[Icom] low output on IC 756

Tue, 31 Dec 2002 10:43:36 -0500

Nate; Be careful with this adjustment. I noted you were using a MFJ power meter
and you did not indicate the DUMMY load. This power verification should be done
with an accurate meter and a accurate dummy load. Especially at the 14 MHz test
frequency. You also mentioned that the PO meter in the 756 was low. This meter
does not measure in watts. Only relative power and is usually not linear. Also
the ant tuner must be off as it can degrade the output up to 10 watts. You sure
don't want to end up with a rig that's destroying itself due to inadequate test
equipment. Just a few thoughts from another 756 owner. Good luck and all the
best for the coming year. Keith, VE3JKC.

Nathan Moreschi wrote:

> Thanks Johnny. I'll give it a try and see what happens.
>
> 73,
>
> Nate/N4YDU
> ----- Original Message -----
> From: "Siu Johnny" <[email protected]>
> To: <[email protected]>
> Sent: Tuesday, December 31, 2002 12:20 AM
> Subject: Re: [Icom] low output on IC 756
>
> > Hi Nate,
> >
> > Assuming the previous owner did not alter the TX peak and transmitter gain
> > of the rig, R618 and R619 on the main unit are the trimmers for the HF and
> > 50Mhz TX output adjustment respectively.  They are located at the left
> hand
> > side of the 455khz IF filter (the front panel is facing you and the bottom
> > side of the rig is facing up).
> >
> > For HF adjustment:
> > 1. set displayed freq 14.100000Mhz
> > 2.Mode RTTY
> > 3.[RF power] Max. CW
> > 4.[Tuner] OFF
> > Connect an RF power meter to [ant1] connector, adjust R618 for 100 watt
> > output.
> >
> > Similar for 50Mhz but set the displayed freq. at 51.000000Mhz and adjust
> > R619 accordingly.
> >
> > Hope this information useful to you but do not blame me for anything going
> > wrong.
> >
> > Happy New Year, 73
> >
> > Johnny Siu VR2XMC
> > ----- Original Message -----
> > From: <[email protected]>
> > To: <[email protected]>
> > Sent: Monday, December 30, 2002 11:14 PM
> > Subject: Re: [Icom] low output on IC 756
> >
> >
> > > Hi Johnny. Thanks for the reply. The 70 percent was measured in cw mode
> > with the
> > > key down. I have an external watt meter (MFJ) and it read the same as
> the
> > meter
> > > on the radio. It's like this on all bands.
> > >
> > > 73,
> > >
> > > Nate/N4YDU
> >
> > ----
> > Your Moderator: Dick Flanagan W6OLD, [email protected]
> > Icom Users Net: Sundays, 1700Z, 14.315 MHz
> > Icom FAQ: http://www.qsl.net/icom/
> >
>
> ----
> Your Moderator: Dick Flanagan W6OLD, [email protected]
> Icom Users Net: Sundays, 1700Z, 14.315 MHz
> Icom FAQ: http://www.qsl.net/icom/