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Re: No output power on
#v3
Hi Evan,
The comment was not directed at you but as information for the poster of the statement.? I don't think that I can a recall a single instance where a pop and smoke left my equipment working. -- 73 Dave |
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The signal off the volume control can be used as a signal source for either S-meter purposes OR a way to control an AGC circuit by causing attenuation for signals above a pre-set level. However, I learned with my G90 that there are times when the AGC should be shut off to provide maximum signal gain. Bob ¡ª KK5R
On Wednesday, October 28, 2020, 12:56:25 PM EDT, Jack, W8TEE via groups.io <jjpurdum@...> wrote:
Again, I'm not an EE type, but if the metering is done off the volume control, is it really an SWR meter or a VU meter?? Jack, W8TEE
On Wednesday, October 28, 2020, 12:49:45 PM EDT, Bob Lunsford via groups.io <nocrud222@...> wrote:
This again is offered to show an S-meter circuit borrowed from the transceiver circuit being sold from Indonesia. It is apparently attachable to the volume control and since it's in the receive system, it does not affect the transmit system. It can be "rubbered" here and there since the component values may be the best for this considering that they are what is available to the builders in Indonesia, the FET and transistor can work equally well when using substitutes. Attaching to the high end of the uBITX's volume control and making the 47K variable in the circuit below a set resistor for calibration purposes results in making this a usable circuit. The meter, of course, can be substituted with an LED barcode circuit OR merely provide a source signal for an on-screen display of received signal level. The circuit as shown is relatively simple, however. Bob ¡ª KKR
On Wednesday, October 28, 2020, 7:06:58 AM EDT, IW4AJR Loris <lorisbollina@...> wrote:
On the CCARC (Carroll County Amateur Radio Club, Inc.) website I found a very interesting article on automatic gain control that is worth reading!
Without many frills Carol makes us understand that an AGC (automatic gain control) on the IF of the uBITX, due to the nature of the amps used (bidirectional), is very complex to make at this level of the circuit ...
therefore ? ...
Much better and less invasive to act directly on the volume control, implementing a simple but effective automatic volume control (AVC)!
Think man ... think ...
A little less software and a little more electronic experimentation and, with much less effort, very complex problems can be solved!
Think man ... think !
Greetings to all, Loris IW4AJR
-- Jack, W8TEE |
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Re: No output power on
#v3
Considering that the radio's boards are pretested and aligned, causing smoke and pops would have to be an accident or intentional. I got my new V6 yesterday at the Post Office (DHL sent the radio from the Cincinnati hub by USPS to my Post Offic) and within an hour of opening the box, it was a working radio on my bench. No Problem. No smoke, no pops. Nor did I expect anything like this when turning on the power. It's a simple plug-n-chug operation to assemble ... as long as the assembler uses a metric scale to make sure to use the proper (short) screws to mount the complete case. I assembled nearly all the ham radio Heath kits and only had one diode with the cathode band on the wrong end and a screw with no threads. With uBITX, I don't even expect to find this. Bob ¡ª KK5R
On Wednesday, October 28, 2020, 9:57:19 AM EDT, _Dave_ AD0B <davesters@...> wrote:
Pops and smoking are a normal part of uBITX startups.. NOT!!!!!!!!! -- 73 Dave |
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Re: Simple UBITX Test Set
When playing my new V6 on a local AM broadcast station and listening to the same station on my main radio, there is a way to know when the two signals are on the same frequency because you can hear the frequency difference between the two audio signals. It is a signal that can be nulled and if both are in the USB or LSB mode, you can read the signal discrepancy frequency by tuning the main radio up or down from the zero beat signal and reading the frequencies on the main rig's display. Then you have to wonder if the main rig's dial is off frequency OR if the broadcast station is not squarely on frequency. Doing this with other stations will give some confidence in the broadcast station's frequency accuracy since they are beholden to the FCC to be on the correct frequency. This may open up a nest of snakes when dealing with some podunk station, however, but the chance of it being inaccurate is slim. Something to play with, anyway. Bob ¡ª KK5R
On Wednesday, October 28, 2020, 7:54:34 AM EDT, Vic WA4THR via groups.io <vhklein@...> wrote:
Regarding trying to calibrate with WWV, it actually is easier if you have a second AM receiver when WWV is sending tones. You can then match the tone frequency between the uBitX and the AM receiver much easier than when zero beating as you can do that within a few cycles as opposed to losing the low frequency notes perhaps 100's of cycles before zero beat. Note, to be accurate the 2nd receiver needs to be AM, which eliminates that receiver's error which could be added to the perceived tone frequency if using SSB. That is the technique I used on mine and it is dead on frequency. =Vic= |
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Jack, W8TEE
Again, I'm not an EE type, but if the metering is done off the volume control, is it really an SWR meter or a VU meter?? Jack, W8TEE
On Wednesday, October 28, 2020, 12:49:45 PM EDT, Bob Lunsford via groups.io <nocrud222@...> wrote:
This again is offered to show an S-meter circuit borrowed from the transceiver circuit being sold from Indonesia. It is apparently attachable to the volume control and since it's in the receive system, it does not affect the transmit system. It can be "rubbered" here and there since the component values may be the best for this considering that they are what is available to the builders in Indonesia, the FET and transistor can work equally well when using substitutes. Attaching to the high end of the uBITX's volume control and making the 47K variable in the circuit below a set resistor for calibration purposes results in making this a usable circuit. The meter, of course, can be substituted with an LED barcode circuit OR merely provide a source signal for an on-screen display of received signal level. The circuit as shown is relatively simple, however. Bob ¡ª KKR
On Wednesday, October 28, 2020, 7:06:58 AM EDT, IW4AJR Loris <lorisbollina@...> wrote:
On the CCARC (Carroll County Amateur Radio Club, Inc.) website I found a very interesting article on automatic gain control that is worth reading!
Without many frills Carol makes us understand that an AGC (automatic gain control) on the IF of the uBITX, due to the nature of the amps used (bidirectional), is very complex to make at this level of the circuit ...
therefore ? ...
Much better and less invasive to act directly on the volume control, implementing a simple but effective automatic volume control (AVC)!
Think man ... think ...
A little less software and a little more electronic experimentation and, with much less effort, very complex problems can be solved!
Think man ... think !
Greetings to all, Loris IW4AJR
-- Jack, W8TEE |
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This again is offered to show an S-meter circuit borrowed from the transceiver circuit being sold from Indonesia. It is apparently attachable to the volume control and since it's in the receive system, it does not affect the transmit system. It can be "rubbered" here and there since the component values may be the best for this considering that they are what is available to the builders in Indonesia, the FET and transistor can work equally well when using substitutes. Attaching to the high end of the uBITX's volume control and making the 47K variable in the circuit below a set resistor for calibration purposes results in making this a usable circuit. The meter, of course, can be substituted with an LED barcode circuit OR merely provide a source signal for an on-screen display of received signal level. The circuit as shown is relatively simple, however. Bob ¡ª KKR
On Wednesday, October 28, 2020, 7:06:58 AM EDT, IW4AJR Loris <lorisbollina@...> wrote:
On the CCARC (Carroll County Amateur Radio Club, Inc.) website I found a very interesting article on automatic gain control that is worth reading!
Without many frills Carol makes us understand that an AGC (automatic gain control) on the IF of the uBITX, due to the nature of the amps used (bidirectional), is very complex to make at this level of the circuit ...
therefore ? ...
Much better and less invasive to act directly on the volume control, implementing a simple but effective automatic volume control (AVC)!
Think man ... think ...
A little less software and a little more electronic experimentation and, with much less effort, very complex problems can be solved!
Think man ... think !
Greetings to all, Loris IW4AJR
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Re: Simple UBITX Test Set
If?
Ashhar Farhan can calibrate?the UBITX by the PC via web, what?about a web app to decode SSTV? It can be done with laptop?and easypal?for example listening to the hand held, but it will be great a?web page with a chat, then the images there, and not using easypal. I also know there are pages to load the images, but I am talking web app instead of easypal. That would be great. On Wed, Oct 28, 2020 at 3:28 AM Tom, wb6b <wb6b@...> wrote: On Tue, Oct 27, 2020 at 09:55 AM, Evan Hand wrote: |
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A strange thing about calibration!!
Hello,
I don¡¯t know if anyone has ever put an oscilloscope on the BF part of the audio amplifier.?Example connect to hp output with sufficient level. I notice that the calibragre gives a pure signal of sound (a little noise in fact). No oscillation. Not to mention setting the BFO, and after validating your calibration, you need to reinitialize your Ubitx. And this is where it becomes fun, you find your sound (Everything seems normal to you), but each time, it is in fact modulated (Like from the AM) in 16.6 Khtz. You can¡¯t hear it. This frequency), because your ears can¡¯t hear that frequency. And if you are a little old, these are more than 20 years old ears!! LOL You can resume your calibration in all directions, it is always the same result. I can¡¯t explain the reason for this phenomenon. There may be a parameter to change? It¡¯s not a nuisance for listening, but there has to be an answer. If some one may test also to see if i have this ? cdt |
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Re: No output power on
#v3
Pops and smoking are a normal part of uBITX startups..
NOT!!!!!!!!! -- 73 Dave |
_Dave_ AD0B
Bob Lunsford
K2ICC
Gerard
