I have tried different electrets, and one rated at - 44. They are all similar. However the stock element provides more output, I would say around 1-2db more looking at the output power speaking normally. The stock can't be a - 60db .
Il 25/ott/2018 18:11, "Michael Shreeve" < shreevester@...> ha scritto: Also, the on small 30-44 db microphones have arrived and there much smaller than the ones Ashhar supplies, I'd safe half the diameter.?
|
Also, the on small 30-44 db microphones have arrived and there much smaller than the ones Ashhar supplies, I'd safe half the diameter.?
|
If you look at gain charts, say at Digikey for instance, you will see that -24 db is a very high gain electret element, much higher than most. The average typical element is around -40 db,? the most sensitive is -24db and there are three (by using the term "electret" as the only search term) . It would be nice to know the actual sensitivity and or part number, or have a spec sheet on the original used by Ashhar. I put the question to him, he said he would talk to "his guy" and hasn't gotten back. Bulk from China, that's all we know. One fellow said "-60db" and that would be one of the least sensitive out there. Not sure how he determined that.? No correlation in price, so, perhaps actual flatness and distortion values make a difference. Also, knowing Ashhar does try to purchase inexpensive parts, and pennies make a difference when your selling 10 to 100 k of units, the least expensive , at least at Digikey, were -44 db units. 70 cents. The most expensive, and I'm not including ones without a photo because I can't tell if they are the same physical design, is around $4 for one, and -35dbm . Noise figures vary a lot.? I'm assuming the lowest numbers are the best but do not know. The chart is here .?
I have purchased some "deals" from ebay, and I'll be trying to determine how well they work. One so far, -52db, another,?30-44dB Electret Condenser Microphone High Sensitivity Pickup .?
Haven't tried either yet. Thinking a switched system would be smart for immediate comparisons. Also have the better compression module, and other things. Have had such a powerful signal on 80m that I just haven't felt a high priority need to mess with this. Antennas really make a difference.?
|
Re: RX trouble Low / BAD Boards?
Good point Jim.? It is rated within 3db at 35 MHz.?? Didn't expect an accurate reading at 45, but did expect to see something.? Will double check with my RF voltmeter...
Woody? -? KZ4AK
toggle quoted message
Show quoted text
On 10/25/2018 5:07, jim via Groups.Io wrote: Maybe a dumb question but its gotta be asked ...how fast is your scope?
Clk 0 is 12 Mhz or so
Clk 1 is 45 +/- 12 Mhz (33/57 Mhz)
Clk 2 is 45 Mhz to 75 Mhz
TP1 is directly off the antenna (think microvolts)
Jim
|
Re: RX trouble Low / BAD Boards?
Yes, have the v4 with discrete transistor amp.? Will check out the amp info.? Audio was so low at the vol wiper that hardly anything audible when tapped the off board amp from it as an experiment. OTOH, the bigger problem is no (or VERY) low level on CLK 1 & CLK2 from the Raduino.? So low I am surprised it received anything. Woody,? KZ4AK On 10/25/2018 0:56, Skip Davis via Groups.Io wrote: Woody do you have the version 4 board with the discreet audio amp? If so checkout the archives or Wiki page for a fix/mod for the amplifier. There were some builders that had distorted audio output and to me your recordings sound like that audio distortion. If you can inject a carrier input compare your audio signals at the high side of the volume control and then your output. You can also look at the collector of Q71 which should be the same as the volume control only a larger level.
If you have the IC amplifier then the chip maybe bad.
Skip Davis, NC9O
--
|
Re: RX trouble Low / BAD Boards?
Woody does this board transmit OK ?
Try both SSB and CW.
Raj
At 25-10-18, you wrote:
toggle quoted message
Show quoted text
Will give that a try, but
suspect it is not the source of the problem.?? The speaker out feeds
the top of a 500 ohm potentiometer.?? Adjusting the drive level to
the off board amp with the pot?? (wiper) affects volume available,
but doesn't affect the audio quality.
Attached, FWIW, are two mp3 clips.??
"compare 2 noise" is with the antenna attached, but no signal.
First is the ubitx, followed by the K2. Note: I do have a bit of power
line noise.??
"compare 2" is of a 40M QSO.?? Ubitx first, then the K2.
--------------
Tried the off board amp, tapping into earlier audio stages.?? Input
level so low, could not hear the output
-----------------
Still scratching my head!? ?? Compared the ubitx to my Elecraft K2
by switching the antenna to each on a S5 (on K2) signal.?? The RF
sensitivity is not as good as the K2 and (still) shows some
distortion.
WELL, WELL,
WELL...
Pulled out the o'scope and made some measurements.?? I think I have
a bad ubitx.?? I can only get a measurable signal from CLK 0 - TP18
reads 1.3 v PP.? ?? TP15 (CLK 1) and TP12 (CLK 2) are below what I
can measure with a 5mv scale with 10x probe.?? It is a wonder I hear
anything!!!?? Also may explain the super low audio when I do hear
something.?? Probably why the BFO adjustment is really weird
too.
Here is a list of the TPs I have checked (no antenna):
TP 1?? -?? Zero (zero = below readability)
TP 12 -?? Zero?? (CLK 2) No signal either side of R100
either.
TP 14 -?? Zero
TP 15 - Zero?? No signal either side of of R106 either.
TP 18 - (CLK 0)?? 1.3 v PP
Note that "Zero" may have some signal, but below my scope's
measurement capability.
Measured the Raduino directly where it plugs into the main board.
Confirms what I saw above.?? Pin 19 (CLK 0), lots of signal.??
Pin 16 (CLK 1), no signal.?? Pin 13 (CLK 2) no signal.
Looks like I need to contact HFsignals.
Woody, KZ4AK
|
I have this done now and it appears to be "all good". But I did it by tweaking until I got it right on. Gordon's advice about using a viewer was good, and I did use the WSJT X software viewer.
This must be about the worst method of aligning a Tx/Rx I have ever seen. Perhaps it wouldn't be so bad if there was some instruction sent with the rig from the factory. It appears there are several methods that might or might not work.?
My next task is to make it CAT capable....
The old TS120S now has a new lease on life. Despite all the talk of the Tranmission being dirty I have not yet see any sign of that practically. I think this is because I use a very low drive level by changing RV 1 to a 50 Kohm pot and limiting output to 100 watts. The TS 120 amplifier has inbuilt filtering too.?
Thanks for your interest.
73 Roger ZL2RX ?
|
Re: RX trouble Low / BAD Boards?
Maybe a dumb question but its gotta be asked ...how fast is your scope? Clk 0 is 12 Mhz or so Clk 1 is 45 +/- 12 Mhz (33/57 Mhz) Clk 2 is 45 Mhz to 75 Mhz
TP1 is directly off the antenna (think microvolts)
Jim
On Wednesday, October 24, 2018, 6:00:58 PM PDT, Skip Davis via Groups.Io <skipnc9o@...> wrote:
Woody do you have the version 4 board with the discreet audio amp? If so checkout the archives or Wiki page for a fix/mod for the amplifier. There were some builders that had distorted audio output and to me your recordings sound like that audio distortion. If you can inject a carrier input compare your audio signals at the high side of the volume control and then your output. You can also look at the collector of Q71 which should be the same as the volume control only a larger level.? If you have the IC amplifier then the chip maybe bad.? On Oct 24, 2018, at 16:51, Woody < mailme@...> wrote:
Will give that a try, but suspect it is
not the source of the problem.? The speaker out feeds the top of a
500 ohm potentiometer.? Adjusting the drive level to the off board
amp with the pot? (wiper) affects volume available, but doesn't
affect the audio quality.
Attached, FWIW, are two mp3 clips.? "compare 2 noise" is with the
antenna attached, but no signal. First is the ubitx, followed by
the K2. Note: I do have a bit of power line noise.?
"compare 2" is of a 40M QSO.? Ubitx first, then the K2.
--------------
Tried the off board amp, tapping into earlier audio stages.? Input
level so low, could not hear the output
-----------------
Still scratching my head!?? Compared the ubitx to my Elecraft K2
by switching the antenna to each on a S5 (on K2) signal.? The RF
sensitivity is not as good as the K2 and (still) shows some
distortion.
WELL, WELL, WELL...
Pulled out the o'scope and made some measurements.? I think I have
a bad ubitx.? I can only get a measurable signal from CLK 0 - TP18
reads 1.3 v PP.?? TP15 (CLK 1) and TP12 (CLK 2) are below what I
can measure with a 5mv scale with 10x probe.? It is a wonder I
hear anything!!!? Also may explain the super low audio when I do
hear something.? Probably why the BFO adjustment is really weird
too.
Here is a list of the TPs I have checked (no antenna):
TP 1? -? Zero (zero = below readability)
TP 12 -? Zero? (CLK 2) No signal either side of R100 either.
TP 14 -? Zero
TP 15 - Zero? No signal either side of of R106 either.
TP 18 - (CLK 0)? 1.3 v PP
Note that "Zero" may have some signal, but below my scope's
measurement capability.
Measured the Raduino directly where it plugs into the main board.
Confirms what I saw above.? Pin 19 (CLK 0), lots of signal.? Pin
16 (CLK 1), no signal.? Pin 13 (CLK 2) no signal.
Looks like I need to contact HFsignals.
Woody, KZ4AK
On 10/24/2018 16:27, Richie Chambless wrote:
Woody?
I just listened to your sound clips and I heard distortion that¡¯s
usually produced when a source signal overdrives the next stage.
Where are you connecting your outboard amp? I would think that you
would get distortion if you connected it to the speaker out (8 ohm
impedance). I would tap the audio at the volume pot (top lug) if
you haven¡¯t already.?
<compare 2 noise.mp3>
<compare 2.mp3>
|
Re: Harmonics and Relay Replacement
The before relay pic has slightly degraded performance due to the relays
being mounted on
sockets. This add a few mm extra length to the leads to the contact and
increases coupling!
The second is Axicom soldered directly on PCB.
With Axicom my boards are perfect on 40 and 80.
Raj
At 24-10-18, you wrote:
toggle quoted message
Show quoted text
That's pretty impressive,
Raj.
Jack, W8TEE
On Wednesday, October 24, 2018, 1:06:11 AM EDT, Raj vu2zap
<rajendrakumargg@...> wrote:
Jim,
I did? not get much improvement with Axicom in a socket.. soldering
directly to board made a big difference.
The harmonic rejection on lower bands was amazing!
On one board only 20M is a bit off.
Raj
Example: the first is stock and 2nd is Axicom. The second needs to be
referenced to -1db to compare to
first!
?
?
At 23-10-18, you wrote:
No, I just used the
relays.? I was looking for the simplest approach.? I have
several other projects that were on hold, giving me time to try the relay
swap Mike Doty originally discovered with limited but encouraging
results.?
I've done all I plan on doing regarding the harmonic reduction.? I
shared what I found with the group, got unjustly accused of being a
"phoney" and I now wash my hands of this part of the
project.
Back to improving the available firmware, displays and controller
hardware.?
Jim
|
Re: VK4PP uBitx LPF BANK add-on Board
Hi Nick
Happy to test for you, no need to send any parts etc for me.
glenn
vk3pe
|
Re: RX trouble Low / BAD Boards?
Woody do you have the version 4 board with the discreet audio amp? If so checkout the archives or Wiki page for a fix/mod for the amplifier. There were some builders that had distorted audio output and to me your recordings sound like that audio distortion. If you can inject a carrier input compare your audio signals at the high side of the volume control and then your output. You can also look at the collector of Q71 which should be the same as the volume control only a larger level.? If you have the IC amplifier then the chip maybe bad.?
toggle quoted message
Show quoted text
On Oct 24, 2018, at 16:51, Woody < mailme@...> wrote:
Will give that a try, but suspect it is
not the source of the problem.? The speaker out feeds the top of a
500 ohm potentiometer.? Adjusting the drive level to the off board
amp with the pot? (wiper) affects volume available, but doesn't
affect the audio quality.
Attached, FWIW, are two mp3 clips.? "compare 2 noise" is with the
antenna attached, but no signal. First is the ubitx, followed by
the K2. Note: I do have a bit of power line noise.?
"compare 2" is of a 40M QSO.? Ubitx first, then the K2.
--------------
Tried the off board amp, tapping into earlier audio stages.? Input
level so low, could not hear the output
-----------------
Still scratching my head!?? Compared the ubitx to my Elecraft K2
by switching the antenna to each on a S5 (on K2) signal.? The RF
sensitivity is not as good as the K2 and (still) shows some
distortion.
WELL, WELL, WELL...
Pulled out the o'scope and made some measurements.? I think I have
a bad ubitx.? I can only get a measurable signal from CLK 0 - TP18
reads 1.3 v PP.?? TP15 (CLK 1) and TP12 (CLK 2) are below what I
can measure with a 5mv scale with 10x probe.? It is a wonder I
hear anything!!!? Also may explain the super low audio when I do
hear something.? Probably why the BFO adjustment is really weird
too.
Here is a list of the TPs I have checked (no antenna):
TP 1? -? Zero (zero = below readability)
TP 12 -? Zero? (CLK 2) No signal either side of R100 either.
TP 14 -? Zero
TP 15 - Zero? No signal either side of of R106 either.
TP 18 - (CLK 0)? 1.3 v PP
Note that "Zero" may have some signal, but below my scope's
measurement capability.
Measured the Raduino directly where it plugs into the main board.
Confirms what I saw above.? Pin 19 (CLK 0), lots of signal.? Pin
16 (CLK 1), no signal.? Pin 13 (CLK 2) no signal.
Looks like I need to contact HFsignals.
Woody, KZ4AK
On 10/24/2018 16:27, Richie Chambless wrote:
Woody?
I just listened to your sound clips and I heard distortion that¡¯s
usually produced when a source signal overdrives the next stage.
Where are you connecting your outboard amp? I would think that you
would get distortion if you connected it to the speaker out (8 ohm
impedance). I would tap the audio at the volume pot (top lug) if
you haven¡¯t already.?
<compare 2 noise.mp3>
<compare 2.mp3>
|
Re: VK4PP uBitx LPF BANK add-on Board
Thanks Glenn,
Will do, ill try get it done this weekend... Do you want a few for yourself?
Many Thanks.
|
Re: VK4PP uBitx LPF BANK add-on Board
Nick, I have been away on a holiday......
If you would like to send just the assembled new LPF board to me< i will check it over for you with SA etc.
Glenn
vk3pe
|
Oh okay, sorry for the typos. But I guess I didn¡¯t understand you. Set the bias so the current is less then 12mA, got it. Not find a part that don¡¯t exceed 20mA which is what I thought you meant in your notes. I didn¡¯t understand that.?
Thanks
toggle quoted message
Show quoted text
On Oct 24, 2018, at 3:17 PM, ajparent1/KB1GMX < kb1gmx@...> wrote: Joe, Yes, a cap C81.
? please you please clarify and if that is the spec for the BFR106 will that part in the data sheet work. The only thing I see about current in the ma is.?
Collector current IC 210 mA Base current IB 21ma
What are you saying...??? Are you asking based on some _mumble_ the part is wrong?
? Set the bias so that the current is less than 12mA.? ?You can measure that current at the emitter by measuring the
voltage across the resistor R82.? The resistor to change is R81.
Allison
|
Re: RX trouble Low / BAD Boards?
Will give that a try, but suspect it is
not the source of the problem.? The speaker out feeds the top of a
500 ohm potentiometer.? Adjusting the drive level to the off board
amp with the pot? (wiper) affects volume available, but doesn't
affect the audio quality.
Attached, FWIW, are two mp3 clips.? "compare 2 noise" is with the
antenna attached, but no signal. First is the ubitx, followed by
the K2. Note: I do have a bit of power line noise.?
"compare 2" is of a 40M QSO.? Ubitx first, then the K2.
--------------
Tried the off board amp, tapping into earlier audio stages.? Input
level so low, could not hear the output
-----------------
Still scratching my head!?? Compared the ubitx to my Elecraft K2
by switching the antenna to each on a S5 (on K2) signal.? The RF
sensitivity is not as good as the K2 and (still) shows some
distortion.
WELL, WELL, WELL...
Pulled out the o'scope and made some measurements.? I think I have
a bad ubitx.? I can only get a measurable signal from CLK 0 - TP18
reads 1.3 v PP.?? TP15 (CLK 1) and TP12 (CLK 2) are below what I
can measure with a 5mv scale with 10x probe.? It is a wonder I
hear anything!!!? Also may explain the super low audio when I do
hear something.? Probably why the BFO adjustment is really weird
too.
Here is a list of the TPs I have checked (no antenna):
TP 1? -? Zero (zero = below readability)
TP 12 -? Zero? (CLK 2) No signal either side of R100 either.
TP 14 -? Zero
TP 15 - Zero? No signal either side of of R106 either.
TP 18 - (CLK 0)? 1.3 v PP
Note that "Zero" may have some signal, but below my scope's
measurement capability.
Measured the Raduino directly where it plugs into the main board.
Confirms what I saw above.? Pin 19 (CLK 0), lots of signal.? Pin
16 (CLK 1), no signal.? Pin 13 (CLK 2) no signal.
Looks like I need to contact HFsignals.
Woody, KZ4AK
On 10/24/2018 16:27, Richie Chambless wrote:
Woody?
I just listened to your sound clips and I heard distortion that¡¯s
usually produced when a source signal overdrives the next stage.
Where are you connecting your outboard amp? I would think that you
would get distortion if you connected it to the speaker out (8 ohm
impedance). I would tap the audio at the volume pot (top lug) if
you haven¡¯t already.?
_._,_._,_
--?
|
Thanks for ?your reply Gordon I have not upgraded my software (ver 4.3) yet. The instruction I received originally for changing values for calibration and BFO were some how out of date. They would not work with my software.?
The procedure for saving changes appears to me to very often not work. After making changes I exit SeTTINGS then exit MENU then switch off the rig and wait ten secs. Sometimes it works sometimes not....... 73
On Thu, 25 Oct 2018 at 08:14, Gordon Gibby < ggibby@...> wrote:
I just rewrite the software to put in numbers that work
On Oct 24, 2018, at 14:53, roger wincer < zedl2rx@...> wrote:
Thanks Gordon...
I have been working on this for about 5 weeks.My project was to replace the Tx and Rx of an old Kenwood TS120S with the uBitx. This I have done and have improved the receiver by adding audio filters. It now runs 100watts and I am quite pleased
with it
But this calibration thing has got the better of me. I have read so many conflicting instructions abt how to do it. I notice last night that my BFO changes are not being saved! This kind of event drives me nuts.
How do you save your changes?
73
Roger
On Thu, 25 Oct 2018 12:28 am Gordon Gibby < ggibby@...> wrote:
I may have put on GitHub ?the little software to upload to the uBitx ?to get it to go to a certain freq.? The idea was to get it to go to the frequency of the Crystal itself: so phase locked loop was 1 to 1
Then whatever frequency you measured tells you how far off the crystal is , mine were about 3 kHz off; if you¡¯ve already adjusted your frequencies correctly you may not need this
Then just use a waterfall looking at White Noise to set the BFo frequency to get the right audio pass band. If you change it but too much there¡¯s a chance you¡¯ll flip sidebands, ?but I bet most people won¡¯t. ?
On Oct 24, 2018, at 03:28, roger wincer < zedl2rx@...> wrote:
Thanks Gordon...much appreciated.
?
73
Roger
?
Sent from for Windows 10
?
?
It¡¯s been a while, but I think I calibrated the main oscillator by commanding it to 10 MHz and then measuring the frequency with a small piece of wire near it going into an Icom 718.? Then put the proper constant into the software.?
From there, use any digital software that lets you see the power across the ?audio spectrum and adjust while listening to galactic White Noise, so it is in the proper audio passband. ? If my memory is correct, my passbands were a bit narrow.
? You could use free FLDIGI or probably any of a zillion other products.
?
On Oct 24, 2018, at 01:28, roger wincer <zedl2rx@...> wrote:
In the history of the uBitx has anyone ever calibrated the readout and set the BFO correctly. If so please advise how it was done and saved. I am begining to think its impossible.
<18392439DBD74B66BC7BFF85F28C66E3.png>
<EAA5FB27B49C413D89A3C6F2675EFD32.png>
|
555 timer to sweep the BFO crystal up and down while observing filter output on
a dual-channel analog oscilloscope.? 555 sweep recovery provided sync for the
scope.?
_._
So ...20 or so years ago I decided to build a xtal filter for the "ZOI" spect-an ...First built a "wobbulator" with one of the crystal stash ..(had to add series inductance to the crystal to get it to tune lower ...Ramp generator to sweep it ...tested the xtals for "nearly matching" frequency (Fs/Fp) ..Variable caps to "tune" it ...Time or money ...choices
Jim
On Wednesday, October 24, 2018, 8:55:38 AM PDT, Wayne Leake < wayneleake@...> wrote:
?I have been thinking about building an 8 Xtal version of the filter myself.
many of us have limited test gear, so have to make do with what we have or can cobble up. ?YMMV ?Wayne WA2YNE ?Imperial TX.
|
Joe, Yes, a cap C81.
? please you please clarify and if that is the spec for the BFR106 will that part in the data sheet work. The only thing I see about current in the ma is.?
Collector current IC 210 mA Base current IB 21ma
What are you saying...??? Are you asking based on some _mumble_ the part is wrong?
? Set the bias so that the current is less than 12mA.? ?You can measure that current at the emitter by measuring the
voltage across the resistor R82.? The resistor to change is R81.
Allison
|
I just rewrite the software to put in numbers that work
On Oct 24, 2018, at 14:53, roger wincer < zedl2rx@...> wrote:
toggle quoted message
Show quoted text
Thanks Gordon...
I have been working on this for about 5 weeks.My project was to replace the Tx and Rx of an old Kenwood TS120S with the uBitx. This I have done and have improved the receiver by adding audio filters. It now runs 100watts and I am quite pleased
with it
But this calibration thing has got the better of me. I have read so many conflicting instructions abt how to do it. I notice last night that my BFO changes are not being saved! This kind of event drives me nuts.
How do you save your changes?
73
Roger
On Thu, 25 Oct 2018 12:28 am Gordon Gibby < ggibby@...> wrote:
I may have put on GitHub ?the little software to upload to the uBitx ?to get it to go to a certain freq.? The idea was to get it to go to the frequency of the Crystal itself: so phase locked loop was 1 to 1
Then whatever frequency you measured tells you how far off the crystal is , mine were about 3 kHz off; if you¡¯ve already adjusted your frequencies correctly you may not need this
Then just use a waterfall looking at White Noise to set the BFo frequency to get the right audio pass band. If you change it but too much there¡¯s a chance you¡¯ll flip sidebands, ?but I bet most people won¡¯t. ?
On Oct 24, 2018, at 03:28, roger wincer < zedl2rx@...> wrote:
Thanks Gordon...much appreciated.
?
73
Roger
?
Sent from for Windows 10
?
?
It¡¯s been a while, but I think I calibrated the main oscillator by commanding it to 10 MHz and then measuring the frequency with a small piece of wire near it going into an Icom 718.? Then put the proper constant into the software.?
From there, use any digital software that lets you see the power across the ?audio spectrum and adjust while listening to galactic White Noise, so it is in the proper audio passband. ? If my memory is correct, my passbands were a bit narrow.
? You could use free FLDIGI or probably any of a zillion other products.
?
On Oct 24, 2018, at 01:28, roger wincer <zedl2rx@...> wrote:
In the history of the uBitx has anyone ever calibrated the readout and set the BFO correctly. If so please advise how it was done and saved. I am begining to think its impossible.
<18392439DBD74B66BC7BFF85F28C66E3.png>
<EAA5FB27B49C413D89A3C6F2675EFD32.png>
|
Thanks Gordon... I have been working on this for about 5 weeks.My project was to replace the Tx and Rx of an old Kenwood TS120S with the uBitx. This I have done and have improved the receiver by adding audio filters. It now runs 100watts and I am quite pleased with it But this calibration thing has got the better of me. I have read so many conflicting instructions abt how to do it. I notice last night that my BFO changes are not being saved! This kind of event drives me nuts. How do you save your changes? 73 Roger
On Thu, 25 Oct 2018 12:28 am Gordon Gibby < ggibby@...> wrote:
I may have put on GitHub ?the little software to upload to the uBitx ?to get it to go to a certain freq.? The idea was to get it to go to the frequency of the Crystal itself: so phase locked loop was 1 to 1
Then whatever frequency you measured tells you how far off the crystal is , mine were about 3 kHz off; if you¡¯ve already adjusted your frequencies correctly you may not need this
Then just use a waterfall looking at White Noise to set the BFo frequency to get the right audio pass band. If you change it but too much there¡¯s a chance you¡¯ll flip sidebands, ?but I bet most people won¡¯t. ?
On Oct 24, 2018, at 03:28, roger wincer < zedl2rx@...> wrote:
Thanks Gordon...much appreciated.
?
73
Roger
?
Sent from for Windows 10
?
?
It¡¯s been a while, but I think I calibrated the main oscillator by commanding it to 10 MHz and then measuring the frequency with a small piece of wire near it going into an Icom 718.? Then put the proper constant into the software.?
From there, use any digital software that lets you see the power across the ?audio spectrum and adjust while listening to galactic White Noise, so it is in the proper audio passband. ? If my memory is correct, my passbands were a bit narrow.
? You could use free FLDIGI or probably any of a zillion other products.
?
On Oct 24, 2018, at 01:28, roger wincer <zedl2rx@...> wrote:
In the history of the uBitx has anyone ever calibrated the readout and set the BFO correctly. If so please advise how it was done and saved. I am begining to think its impossible.
<18392439DBD74B66BC7BFF85F28C66E3.png>
<EAA5FB27B49C413D89A3C6F2675EFD32.png>
|
Michael Shreeve
Raj vu2zap
Skip Davis
Nick VK4PP