors about and am wondering if one of those would be workable. Thanks :) ? |
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Quality speaker mic with minimal modding
Does anyone know of a decent quality speaker mic that does not require a lot of modification to use? ?I would like something that is a step or two up from the baofang mics. ?I want my radio to sound good and I would like my voice to come out better on the other side.
I am fine with installing a jack for the speaker mic in the enclosure. Thanks in advance. |
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Raduino_v1.14 released
I've just released raduino_v1.14, download it from
New in this version:
73, Allard PE1NWL |
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Re: Raduino error to solve
Vince Vielhaber
This part looks fine.
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Vince. On 06/06/2017 07:18 PM, Toni Cossio wrote:
Vince, --
Michigan VHF Corp. |
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Re: No sound
Matt,
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If I can be of help let me know. Be glad to do what I can up to shipping me the rig for trouble shooting. Us old farts have to stick together. I am good on QRZ. V/R Fred W4JLE -----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Matt Patterson Sent: Tuesday, June 6, 2017 18:45 To: [email protected] Subject: Re: [BITX20] No sound Did this and still it even a hint of sound. Tried a different speaker too that I know works. Frustrating.... At this point I'm going chalk it up to lesson learned. I thought this would be a fun build but it's turned into another headache that I don't need right. 73 Matt W5LL |
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Re: TFT/VFO Board from FDIM talk
#w8tee
Jack Purdum
Slowly! I found a hiccup in the State machine. Also, this release will only handle the VFO/Display for now. The CW keyer works (code practice oscillator?) and the buttons for the CW messages works. Dennis is finishing up the CW mode, AGC, and speech compression. He's still trying to find cheaper chips. I hope to have the short version ready by Thursday. Jack, W8TEE From: Art Olson <olson339@...> To: [email protected] Sent: Tuesday, June 6, 2017 7:59 PM Subject: Re: [BITX20] #W8TEE TFT/VFO Board from FDIM talk Jack how's it coming for release of code 73 Art |
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Re: Raduino error to solve
Jack Purdum
An easier way to write this would be: / ? ? Purpose: to change the increment value ? ? Argument list: ? ? ? ? int whichOne ? ? ? ?what is the current radix ? ? Return value: ? ? ? ? long ? ? ? ? ? ? ? ? ? ? ?the new increment value / long SetRadix(int whichOne) { ? long values[] = {1, 10, 100, 1000, 10000, 100000}; ? return values[whichOne]; } A short program to exercise it is here. Enter anything at the Serial monitor and press the Send button to increment the counter. long radix; void setup() { ? Serial.begin(9600); ? Serial.println("Enter radix: "); } void loop() { ? static int counter = 0; ? ?? ? if (Serial.available() > 0) { ? ? Serial.read(); ? ? counter++; ? ? if (counter > 5) { ? ? ? counter = 0L; ? ? } ? ? radix = SetRadix(counter); ? ? Serial.print("radix is now: "); ? ? Serial.println(radix); ? } } long SetRadix(int whichOne) { ? long values[] = {1, 10, 100, 1000, 10000, 100000}; ? return values[whichOne]; } Jack, W8TEE From: Toni Cossio <a.cossio@...> To: [email protected] Sent: Tuesday, June 6, 2017 7:19 PM Subject: Re: [BITX20] Raduino error to solve Vince, Many thanks, I will try with your directions. I hope this is the reason for the mistake. However the following is the final part: // Button press changes the frequency change step for 1 Hz steps
?
? if (get_button())
? {
?
? switch (radix)
? {
? ? case 1:
? ? ? radix = 10;
? ? ? break;
? ? case 10:
? ? ? radix = 100;
? ? ? break;
? ? case 100:
? ? ? radix = 1000;
? ? ? break;
? ? case 1000:
? ? ? radix = 10000;
? ? ? break;
? ? case 10000:
? ? ? radix = 100000;
? ? ? break;
? ? case 100000:
? ? ? radix = 1;
? ? ? break;
? }
? display_radix();
}
}
73 de IV3XHM, Toni |
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IRF510- Temporary replacement?
Hi all,
I blew out the IRF510 (still not completely sure how- might have been because I was doing WSPR with 19v on the PA?) and so while I source a replacement, can anyone suggest any other transistor/fet that can be used in its place? I don't care if it puts out only a 100mw, that's okay with me- I just want to be able to transmit in any capacity. I have some NPN and PNP transistors about and am wondering if one of those would be workable. Thanks :) -- Ryan Flowers W7RLF ? ?<-- Learn how to go digital on the BITX40 |
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Re: Raduino error to solve
Vince,
Many thanks, I will try with your directions. I hope this is the reason for the mistake. However the following is the final part: // Button press changes the frequency change step for 1 Hz steps
?
? if (get_button())
? {
?
? switch (radix)
? {
? ? case 1:
? ? ? radix = 10;
? ? ? break;
? ? case 10:
? ? ? radix = 100;
? ? ? break;
? ? case 100:
? ? ? radix = 1000;
? ? ? break;
? ? case 1000:
? ? ? radix = 10000;
? ? ? break;
? ? case 10000:
? ? ? radix = 100000;
? ? ? break;
? ? case 100000:
? ? ? radix = 1;
? ? ? break;
? }
? display_radix();
}
} 73 de IV3XHM, Toni |
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Re: Raduino error to solve
Vince Vielhaber
Here's with line numbers.
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1 void loop () 2 { 3 // Button press changes the frequency change step for 1 Hz steps 4 if (get_button ()) 5 { Look at line 2. Compare it to your sketch. Do you have that { there? If not, add it and try uploading again. NOTE: there is another one at line 5, I'm not talking about that one. Just the one on line 2. Vince. On 06/06/2017 06:30 PM, Toni Cossio wrote:
Vince, --
Michigan VHF Corp. |
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Re: Low mic gain and rf power
Vince Vielhaber
I thought I was having the same problem, but it turns out I wasn't. I use a Motorola Service Monitor for the dummy load and power meter and thought it was in dBm where it was actually in watts. I thought 14.1 dbm, that sucks. But it was really 14.1 watts.
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Anyway, while I was troubleshooting I was able to confirm the same RF levels (plus/minus a bit) except, of course, the output level was a lot more. Moving to the AF levels, I didn't measure past the mic. At the mic connector I'm getting around 3Vpp or more with the mic that's included in the kit. So you may want to start with the mic circuit. BTW, that 3Vpp was me just saying HELLOOOOOOOOOOOOOOO into the mic as measured on a Tektronix 2430A scope. Vince. On 06/06/2017 06:13 PM, ekelley wrote:
I have the same problem with 2 of my Bitx40's. --
Michigan VHF Corp. |
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Re: No sound
Matt Patterson
Did this and still it even a hint of sound. Tried a different speaker too that I know works. Frustrating....
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Show quoted text
At this point I'm going chalk it up to lesson learned. I thought this would be a fun build but it's turned into another headache that I don't need right. 73 Matt W5LL Sent from my iPhone 7 On Jun 6, 2017, at 5:39 AM, Raj vu2zap <rajendrakumargg@...> wrote: |
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Re: Raduino error to solve
richard kappler
Nope, my mistake, need to stop reading code with the flu, parents are fine, curly braces are not. On Jun 6, 2017 6:34 PM, "richard kappler" <richkappler@...> wrote:
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Allard PE1NWL
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