[ICOM] 718 Receiver

[David G. Nagel]

George Lee wrote:
> Andy, I am not all that familiar with the 718 but was wondering if there 
> is a way the transmit is locked in the AM or RTTY mode?
> 
> Probably not so but, it sure sounds as if it is somehow locked on the 
> 1/2 power level often found on 100 watt radios when in the AM, FM, RTTY 
> mode.
> 
> Good luck guys.
> 
> 73, George
> 
> ----- Original Message ----- From: <awallacejr at sbcglobal.net>
> To: "ICOM Reflector" <icom at mailman.qth.net>
> Sent: Sunday, December 05, 2004 11:49 AM
> Subject: Re: [ICOM] 718 Receiver
> 
> 
>> Thanks Gary. It is a new Icom power supply with a dedicated connection 
>> to the radio and he is also using an Icom 180 auto tuner properly 
>> hooked up. We also did two hard resets of the radio CPU to no avail. 
>> Also checked the antenna SWR with a MFJ meter--it is under 1.5 with no 
>> tuner. Will try the dummy load approach for impedence problems but it 
>> is interesting that the radio puts out exactly 1/2 its rated power; 
>> not close to 1/2 but exactly 1/2 or 50 watts key down on RTTY.
>>
>> You may know Sandy-N5NBW--who owns the radio.
>>
>> BTW, the little radio is a lot of fun to operate and seems to be a lot 
>> of bang for the buck--especially if we can get 100 watts out ;-)
>>
>> Andy K5VM
>>
>>
>> ----- Original Message ----- From: "Gary Fiber" <g.fiber at verizon.net>
>> To: "ICOM Reflector" <icom at mailman.qth.net>
>> Sent: Sunday, December 05, 2004 11:16 AM
>> Subject: Re: [ICOM] 718 Receiver
>>
>>
>>> What are you using for a power supply?
>>>
>>> I had this happen on an FM transceiver once and found the binding 
>>> posts even though real finger tight were loose.  The transceiver was 
>>> current starved. Tightening up with a wrench solved the trouble.
>>>
>>> Have you got a dummy load to use in place of the antenna. A low SWR 
>>> does not always equate to the correct impedance.
>>>
>>> Its unlikely it would come from the factory so low on output power. 
>>> Possible a bad final could be the problem though they are pretty good.
>>>
>>> Gary K8IZ
>>>
>>>> Hi All-
>>>>
>>>> Have a friend with a new 718 that I helped him set up. No matter 
>>>> what transmit power setting we use ( including transmit= H ), we 
>>>> can't get the radio to put out more than 50 watts. Have very low 
>>>> antenna SWR and received S-9 SSB reports from Calif ( we live in 
>>>> Texas ). Key down in RTTY shows exactly 50 wattts on radio's power 
>>>> meter.
>>>>
>>>> Any thoughts? Could it have a bad power transistor?
>>>>
>>>> Thanks, Andy K5VM
>>>
>>>
>>> Gary Fiber K8IZ
>>> GROL PG-19-6691
>>> Washington State Resident
>>>
>>>
>
A while back I bought and IC-718 on eBay. When I tried to transmit there 
was no output power. I sent the radio into AES for installation of the 
precision crystal and to have the power problem checked out. The report 
was that the transmit power was set to zero. AES did a reset and cleared 
the lockout.
Down load the user manual and check for the proper settings.

Dave WD9BDZ