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In this category you can discuss how to connect a third party software (loggers, CW Skimmer etc.) or devices to ExpertSDR3.

TOPIC: JTDX TCI

JTDX TCI 25 Jan 2023 10:33 #1

  • F4FAA
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Hello all
I do FT8 with JTDX with the TCI protocol.
When I send in DIGIU I have a very wide emission band see photo
73
laurent
2023-01-2511_32_52-ExpertSDR3SunSDR2DXEED06421900084.png
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JTDX TCI 05 Feb 2023 18:25 #2

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230205201832.png


I just consider all is perfect.-60dB it is 60Hz wide.
Last Edit: 05 Feb 2023 18:28 by es1js.
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JTDX TCI 06 Feb 2023 10:00 #3

  • S58WW
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Basics.... Ajust level on left side of your panadapter. Or you should check with other receiver before posting here!
73 Pibo S58WW
SUNSDR2DX
Main shack PC:
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JTDX TCI 06 Feb 2023 16:55 #4

  • CASDR
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S58WW wrote:
Basics.... Ajust level on left side of your panadapter. Or you should check with other receiver before posting here!

That is correct to a POINT Pibo- but V3 gain structure is also to blame for incorrect input readings.

I have done some testing along with Christo (MSHV) the TCI gain structure in JTDX might be set too high,

Reason I suspect this- When comparing a couple previous version of MSHV and JTDX using same power levels in EESDR3

I do see more power out in JTDX and also more harmonics-

Christo and I tested a few settings in and long with different INT divisions - which have reduced power out in MSHV compared to JTDX, but the signal is much cleaner.
from Christo:

HI Rick,
I think all this is enough as power,
Really in MSHV 2.70 rc025 restrictions for not have harmonics and distortions is :

Type Variant 32 Float = max=1.0 real = 0.966
Type Variant int32 = max= −2147483648 to +2147483647 real in MSHV = -21452800001 to +21452800000
Type Variant int24 = max= −8388608 to +8388607 real in MSHV = -8380001 to +8380000
Type Variant int16 = max= −32768 to +32767 real in MSHV = -32735 to +32734

Q = Why you do not make MAX ?
Because have hardware's ho, do not supports MAX, and they will make harmonics and distortions

LZ2HV Christo.

This is just one reason why I think and use MSHV over JTDX- cleaner output.

I also (MYSELF and others) have mentioned that gain levels regardless in V3 for ALC and mic/TCI input levels the metering is bogus and should be used like a on; off switch. it's been that way from the start- but falls on deaf ears and or an attitude of RealWorld users are wrong. LOL


How I personally ended up finding the nice spot was using an external meter- and starting with the TX MIC / input turn up max, and backing it down till power started dropping off on peaks- then dropped the TX input gain down another 3-5 dB according to slider- at that point splatter and Imd fell off ALOT- and for grins when running an AMP I drop the TX input gain level another -2 dB- the Mic and ALC metering in V3 are pointless as far as I am concerned they are hardly even a reference point ( basically the slider is an 1 knob Etch A Sketch of pointless graphing) and have been that way from start.
Last Edit: 06 Feb 2023 16:58 by CASDR.
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