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Re: uBITx For Sale
#ubitx
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On 2018-03-11 14:46, Marty Squicciarini wrote:
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Re: #uBITX Firmware KD8CEC - IF-Shift etc.
#ubitx
Well, that was another thing that got pruned out the original document
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before posting as 44182. All that 44182 has to say is: ??When adjusting the BFO, we should move the VFO to get us back to the displayed frequency. Doesn't say anything about what the original uBitx code does. ? Sorry for any confusion. Jerry On Sun, Mar 11, 2018 at 09:40 am, Jerry Gaffke wrote:
As I stated in post 44182, the original uBitx code only moves the BFO when doing a BFO Adjust, |
Re: Complaint Department
Very good advice On Sun, Mar 11, 2018 at 6:58 PM, ekelley <ekelley828@...> wrote: Guys & Gals, |
Re: #uBITX Firmware KD8CEC - IF-Shift etc.
#ubitx
One more complication,
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Post 44182 puts clk1 at 57995000 for USB and 32997000 for LSB. They can both be adjusted up and down by some equal number of hz? to compensate for differences in where the center of the 45mhz passband is. But this all assumes that the center of the sideband of interest is 1500 hz from the carrier.?? We may need to move the USB and LSB values for clk1 independently when the PBT function changes that figure of 1500 hz by a few hundred Hz. But the effect of a few hundred Hz should be far less noticeable than the current difference of around 4khz.? Good thing the math here is all just addition and subtraction,? nothing complicated.? ;-) Jerry, KE7ER On Sun, Mar 11, 2018 at 12:16 pm, Jerry Gaffke wrote: Yes, the passband of the 12mhz filter can vary by rig. |
Re: [uBiTx] last frequency memory?
¿ªÔÆÌåÓýUpgrade to the KD8CEC firmware
(requires no hardware mods) as this remembers your last tuned
frequency ...
M On 12/03/18 1:36 AM, sulu82@... wrote: I have the same problem.Mine defaults at 7.350.
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Re: #uBITX Firmware KD8CEC - IF-Shift etc.
#ubitx
Yes, the passband of the 12mhz filter can vary by rig.
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The fix is using a PBT function within the configuration menu to get the best audio on an LSB signal. Could be that the 45mhz passband varies significantly by rig as well, making USB sound different than LSB. So symptoms like what Gerald's original post to this thread describes. If so, we need another configuration menu item to scoot around clk1 an equal amount for USB and LSB as described in post 44182: > If the 45mhz crystal filter sweeps out to be somewhere else, then add the difference to those two figures. > For example, if the center is found to be at 44.997mhz (so 2khz higher) then the two figures for clk1 > should be 56995000 hz and 32999000 hz. ? Should be able to do this all by ear if stuff is working but just off a bit in frequency. If not working, then might need a diode RF probe or Nik's AD8307. Plotting from the Raduino onto the USB host could be done as per post 32630. Jerry, KE7ER On Sun, Mar 11, 2018 at 11:54 am, Michael Shreeve wrote:
Also, seems like Ashar, some time back, not sure he was talking about BITX40 or uBITX had said that the crystals used for these passbands were not always using quite the same frequency due to the fact that the folks he had making the crystals were not always providing accurate crystals ? He indicated that they would go through the crystals and match them for a group.? So , occasionally , if this is true, the passband of the filter could be different a kc or two ? A Vector Analyzer or tracking generator plus scope could verify this, but, you'd need access to a bunch of radios.? |
Re: #uBITX Firmware KD8CEC - IF-Shift etc.
#ubitx
Also, seems like Ashar, some time back, not sure he was talking about BITX40 or uBITX had said that the crystals used for these passbands were not always using quite the same frequency due to the fact that the folks he had making the crystals were not always providing accurate crystals ? He indicated that they would go through the crystals and match them for a group.? So , occasionally , if this is true, the passband of the filter could be different a kc or two ? A Vector Analyzer or tracking generator plus scope could verify this, but, you'd need access to a bunch of radios.?
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Re: LCD Bumper
For $4 I¡¯ll take a kit. K2CPU On Sun, Mar 11, 2018 at 1:52 PM Roy Appleton <twelveoclockhigh@...> wrote:
--
Ben K2CPU |
Re: #uBITX Firmware KD8CEC - IF-Shift etc.
#ubitx
So we have two knobs to twiddle during receive: ? ? RIT:? Change the tuning on receive only. ? ? PBT:? Change the tuning and the BFO, both in sync This post suggests that "Clarify" is just another name for "RIT". In post 44223, I said this, I still think it's right but am open to arguments: >? ? Yes, changing only the BFO when trying to listen to a signal is generally a bad idea. We need a PBT to set the default position of BFO relative to 12mhz filter passband during calibration. We also need a receive only version, perhaps call it RI-PBT? Then if the other end is tuned up for somebody with a high pitched voice or if there is a nearby carrier that we wish to get rid of, we can adjust our receiver to compensate without disturbing our transmission. Jerry On Sun, Mar 11, 2018 at 11:12 am, Allard PE1NWL wrote:
yes, PBT and "clarifier" are indeed two different things. |
Re: Complaint Department
chris gress
Well said ...chris On 11 Mar 2018 17:58, "ekelley" <ekelley828@...> wrote: Guys & Gals, |
S-Meter from VU2ESE AGC
I've been playing with Ashar's AGC circuit on my BitX40, and it seems to work pretty well if I add additional capacitance across C113 ( I added 4.7uf in parallel because that's what I had on hand) to build back some of the level and actually improve the fidelity. Watching the voltage change on the gate of the 2N7000 looks like it would be a great spot to tap for an S-meter input to the Raduino. Has anyone tried this? The voltage is pretty low, but changes smoothly with the level of signal.
=Vic= |
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