You can do that...
But if you already did, was that the moment they told you - you were off?
I can't say it any simpler then you may need to tweak - and forget using 1kHz tone - not worth the effort.
Monitor on the other radio...
To set PITCH (Passband Tone)
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Tune to hear you - resonate - on the monitor - USB you may need to tweak that CT2 cap, L30 Does LSB and AM is L31...these affect the AN612 - the Balanced Modulator - you don't get very far trying to "fix" on a frequency - by the time you do, you've gone too far.
Use your voice!
These 3 parts - in the 7.8MHz Xtal - are the ones that SET YOUR PASSBAND - too high? Your tinny... Too Low, they hear more Bass tones from your voice - BOTH modes, will send these predominate PITCH tones EVEN AT RESONANCE because you set the Treble and Bass Tonal control (Your PASSBAND) on this thing to do just that - so the 7.8MHz one kind sets the "Tone" that passes thru the AN612.
AM is easy enough.
USB and LSB you have to think in virtual - an "imaginary" frequency which centers on the Pitch of (your) Voice.
You don't and can't tune to it - because it REQUIRES your voice in which to do that very thing - you need your voice to "sound thru" and you tune - resonate, to that.
To use 1K tone is too high in pitch to be useful - you really should send your voice thru the radios passband and you hear it on the Monitor radio - you tune the pitch to meet what you sound like between the ears - resonate.
Now, I know there are TWO IF's you have to fiddle with...
Here's the other...
To Set Frequency (your Center Slot - thru Delta Tune)
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These are the EASIER of the two - once you have the "tone" (your passband) set right
you fiddle with these guys and your Delta Tune - this is the PLL side.
L50 is LSB, L23 is AM and L22 is USB - most of the time you fiddle with this set of coils - once you have the correct pitch of audio to pass thru the AN612 - this side helps you "center slot" and resonate on FREQUENCY. You might have to tweak Carrier Balance to fix this VR4 (148GTL)
Tone is set by 7.8MHz CT2 - USB, L30 - LSB and AM is L31.
Frequency is set by L50 - LSB, L22 - USB and AM is thru L23.
You do your best to make modes sound equal as possible in PITCH of tone.
Do you best to set that mess to walk with your Delta - tune (Clarifier) using the PLL side (L50, L22 and L23)
IT can never be TRULY perfect for USB and LSB filtering is different and processed differently thru the 7.8MHz filter (Inverted and non-inverted)