Nagaraj, This is a SSB transmitter.? SSB does not have a carrier.? You need to say aaaaahhhhh, whistle, or use an audio generator to put some sound into the mic to create the carrier. ?
Hope that helps,
Marco - KG5PRT?
On Jun 6, 2017 11:26 PM, "Nagaraj ganjigunte" < vu2gnr@...> wrote: Hello all, I am also facing the similar situation, When i modulate nearly 900ma, idling current ?150ma, but when connected to ant for testing no deflection in my SWR bridge Power indicator. Kindly suggest how to check? de? VU2GNR ?Nagaraj?
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My first thought is to double check that the black wire is soldered to the mics negative contact with the three traces to the shell. If correct, check the supplied hook up wires for continuity. Test the boards mic connector for about, I think 3 volts signal. If all that is good, then it's the mic capsule, or something worse. If it's worse, the big kids will have to help you.
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Hello all, I am also facing the similar situation, When i modulate nearly 900ma, idling current ?150ma, but when connected to ant for testing no deflection in my SWR bridge Power indicator. Kindly suggest how to check? de? VU2GNR ?Nagaraj?
On Wed, Jun 7, 2017 at 8:16 AM, <matt.benteman@...> wrote: Hello Group!
Newbie here - Just finished assembly of the bitx40 last weekend. Powered up with what appears to be good RX. I have tried to make several contacts now with no luck (I do realize that this is a QRP transceiver). I checked amp draw per the instructions. At receive, the transceiver is drawing around 150 mA. When I push the PTT, it appears to draw around 350-380 mA. However, when I speak into the mic, I don't get any additional current draw (a 1 amp jump is described in the instructions). Additionally, I tried to verify any voice transmit via a separate radio tuned to the same frequency, It appears to break squelch - but no voice is transmitted.
I am looking for some help as to the next step in troubleshooting. I don't have a dummy load or an SWR meter at this point (mine is integral to my current rig), but they are certainly not out of my reach financially if that is what is needed.
All Apologies if I've somehow missed some resource that is already present, towards resolving this issue.
Thanks in advance for the help!
Matt
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Re: Europe to States BitX QSO
Thanks Paul, I doubt that they were the first Trans Atlantic BITX/BITX QSOs But they could be, especially the SSB contact. Andy said he could have copied me if I were running 1 Watt He has some good antennas 73. Willy W1LY
On Tue, Jun 6, 2017 at 11:55 PM, KC8WBK via Groups.Io <cruisenewsnet@...> wrote: Congratulations!
Is this the first BITX40 QSO between the US and Europe?
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Do you have another microphone that you could use to test?
What is the resistance across your Mike? Does it change when you speak into it?
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Re: Europe to States BitX QSO
Congratulations!
Is this the first BITX40 QSO between the US and Europe?
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Don't give up that easily OM! Snap a pic of your rig and we can look for the issue. Do you have any test equipment? Know someone close to you who could help trouble shoot? Think how satisfying it will be when you get it fixed!
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On 6/6/2017 3:44 PM, Matt Patterson wrote: 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
Sent from my iPhone 7
On Jun 6, 2017, at 5:39 AM, Raj vu2zap <rajendrakumargg@...> wrote:
Matt,
Check the speaker first with your meter on continuity / beeper setting.
Your volume control may be the problem. Just short the brown and red wires and see with volume set at max.
Mine packed up when I tried to tin the leads!
Raj
At 06-06-2017, you wrote:
First time builder here. Got my bitx40 all together. The unit powers up but I hear no static. The instructions say I should hear a low hiss even without it connected to an antenna. I hear nothing. Anyone have an idea on where to start? Failing that, anyone want a project? I should just stick to built rigs. I have poor eyesight and suffer from headaches all the time so I'm sure it's something I did. :(
73 Matt
W5LL
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Re: uBITX - A reboot of the old BITX
Personally I'd be happy just to be able to get the PCB designs :D
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Re: Europe to States BitX QSO
Andy 9A3JH and I had a BitX40/ BitX40 QSO on CW 7.032 tonight 339/579 and then moved to SSB on 7.167 Reports were 33/44 on SSB. What thrill to work bitx to bitx over the pond. Croatia to Rhode Island 4094 miles, 6589km with QRP power. I have to thank Andy and his phased verticals for doing the heavy lifting. 73 Willy W1LY
On Tue, Jun 6, 2017 at 8:46 PM, KC8WBK via Groups.Io <cruisenewsnet@...> wrote: This could be epic.
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Re: IRF510- Temporary replacement?
Looks like the Drain and Gate are reversed, but that's easy enough to resolve. Shall I just solder it in and give it a try? Or will I need to change R136 and/or RV1? Thanks a lot. This is a learning experience for me for sure :) -- Ryan Flowers W7RLF
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?<-- Learn how to go digital on the BITX40
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Hello Group!
Newbie here - Just finished assembly of the bitx40 last weekend. Powered up with what appears to be good RX. I have tried to make several contacts now with no luck (I do realize that this is a QRP transceiver). I checked amp draw per the instructions. At receive, the transceiver is drawing around 150 mA. When I push the PTT, it appears to draw around 350-380 mA. However, when I speak into the mic, I don't get any additional current draw (a 1 amp jump is described in the instructions). Additionally, I tried to verify any voice transmit via a separate radio tuned to the same frequency, It appears to break squelch - but no voice is transmitted.
I am looking for some help as to the next step in troubleshooting. I don't have a dummy load or an SWR meter at this point (mine is integral to my current rig), but they are certainly not out of my reach financially if that is what is needed.
All Apologies if I've somehow missed some resource that is already present, towards resolving this issue.
Thanks in advance for the help!
Matt
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Re: IRF510- Temporary replacement?
Ah, I have a BS170! Would it be a drop-in replacement, then? I'll check the data sheet I suppose. Thanks for the suggestion. -- Ryan Flowers W7RLF
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?<-- Learn how to go digital on the BITX40
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Allard was compiling your version 1.113 sketch and it says "Sketch uses 30,936 bytes (100)% of program storage space. Maximum is 30,720 bytes."
Maybe this was already addressed, if so sorry. Nice job on all the extras, thanks.
David KG7WFM
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Re: Low mic gain and rf power
I also had low mic input on both bitx40 that i built.
I added a mic preamp and it made the ssb transmissions have lots of audio with good clean audio.
I just used some cheap china module. A couple of dollars.
No more yelling in the mic.
Joe
VE1BWV
On Tue, Jun 6, 2017, 10:35 PM Jerry Gaffke via Groups.Io <jgaffke= [email protected]> wrote: The microphone amp is driving a very low impedance load, won't see much voltage gain?
across the microphone amp unless you remove C106.
See this post and the thread around it: ??/g/BITX20/message/22836
On Tue, Jun 6, 2017 at 06:23 pm, Arv Evans wrote:
The electret microphone should put out around 45 mv at normal voice levels.? The microphone
amplification stage has to make up the difference between that and what the BFO mixer needs
for full output.
?
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Re: IRF510- Temporary replacement?
On the bright side, ?you can use the down time to figure out how to water cool an IFR510.?
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Re: IRF510- Temporary replacement?
On the bright side, you can use the down time to figure out how to water cool an IFR510.?
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The said capacitor cleans up the POTs viper created noise and filters any induced RF signals on the wires that go from pot to raduino.
?The cap doesn't do any tuning . All the best ?regards ?sarma ?vu3zmv
On Wed, Jun 7, 2017 at 12:45 AM, <daniel.rahn@...> wrote: Craig,
The ceramic is used with the tuning pot. See the instructions at??? Step 3: Wire up the Raduino, connect the tuning pot --> solder the 0.1uF disc ceramic between the yellow and violet wires on the tuning pot.
I'm still trying to figure out what the surface mount cap is for...please do let me know if you find out!?
-Dan
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Re: Calling West Coast BITX operators
I wonder if the folks in the Portland/Vancouver area would be interested in getting together... I've been trying to figure out how to gather together some other QRP and builder types (bitx40 or not) in this area to help each other, swap parts, talk about projects etc... if anyone is interested, let me know and we will figure out how to put something together. 73 de bill
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Re: Low mic gain and rf power
The microphone amp is driving a very low impedance load, won't see much voltage gain? across the microphone amp unless you remove C106. See this post and the thread around it: ?? /g/BITX20/message/22836
On Tue, Jun 6, 2017 at 06:23 pm, Arv Evans wrote:
The electret microphone should put out around 45 mv at normal voice levels.? The microphone
amplification stage has to make up the difference between that and what the BFO mixer needs
for full output.
?
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Gerry,
"it adds at least 10k ohms between the audio out and the speaker", where are you attempting to install the VU2ESE AGC circuit ??
Both the VU2ESE and the VK3YE AGC circuits act by shunting the audio signal around the volume control, the VU2ESE using a FET as the active shunting element and the VK3YE circuit using an LDR (driven by a LED) as the active shunting element. Neither of these circuits acts directly on the audio signal between the audio output and the speaker.
There was an informative post made in the last few months of one of our number who tried both the VU2ESE and the VK3YE AGC circuits. He found that for him the VK3YE circuit was the best/ easiest to set-up and had the most pleasing AGC action. Just search the past posts looking for AGC + VK3YE.
Best of luck,
Peter VK1XP
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On 07-06-2017 04:33, ohwenzelph via Groups.Io wrote: Hi,
Has any one built Ashhar's agc circuit and had it work? Seems it adds
at least 10k ohms between the audio out and the speaker, if I add that
much resistance I get no sound out of my speaker. Maybe I don't
understand where it is placed. Also in the photo it seems the exciter
and collector of the 2n2222 or 2n3904 are switched relative to the
schematic. Any help appreciated. I have not tried VK3YE's yet, though
it seems it would add at least 4.7k
Thanks,
Jerry AA1OF
Sent from my iPad
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Willy
bill