Just to add to Bill's answer to issue 3, you will also get better results with
the 7300 if you run with the AGC "OFF" as that can also cause issues as your
receiver automatically reduces the gain and can lose weaker signals in the
presence of a stronger one.
73,
Jim S.
N2ADV
> On Jan 6, 2017, at 11:23 AM, Bill Somerville <g4...@classdesign.com> wrote:
>
> Hi Neil,
>
> some comments in line below.
>
>> On 06/01/2017 15:25, Neil W3NTP wrote:
>> 1. Version 1.7 is downloaded as a .exe file which is deleted by Norton
>> Security Suite. Suggest you use a proper installer program to get
>> around antivirus programs deleting the software. This can be a pain to
>> those not familiar with disabling the security software.
> I suggest you replace Nortin Security Suite with a more reliable AV
> product. The issue is not that our installer, and it is a "proper
> installer", is being matched with some generic virus signature and the
> resulting false positive is worse than worthless.
>>
>> 2. Better handling of ICOM-7300 driver communications. I get COM port
>> conflicts on occation with the new release. When using version 1.6, I
>> configured the software for a ICOM-7100 and it handled the COM ports
>> fine. With the ICOM-7300, Ver 1.7 will display communication error to
>> Rig can not communicate. To fix, I power cycle Rig and restart WSJT-X.
>> This can be a pain, but did not have this problem with vrsion 1.6
> Please report the exact error message received including the details
> shown in the "Show Details" box. Do not use auto baudrate detection on
> your rig, it is not reliable. Turn off "CI-V Transceive" mode on your
> rig as it causes unsolicited CAT transmission from the rig which
> interferes with traffic from WSJT-X.
>>
>> 3. Very strong JT9 signals can overload the inputs to the receiver and
>> I can not receive very strong JT9 signal,where as +5 and below I can
>> decode down to about -15 or so. I wonder is JT9 has a problem syncing
>> with the signal. Also responding to JT9 signals always works, whereas
>> calling CQ and getting a strong response never works. Not sure the
>> problem.
>
> Try reducing the RF gain on your rig if it is being overloaded. Once
> overloaded clipped signals get into the digital domain there is
> virtually nothing that can be done to accurately recover the strong
> signal or any other signal in the passband. You should be able to decode
> JT9 signals between about +40dB (I doubt you will ever see a signal this
> strong unless your Rx noise is virtually nil and your front end can
> withstand several volts!) and -27dB, if you are not able to do that then
> perhaps you need to adjust your gain profile between the aerial and the
> PC such that no stage overloads.
>
> What you are describing sound like a possible combination of one or more
> of mis-adjusted gain levels, RFI, and time synchronization errors.
>
> 73
> Bill
> G4WJS.
>
>
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