[ICOM] R7000 dumb question of the day

[Bonddaleena at aol.com]

In a message dated 12/2/2005 4:35:24 PM Eastern  Standard Time, 
sdaitch at ibb.gov writes:
The FM broadcast band uses 75 kHz  deviation as 100% modulation, so it will 
be very wide
for the receiver  combination you are using.

Take a look at the TV station's audio, where  25 kHZ deviation is considered 
100%
modulation.

The NOAA should be  narrowband FM.

Sheldon

Bonddaleena at aol.com wrote:

> In a  message dated 12/2/2005 2:49:53 PM Eastern  Standard Time,
>  kulow at epix.net writes:
> Does the R7000 even need the preamp or  is  the noise figure of the
> preamp higher than that of the R7000?   A  preamp ahead of my R7100
> actually makes things  worse.
>
> 73
> Bob  WA2UEH
>
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> ----
> Your Moderator: Dick  Flanagan K7VC,  icom-owner at mailman.qth.net
> Icom Users Net: Sundays,  1700Z, 14.316 MHz
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>
> Thank you to all who replied... OK,  here's Fridays 'dumb question /
> statement'.....
>
> I had a  thought about using the 756PRO as a Panadapter for the R7000. the
>  results were mixed.
> Allow me to explain.....
>
> Tuning the  PRO to 10.7 Mhz and feeding it a DC BLOCKED signal from the  
R7000
>  IF output into the rear 1/R receive only terminal, worked perfectly  while
> listening to the local NOAA broadcasts.
>
> (By the  way, what the heck kind of modulation do they use? Sounds the same
> on AM  or FM!)
>
> Next a visit to the airband. Man, this worked fantastic!  Very weak aircraft
> signals that were just detectable (and did not move  the s-meter on the 
R7000),
>  were now S-9 on the PRO. Note, there  was NO increase in the basic noise
> level.  In other words, when the  pilot quit transmitting, the s-meter on 
the PRO
> dropped  to zero. I  was able to see different aircraft / tower signals 
'pop' up
> on the   PROs display with the R7000 fixed on one frequency. So far, so  
good.
>
> Next, I tried the FM broadcast band. This is where things  got confusing.
> Stations were basically unreadable. The PRO indicated a  VERY wide and 
strong
> signal on the display. I tried every combination of  FM, FMn, AM, Filter,
> Attenuator, etc, but I just could not make the  signals sound good. It 
sounds as  if
> they were waaaay off  frequency.
>
> I know, this is a silly combination, but the airband  and NOAA results were
> SO good, I'm glad I tried it.
>
> Any  thoughts as to why the FM is FUBAR???
>
>
> thanks for your  patience!
>
> ron
>
> N4UE
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> 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/

----
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/_ (http://www.qsl.net/icom/)   


Sheldon, THANK you!!!! I did not realize that the signals were SO wide. Of  
course, the PRO only goes up to 15 Khz. No wonder the FM signals were filling  
the 'scope with a 100 Khz span.
 
So simple, yet I am so thick!
 
ron
 
N4UE