[1000mp] Help on Carrier Point Offset Adjustments

Thu, 10 Oct 2002 09:20:12 -0400

Amen!
    Having for many years to deal with setting "carrier" frequencies in
non-amateur frequencies, I too echo that one needs a bit of training
before "setting" can be done by ear.
    I suggest using CHU on USB at 7335 kHz to practice.  First calibrate
your frequency readout by going to CW narrow and using spot to
zero-beet.  I expect that you will be within 5 Hz.  This gives one
confidence about the receiver's readout.
    Then go to USB (most of CHU is on USB), shut your eyes and tune.
Note where you end up.
    I was once a thesis advisor on a project accurately to measure the
"carrier" frequency of a very pure USB signal (one with essentially no
carrier nor LSB).  It can be done.
    Since too many people are not able to tune their transceivers on
frequency, when I run a long group of DX stations I always leave my
transmit frequency alone and then tune the receiver.  It is common to
need to tune plus and minus 100 Hz.
    73    Mac   N8TT
J. Mc Laughlin  -  Michigan USA
Home:  [email protected]
Office:  [email protected]
----- Original Message -----
From: "John E Bastin, K8AJS" <[email protected]>
To: <[email protected]>
Sent: Thursday, October 10, 2002 9:05 AM
Subject: Re: [1000mp] Help on Carrier Point Offset Adjustments


> At 12:53 PM +0000 10/10/02, RCARIELLO wrote:
> >I have a Yaesu FT-1000 MP.
> >I believe the frequency read out on both LSB an USB is slightly off.
> >I base this comment from having to repeatedly adjust the tuning from
Cluster
> >spots.
>
>  From my experience, _don't_ assume that frequencies you see on the
> cluster are accurate. (Don't assume that the callsigns are correct,
> either.)
>
> I'm running an FT1000MP and I constantly am finding the spotted
> stations on a slightly different frequency from that on the cluster.
> Sometimes up, sometimes down, I'm now used to taking the announced
> frequency as only a general guide, a place from where to start
> searching.
>
> I'm convinced that most hams don't have a clue what the offset of
> their receiver is, or how to calculate the actual frequency of the
> transmission they're hearing.
>
> Heaven help these guys if they get close to a band edge.
>
> 73,
> --
>    _
>   /~\ The ASCII        | J o h n   B a s t i n           K 8 A J S