S58J
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No sidetone in CW
« on: 28. April 2018, 21:40:14 »
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Hi
In order not to open new subject I hope it is ok to ask here. I have a question regarding CW sidetone. On my mcHF rev 7 I don't hear any tone when keying. I can see characters on the screen when transmitting with my key, but no tone. Same with TX Tune on or off.
STG is set to 15, CW side/offset is 750Hz, CW TX/RX delay is 0ms.
What setting am I missing?
Looking forward to your reply.
Janez, W4/S58J
Edit: No, ist is *not* ok to highjack another thread for use with a new issue....
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| « Last Edit: 29. April 2018, 07:25:27 by DF8OE » |
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S58J
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Re:CW TUNE HELPER
« Reply #1 on: 29. April 2018, 01:47:48 »
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I need to amend my previous statement.
After doing PA Bias and 5W Power Adjustments I noticed that now I have CW tone but its volume is based on 5W PWR Adjust setting for each band. For example if 5W PWR Adjust on 80m = 3 then I have on 80m way lower tone volume than for example on 17m where 5W PWR Adjust = 15. On 17m the CW tone volume is much higher.
The current on 80m, during 5W CW tune is 1.87A, while on 17m is 2.03A. I guess it is RFI related. I haven't done shielding mods yet, neither I have yet termally connected the SI570 (U8) and MCP9801 (U10).
In any case I will have to repeat 5W Power Adjustment with external PWR-meter anyway since I have used mcHF's Power meter which by itself hasn't been calibrated so far.
Just a comment for mcHF rev 0.7 builders:
The SWR bridge design error from rev 0.6 is again repeated in rev 0.7. You need to put the end of T3 directly to the BNC. Now I have normal SWR readouts without the need for further modifications. Check attached photo.
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S58J
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Re:CW TUNE HELPER
« Reply #2 on: 29. April 2018, 01:48:50 »
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The photo:
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S58J
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Re:CW TUNE HELPER
« Reply #3 on: 29. April 2018, 02:29:27 »
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I can confirm that different CW tone volumes on different bands are NOT RFI related. Same phenomena is present even with TUNE off (no TX). STG is the same all the time.
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peter_77
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Re:No sidetone in CW
« Reply #4 on: 29. April 2018, 10:37:02 »
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| You need to put the end of T3 directly to the BNC. |
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Nope. Not in any case.
Its technically better to leave the one end from T3 on the upper part of the RF PCB. This is a long described modification from Ver. 0.4 to 0.6
See here:
https://www.amateurfunk-sulingen.de/forum/index.php?board=15;action=display;threadid=708 (scroll to bottom)
Otherwise you can also reverse the SWR bridge in the software setup but thats not the best solution.
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| « Last Edit: 29. April 2018, 10:37:21 by peter_77 » |
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