[ICOM] ProIII and TX5C

[Jan Robbins]

The real problem is, they CAN'T back off the RF gain and have much 
happen, because the ProIII front end is miles wide and there's no "hard" 
front end filter before the DSP.  They sit there and watch the meter pin 
for 30-40 seconds before they can even hear a strong signal.  Note how 
many times the ops (poor ops! I really feel sorry for them) respond by 
saying "VERY BIG SIGNAL, above the crowd."  Their looking for ANYTHING 
above the AGC. And waiting, and waiting, and waiting. 

I really though that lesson had been learned about only-DSP radios a 
long time ago, but I guess somebody missed the message.  And after all, 
the problem is worse on FO-C than most places because there is ALWAYS a 
huge signal wave from north and south America there.

73 to all!  I hope winter is ending for you; it's got a few weeks to go 
in Iowa.  Jan

D C *Mac* Macdonald wrote:
> Do the hotshot SSB ops on this DXpedition not know how
> to back off the RF gain?  Damn, we did that all the time
> on strong signals before "modern" AGC was developed!
> Ya work by layers, strongest to weakest.
>
>
> Mac, K2GKK/5
> Oklahoma City
> Licensed - '53
>
>
>
>   
>> From: mike-2007 at elp.rr.com
>> To: icom at mailman.qth.net
>> Subject: RE: [ICOM] ProIII and TX5C
>> Date: Mon, 10 Mar 2008 18:45:32 -0600
>>
>>
>> I find that an interesting comment. Perhaps the IC-781 isn't going anywhere for
>> a while yet.
>>
>> Mike - KD9KC.
>> El Paso, Tx.
>> DM61rt
>>
>> ΜΟΛΩΝ ΛΑΒΕ (Molon labe. [mo-lone lah-veh] Google it)
>>
>> =============================================
>> The United States Constitution (c) 1791. All Rights reserved.
>> =============================================
>>
>>     
>>> -----Original Message-----
>>> From: icom-bounces at mailman.qth.net
>>> [mailto:icom-bounces at mailman.qth.net] On Behalf Of Jan Robbins
>>> Sent: Monday, March 10, 2008 6:43 PM
>>> To: ICOM Reflector
>>> Subject: [ICOM] ProIII and TX5C
>>>
>>> Boy, it is really amazing to see how badly the ProIII's are
>>> working on SSB at TX5C. You can see great--top of the
>>> world--performance by the CW guys, while the poor SSB guys
>>> are sitting around waiting for the AGC to come down to the
>>> point where they can hear at least a 20-over signal.
>>> CW rates are three to four times the SSB ones or more,
>>> because the SSB ops are twiddling their thumbs. I thought
>>> this had been shown in any number of previous DXpeditions,
>>> but I suppose if you are offered free radios, you take 'em
>>> even if they can't do the job. Doesn't ANYONE know what a
>>> roofing filter is and why it matters? They would have been
>>> better off with 765's.
>>>       
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