[ICOM] IC 735 CW Power Output

[Nathan Moreschi]

All,

Thanks for the responses - I appreciate the input.

I'm amazed how the story has developed with little input from me.

I fixed the problem -

I had a jumper from the antenna switch that was not making a solid 
connection. I replaced the jumper and everything is now fine.

By the way, I've owned many IC 735s in the past. The power was measured with 
a watt meter. The radio does not need alignment in terms of zero beat...

Again...thanks.

73,

Nate/N4YDU
----- Original Message ----- 
From: "Al Waschka" <awaschka at bellsouth.net>
To: "ICOM Reflector" <icom at mailman.qth.net>
Sent: Thursday, August 12, 2010 6:13 PM
Subject: Re: [ICOM] IC 735 CW Power Output


Did you measure the power output with a wattmeter or use the front panel 
meter? Since you quoted watts, I assumed you used a wattmeter.

None of those switches will change the output power, only the reading on the 
front panel meter. In the power mode, the front panel meter is a relative 
power meter, only. It is not calibrated.

If you have access to a separate transmitter and receiver, test the zero 
beat of the 735's transmit and receive oscillators. Transmit key down with 
the 735 and tune the separate receiver to zero beat. Then tune the separate 
transmitter to zero beat in the receiver. It should also be at zero beat in 
the 735. If it is not, then the 735 needs an alignment. If the CW transmit 
crystal oscillator is off frequency, the filter may be limiting power 
output.

This should not have been caused by adding the narrow filter, it is used in 
receive mode only.

Are you doing the CW and SSB tests on the same frequency? The antenna SWR 
could be affecting the output power if you are not. Somewhere around 2:1 the 
735 starts reducing the output power.

AL K5TAN




--- On Thu, 8/12/10, Nathan moreschi <n4ydu at yahoo.com> wrote:


From: Nathan moreschi <n4ydu at yahoo.com>
Subject: Re: [ICOM] IC 735 CW Power Output
To: "ICOM Reflector" <icom at mailman.qth.net>
Date: Thursday, August 12, 2010, 3:21 PM


Thanks Jim - I'll check it out when I get home today.

73,

Nate/N4YDU

--- On Thu, 8/12/10, Jim Hargrave <w5ifp at gvtc.com> wrote:


From: Jim Hargrave <w5ifp at gvtc.com>
Subject: Re: [ICOM] IC 735 CW Power Output
To: "ICOM Reflector" <icom at mailman.qth.net>
Date: Thursday, August 12, 2010, 2:01 PM


Nate,

Check your "Meter" switch. If it is in "ALC" position it will show about 1/2
power which is at the top of the ALC scale.
Make sure the switch is in the "PO" position (not depressed).
If the switch is depressed it will be in the ALC position.
Also make sure the SWR switch in the back of the radio is in the "PO"
position.

Enjoy the nice radio. I have had mine for 22 years and its still going
strong. Mine has only been opened twice. Once to change the battery and the
other time to change the CI-V baud rate to 9600.

73's Jim
W5IFP



> -----Original Message-----
> From: icom-bounces at mailman.qth.net
> [mailto:icom-bounces at mailman.qth.net]On Behalf Of Nathan Moreschi
> Sent: Thursday, August 12, 2010 6:13 AM
> To: ICOM Reflector
> Subject: Re: [ICOM] IC 735 CW Power Output
>
>
> Thanks, but I highly doubt the filter has changed the
> output...the output is
> the same with the filter on or off.
>
> 73,
>
> Nate/N4YDU
> ----- Original Message -----
> From: "GGLL" <nagato at arnet.com.ar>
> To: "ICOM Reflector" <icom at mailman.qth.net>
> Sent: Thursday, August 12, 2010 12:07 AM
> Subject: Re: [ICOM] IC 735 CW Power Output
>
>
> Maybe a carrier adjustment is in order; with the new, narrower filter,
> the carrier position could be slightly off the passband.
>
> Regards
> Guillermo - LU8EYW.
>
> El 11/08/2010 23:56, Nathan Moreschi escribió:
> > Guys,
> >
> > I received an IC 735 the other day and I am having fun with it. I
> > managed to install and INRAD #111 400hz filter tonight without any
> > problems.
> >
> > I detected a problem however when operating in CW. The power out is
> > just 50 watts rather than 100. I get more than 100 watts out on SSB
> > and FM. This is indeed strange to me...any thoughts???
> >
> > 73,
> >
> > Nate/N4YDU ---- Your Moderator: Dick Flanagan K7VC:
> > icom-owner at mailman.qth.net Icom Users Net: Sundays, 1700Z, 14.316
> > MHz Icom FAQ: http://www.qsl.net/icom/ To support QSL/QTH.net:
> > http://www.qsl.net/donate.html
> >
> >
> ----
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----
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----
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To support QSL/QTH.net: http://www.qsl.net/donate.html
----
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To support QSL/QTH.net: http://www.qsl.net/donate.html