[ICOM] IC-756PROIII No Transmit

Fri Jun 19 22:28:13 EDT 2009

Funny that I've not had one problem with the FT1000MP but have had 5 
with the PROIII. with both hooked to the same antenna system at the same 
time! Maybe the PROIII is overly sensitive to this problem?
    Phil N0KE

Larry wrote:
> I definitely agree with Larry. A coax run can act like a capacitor and when
> you connect it to your rig you most assuredly can zap it then. You had
> better have a drain on it somewhere.
>
> Larry
>  
> The real Wizard of OZ
>  
> http://www.w3oz.com
> -----Original Message-----
> From: icom-bounces at mailman.qth.net [mailto:icom-bounces at mailman.qth.net] On
> Behalf Of Lawrence Young
> Sent: Thursday, June 18, 2009 10:47 PM
> To: ICOM Reflector
> Subject: Re: [ICOM] IC-756PROIII No Transmit
>
> Phil: I am not an" Icom" in all cases type of guy, having owned many
> different rigs in over 50 years of ham and professional radio design. I
> certainly can understand your frustration. Not having examined and measured
> your stations antenna system. I am surmising that you have a severe case of
> ESD. This can happen in locations of dry as well as snowy weather. Usually
> the stations involved have little or inadequate ESD protection. This is best
> done at the antenna itself. All antennas should be at DC ground potential.
> A  1:! voltage balun, or a 1:1 dc continuity current balun will usually
> suffice, or an RF choke or resistor across  the antenna feed point to drain
> any static build up.
>    There is a video on U-Tube with a ham demonstrating an arching voltage
> discharge across the pl-259 plug of an antenna. Just imagine how much
> voltage it takes to be able to do that. Hundreds, perhaps several thousand
> volts.
> I just can't believe you have a lemon, but anything is possible including
> your antenna system.
> Larry K4LXV
>
> --- On Thu, 6/18/09, Phil Krichbaum <vailphil at sopris.net> wrote:
>
> From: Phil Krichbaum <vailphil at sopris.net>
> Subject: Re: [ICOM] IC-756PROIII No Transmit
> To: "ICOM Reflector" <icom at mailman.qth.net>
> Date: Thursday, June 18, 2009, 9:02 PM
>
>     I have a  PROIII purchased in August 2007. The first hour I used it 
> the xmit went to super QRP after two QSOs on 20 CW at 5w and one at 
> 100w. I sent it to Icom and they charged me over $250 to fix the problem 
> claiming I operated it out of warranty! I have no idea where they got 
> that idea but I did manage to get a refund but still was out the 
> shipping both ways. I was using it into a 20 m antenna with nice low SWR 
> and had not had time to hook up the amp or RX antennas before it went 
> toes up! The next three times it died the same death I sent it to 
> Midwest Technical Service for Tim Moes to work on it as I was 
> unimpressed with the attitude at Icom!  It has now died the same death 
> on transmit a 5th time less than two months after the last repair. It is 
> not the drivers or finals, but fets and diodes, mostly stuff in the 
> tuner. I'm told it is RF getting back in to it. I do have beverage 
> receive antennas but do not bring them in thru the RX antenna jacks, I 
> use one of KD9SV's DXpedition II boxes with a 160/80 preamp, 4 positions 
> of RX antenna switching and the RX antennas come in thru one of the 
> SO239 antenna plugs when not in xmit.
>     I'm seriously convinced I got a lemon from the start. I really like 
> the performance when it works right but I can't continue to go on like 
> this. I wonder if they fixed these problems in the 7600? It seems that 
> this is not a real common problem but the two of us are not the lone 
> ranger either. Does Icom have a policy for dealing with lemons? I'm fed up!
>     73 Phil N0KE
>
> k0bx at arrl.net wrote:
>   
>> Larry, thank you for your comments.  I do agree with what you said.
>>
>> But in my case, I do not have any other antenna connected.  The 1st time
>>     
> was on 20 CW using my Hygain 204BA 4 element monobander with no amp.  I
> agree that some RF must be getting back to the rig somehow, but I do have
> grounding devices on all my antennas.
>   
>> The 2nd time, I just (Like the other guy) just turned on the rig to find
>>     
> it dead on transmit.  I know that sounds like an e-bay thing, "It worked the
> last time I used it". 
>   
>> One of the gentlemen in my DX Club got rig of his PROIII after 3 repairs
>>     
> for the samething.
>   
>> I have used a TS-850S on this antenna for 12 years and when taken out of
>>     
> service it performed on transmit like the day it was brought.  My IC-706MK2G
> have been on this antenna for the last 5 years.  No problems with them.
>   
>> As far as the Burghardt BEV-756, Burghardt recommended it as a solution to
>>     
> my problem even though I do not use a Bev Antenna.
>   
>> It seems that others are having the same problem and only using one
>>     
> antenna at a time.
>   
>> Joe K0BX
>>
>>
>> Stop the insanity!
>> Please do not add me to any distribution lists (Joke, Stories or Junk)
>>     
> without my permission.
>   
>> --- On Tue, 3/24/09, Lawrence Young <k4lxv at bellsouth.net> wrote:
>>
>>    
>>     
>>> From: Lawrence Young <k4lxv at bellsouth.net>
>>> Subject: Re: [ICOM] IC-756PROIII No Transmit
>>> To: "ICOM Reflector" <icom at mailman.qth.net>
>>> Date: Tuesday, March 24, 2009, 9:03 AM
>>> Guys: Products like the Burghardt BEV-756 are designed to
>>> serve as a front end saver for those hams who may not
>>> understand that one cannot safely transmit on one antenna
>>> and leave another one such as a Beverage receive antenna 
>>> still connected to the receiver. I am amazed at the number
>>> of hams that I know who may do this without realizing the
>>> possibility of damage to the radio.
>>> Larry K4LXV
>>>
>>>      
>>>       
>> ----
>> 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
>>
>>    
>>     
> ----
> 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
> ----
> 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
>
> ----
> 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
>
>