[Icom] low output on IC 756

Tue, 31 Dec 2002 15:51:57 +0000

Thanks for the info Keith. I'll keep that in mind as I continue with my tests.

Happy New Year!

Nate/N4YDU
> 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/
> 
> ----
> Your Moderator: Dick Flanagan W6OLD, [email protected]
> Icom Users Net: Sundays, 1700Z, 14.315 MHz
> Icom FAQ: http://www.qsl.net/icom/