RE: RE: [drakelist] T-4XB AM question

[Graf Ulrich ICM MP PD ST 1 ULM 2]

How does this spectrum appear if you try to whistle constantly into the mic for a second? Do the sidelines at +/- 20 kHz remain? What about the carrier/sideband amplitude relationship when whistling?

 

Uli, DK4SX

-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]On Behalf Of John_k7fd
Sent: Dienstag, 4. November 2003 06:34
To: Graf Ulrich ICM MP PD ST 1 ULM 2; 'John_K7FD'; Drakelist Mail
Subject: Re: RE: [drakelist] T-4XB AM question

This happens with no background noise and no modulation...just pressing the PTT switch on the mic and taking a look at the bandscope.

73 John K7FD

------- Original Message --------
From: "Graf Ulrich ICM MP PD ST 1 ULM 2" <[EMAIL PROTECTED]>
To: "'John_K7FD'" <[EMAIL PROTECTED]>, "Drakelist Mail (E-mail)" <[EMAIL PROTECTED]>
CC:
Subject: RE: [drakelist] T-4XB AM question
Date: 04/11/03

The relationship of frequencies indicates a carrier modulated with a signal of about 18 ... 20 kHz. The amplitude relationship with sidebands half as strong as the carrier means 100% modulation. Really no modulation? Or just no speech but a lot of background noise and wide open mic gain?

Uli, DK4SX

-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of John_K7FD
Sent: Dienstag, 4. November 2003 05:57
To: [EMAIL PROTECTED]
Subject: [drakelist] T-4XB AM question



Hello,

When I keyed my T-4XB (no modulation) on AM at 3.871 MHz, I took a 'look' at
the signal on my IC-756ProII band scope. What I saw has me a bit concerned:
I see my signal has two smaller carriers on each side -- one at 3.851 MHz
and one at 3.889 MHz. It appears the relative amplitude of the side signals
are about half the strength of the carrier on the intended transmit
frequency...

...has anyone come across this before?

Thanks,

John K7FD

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