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Re: Can't get my uBitX to transmit CW on the Dial frequency
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Re: BITX QSO Afternoon/Evening, Sunday, June 3, 3PM & 7PM Local Time, 7277 kHz in North America, 7177 kHz elsewhere.
¿ªÔÆÌåÓýHeard the buzz, but nothing else here
in NY
WB2VXW On 6/3/2018 7:51 PM, WS4JM wrote: Had a QSO with Jerry in Iowa, Heard another 0 station, but could not get back to him. Does anyone else here the "buzz" that repeats every 8 minutes?
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Re: boosting the power on 28 MHz
#ubitx
Thanks, Allison.
The 2n5179 is actually a 12v part for Vceo. Since I run a 12v regulator to power the mainboard I'm not too worried about exceeding this. Next time I pull the mainboard I may stick two of these in and see what happens. I'll let you know. I already stuck in the smd equivalent of the mpsh10 in Q90 and put 220pf on all the emitter resistors in the drive chain. I see a little more power out on 10m but not much. I keep seeing people saying they are getting power like 18watts out of the ubitx. The mainboard I have in the system now maxes out at 10watts on 80m. Nothing I've done has changed that at all! I've also got some old HP mmic's in a drawer somewhere. I've thought about putting one on a piece of scrap ckt board and sticking it in the chain after RV1 to see what happens. I think they are 7db gain so I don't think they will overload the rest of the chain, especially since RV1 can be adjusted down. Thanks again. tim ab0wr On Sun, 03 Jun 2018 14:55:01 -0700 "ajparent1/KB1GMX" <kb1gmx@...> wrote: First do Q90 with a UHF part then 911/912.? I'm not sure of the 2N5179 |
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Re: Can't get my uBitX to transmit CW on the Dial frequency
Hi Dave,
The CEC firmware does not totally "fix" the issue, but if you use the uBITX Manager software software it can change the CW frequency display to the transmit frequency. Just kind of moves the problem around. If you tune the CW station so the received tone matches the sidetone when you transmit, you should be very close to the same frequency as the other station. Once you know about the transmit offset issue you can mentally subtract the sidetone setting from the displayed frequency to know where you are transmitting. The problem is, that there is no indication by looking at the display that such a thing as the transmit frequency being shifted is going on. And it is somewhat unexpected, and best I can tell undocumented. To see how your version of the firmware is behaving you may want to go here??and see if you can find a receiver that is hearing you. Then check the frequency the waterfall shows you at. Most of these receivers' frequency calibration are fairly accurate, but try to double check to be sure. Tom, wb6b ? |
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Re: Can't get my uBitX to transmit CW on the Dial frequency
Yeah Tom, I'm using CEC firmware because it solved my problem with the paddle on the original firmware, now it just works perfectly (well, the paddle...). Not to mention all the new features. Dave, sure, that's a real problem, I haven't really used CW because of this issue, hopefully the solution is just a bit of code but that is beyond my knowledge, let's wait what will happen in future versions. The CEC firmware is amazing, Thanks Ian ! but bear in mind that it's a bit more complex than the original, I was wondering if this issue was on the original one also. Now that I can transmit on the dial frequency I'm just going to measure the deviation in CW receive and use the RIT to zero beat and make QSO's 73, Dan.
On Sunday, June 3, 2018, 9:36:59 AM GMT-5, Dave de WS1ETI <docame12@...> wrote:
Ok, so this issue is of great interest to me. So far, CW is the only mode I've been working...and unsuccessfully at that. My uBITX is still using the factory installed firmware - I haven't changed over to the CEC ware yet. It seems no matter how I holler at received stations, they just do not hear me. My dial frequency shows the same freq as when in normal USB mode - it does not change. Would this be made simpler if I just went and loaded the CEC software? Thanks, Dave |
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Re: RF power chain mods and improvements..
Its not a drop in.? The filter would likely be hard to find and costly or for a one off salvage from?
an old junker commercial radio.? I think Kenwood radios used a 63mhz filter or maybe ICOM.? so lets do a thought experiment on what needs to be done. The filter would need to be matched and like data for it will require experimental testing. The T30-2 toroids could be reused and rewould and the cap for the L-networks changed as needed.? The entire string of 3904s [all 6 of them] in the 45mhz section would have to be some thing like 2n2369, or better BFR106s.? Then the firmware has to be revised as the first lo needs to be higher to start maybe 65mhz and go up from there.?? So yes it can be done.? I don't have such a part so thats ruled out.? So for a one off maybe, doesn't help everyone though. and even if the filter was not too expensive? thats a lot of SMT and through hole work plus a new firmware.? At the production level it could add significant cost and interrupt the product flow as you have all the material in place and likely paid for. Right now the most feasible option is bandpass filters and switching.? Cost wise the parts are cheap is SMT inductors are used.? The trick there is drop in and play no manufacturing tuning. Allison |
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Re: #ubitx-help
#ubitx-help
Another set of eyes on this, and I concur with Howard.? I didn't see anything obvious that would have caused damage to the Radunio/Nano where TX works and RX is not working.
I would imagine that this shifting has happened to a few people already, easy to do. Regards, Gary |
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Re: RF power chain mods and improvements..
Is it only the cost of the higher frequency IF XTAL filter and the accompanying semiconductors of the driving chain that makes the route of first IF freq. elevation to 62MHz or higher not appealing?
Are there any other technical shortcomings affecting this route of action? Can the existing toroidal cores follow, or they would need upgrading as well? 73 Nikos SV1IYF |
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Re: boosting the power on 28 MHz
#ubitx
First do Q90 with a UHF part then 911/912.? I'm not sure of the 2N5179
not for power but for voltage as its a 15V part if memory serves.? I use it for wideband low power amps but at 12V max. With that its likely not going break anything and may serve fine. I'd be curious to hear. Allison |
Jay - WS4JM
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