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This means stock heat sink supplied is just enough for ft8? On Sun, Jun 3, 2018, 4:30 PM Ashhar Farhan <farhanbox@...> wrote:
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The ft8 has an overall cycle of 50%.i use it with the standard issue heatsink. - f On Sun, 3 Jun 2018, 16:07 Ghericoan, <boakawizkid@...> wrote:
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I am not using the irf510 in my ubitx, but rather the irf630. My heatsink is an old pentium 4 sink cut in half with both fets bolted to it through mica insulators and thermal grease. On FT8 the heatsink does a wonderful job and only gets luke warm, even with back to back QSOs. However, on modes like WSPR, I had to attach a small fan or the sink would become too hot to touch. But I am also pretty hard on my ubitx with running the PA on 36 volts and 1-1.4 amps. (I consider one amp of current to be running the PA wide open since I use a bias current of 160ma) On Sun, Jun 3, 2018, 5:44 AM Praba Karan <vu3dxr@...> wrote: What are heat sink requirements of ubitx for ft8 and other digital modes?. Just binding irf510 on back panel of casing(like in sunils case) is enough to withstand heavy duty cycle demanded by ft8? --
---------- N5WLF, Greggory (or my nickname, Ghericoan) General Class, Digital Radio Hobbyist |
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Re: Instruction Manual needs revision
#ubitx
I'm only speaking for the CEC firmware, I don't know if the factory firmware has the same behavior.
I've noticed the calibration and the "VFO" "interact". Probably a bug. It you do a calibration and then decide to do it again to improve on it, the calibration returns to the starting point. However, the audio gets thinner and thinner with each re-calibration. The solution (work around) to this, is to turn the power off and then on to the uBITX before each time you do a calibration. When you turn the encoder during a calibration two values are incremented or de-incremented; the "calibration" and the "usbCarrier" values. What I suspect is going on is when you enter the calibration mode the "calibration" value is reset to zero, but the "usbCarrier" value is incremented or de-incremented further from where it was last. Tom, wb6b |
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Re: RF power chain mods and improvements..
How much down are the spurs? Are they predictable (translated)? Even with an unmodified Ubitx? Il 03/giu/2018 03:28, "ajparent1/KB1GMX" <kb1gmx@...> ha scritto: Yes its a significant issue.? ?When tuning the 28 to 29 mhz range the spur falls in the |
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Re: Amazon
¿ªÔÆÌåÓýHi Farhan, you know I have been a seller on amazon for over 6 yrs selling data storage systems, HDD Docks etc. their commission & other charges are too high and they even penalize the seller if the goods don¡¯t reach the buyer also in case of COD if the buyer does not take delivery the seller is charged shipping costs both ways so also in case of returns There by you may have to increase ?you selling price to cover such unforeseen losses I suggest selling, on your own HF signals is economical & safer. You are doing a great job and we appreciate all your efforts Thanks 73 de Pop VU2POP ??? ? From: [email protected] [mailto:[email protected]] On Behalf Of Ashhar Farhan ? We have been looking at Amazon for some time. Amazon charges? heavy fee for their 'FBA'. It would add another 25 USD to the cost. We figured it wouldn't make sense to do that. We are still exploring if we can fulfill the orders on our own for Amazon customers. It is a call that HF Sigs will have to take. I only work around here... ? - f ? On Sat, Jun 2, 2018 at 12:50 AM, Terry Morris <terry.kb8amz@...> wrote: I have used PayPal on Amazon. ? Terry - KB8AMZ ? |
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Re: Can't get my uBitX to transmit CW on the Dial frequency
The CEC code has a lot of very good options. The options do make it a bit more of a challenge to work through. ?There may be more "adjustments" made elsewhere in the code. There are a number of if statements that change the frequency logic depending on a CW mode. However,?I'm just beginning to work through the code myself, so have not worked through the details.?
The CEC firmware has specific CW modes, so it has more possible solutions to the transmit/receiver issue offset. The factory firmware (unless it has been updated since I tried it) does not have a specific CW mode, so that is why it seemed the simplest solution was just to display the transmit frequency when the uBITX was I the "CW" mode by virtue of "CW" being displayed while it detects the key is being used.? Tom, wb6b |
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Re: A steal for Arduino Experimenters
Mike aka KC2WVB
Try this. You might like the actual book better anyway. ?Getting Started with Arduino,?available at?,?, and?. On Mon, May 28, 2018, 9:25 PM AG?H <[email protected]> wrote: I ordered and received the Basic Starter Kit from Bangood.? The kit, however, has no 'help' manual but a later post included a web address from Bangood to send for the free PDF starter guide.? That link did not work.? I wrote Bangood and, after two requests, received a 75mb zipped file.? I tried to unzip it and was given the message that the file couldn't be unzipped as it was corrupted. |
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Re: Can't get my uBitX to transmit CW on the Dial frequency
Well, there's definitely and issue there... Now I could get my uBitX to Transmit on the exact Dial freq changing those lines in the code. but... The CW RX BFO isn't getting recalled or applied or something, I mean I can get it to zero beat when adjusting it in the menu but somewhat it just revert back to where it was before when I press the PTT to save it no matter what I do. the "number" setting remains 11.997.xxx... or whatever but it just doesn't do anything to the actual CW RX freq on CW modes just when I press the PTT to save the freq shifts to where it was before, no change there on RX... |
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Re: S meter
#ubitx
#ubitx-help
#arduino
You must have a reasonable grasp of English (and Arduino C) to have got this far - I'd suggest read it all again, and be accurate in your communications (both here and to the rig!).
73 Dex ZL2DEX |
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Re: My Ubitx pics
WOW effect! Il 03/giu/2018 02:59, "Larry Smith" <815cpu@...> ha scritto:
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Re: RF power chain mods and improvements..
¿ªÔÆÌåÓýAllison
Am I correct in that all of the following amateur bands are affected? 18.068 - 18.168 MHz 21.000 - 21.450 MHz 24.89 - 24.99 MHz Something around 26-27 MHz (varies by region) 28.000 - 30.000 MHz The bands from 18MHz - 21.450MHz at least will have the offending spur stripped out in the LPFs after the finals.?? I agree that amplifying these spurs is not ideal and adds to the problem of drive...? I speculate that this is why there may be a low in power output around these frequencies?? However, the spurs generated at 26MHz and above won't be stripped out by the finals LPF at all, nor by the BPF (actually an LPF) built for RX as these all fall below the desired signal frequency.? This makes it likely that 28MHz is non-compliant with at least US emission standards. At a minimum, an HPF needs to be switched in for 24MHz and above in series with the RX LPF. It may be that two filters could be substituted for the RX filter with a single digital line controlling the switch over: Below 22.5 MHz, a LPF cuts in with a threshold just above 22.5 MHz, killing off all the unwanted mixer products. Above 22.5 MHz, a HPF cuts in with a threshold just below 22.5MHz, again killing off all the unwanted mixer products. On Rx the exiting LPF is inserted.?? No new data line is required to switch the RX LPF in/out.? This can be controlled by the TX line. Inserting new filters in the TX line would require a couple of cuts on the board either side of the existing RX 33MHz LPF filter. Overall then - 2 relays, and 2 filters (1 LPF and 1 HPF) to solve the problem. What do you think? Mike ZL1AXG On 3/06/18 1:28 PM, ajparent1/KB1GMX wrote: Yes its a significant issue.? ?When tuning the 28 to 29 mhz range the spur falls in the
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Re: Can't get my uBitX to transmit CW on the Dial frequency
Thanks for your reply Tom!
Been fiddling a bit more with the issue and my solution(?) was to edit the ubitx20.ino lines 504 and 508 and deleted the "+sidetone" and "-sidetone" and then proceeded to adjust the "CW RX freq" on the menu until perfect 800hz on zero beat. That seems to fix the issue but I'm hoping to hear from Ian or someone with more experience since honestly I just understand like half of the .ino code there Hehe. dunno if I'm messing something else. 73, Dan Hk4DEI |
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Re: Nextion Display
¿ªÔÆÌåÓýJack
The nextion displays have a built in processor on the driver card.? This is configurable with a supplied Windows client. Essentially the nextion talks to the raduino with serial commands sending "meta commands".? E.g. I am now on 3.512.245 MHz.??? Or in the other direction, "LSB selected".?? In codes of course! This provides complete independence between the display software and the hardware control of the rig.?? People can come up with their on UX for the display independent of a standardised protocol being developed to interface with the CEC firmware. Makes a whole lot of sense to me! Mike ZL1AXG ubitx.net On 3/06/18 2:12 PM, Jack Purdum via Groups.Io wrote:
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Re: Can't get my uBitX to transmit CW on the Dial frequency
Yes, this is extremely confusing. The transmit frequency is offset by the amount of the sidetone setting. The software gives you no indication of this offset. ?The simplest solution would be for the display to change to the transmit frequency when CW is key down, and the "CW" mode is displayed. At least you would know what is happening.?
In the CEC firmware, using the manager program, you can check the "Enable Adjust CW Frequency" checkbox and the transmit frequency will be displayed instead of the receive frequency. Here is a similar thread:?/g/BITX20/message/50224 Tom, wb6b |
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Re: boosting the power on 28 MHz
#ubitx
Allison,
In digging through my junk box I found a package of 2n5179's. Would those work for Q911/Q912 in your estimation? Or is the 300mw dissipation too low for use in that area? They have an ft of 900Mhz to 2Ghz which should be more than sufficient. tim ab0wr On Sat, 02 Jun 2018 18:26:16 -0700 "ajparent1/KB1GMX" <kb1gmx@...> wrote: Essentially the same The 2n2222a has a few minor spec notes but they |
Jay - WS4JM
Ghericoan
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