[Milsurplus] BC-640 TVI

[B. Smith]

Some of the worst  TVI was caused by amateurs  getting into the 21 Mc IF of 
the TV sets when transmitting on  40 meters(3rd harmonic) and especially  15 
meters. But the majority of TVI from 2 meters was simply front end overload 
of the TV receiver.

breck k4che
http://home.comcast.net/~smithab11/




----- Original Message ----- 
From: "Jack Antonio" <scr287 at sbcglobal.net>
Cc: <milsurplus at mailman.qth.net>
Sent: Tuesday, October 06, 2009 7:19 PM
Subject: Re: [Milsurplus] BC-640


|I have to wonder how deserved the TVI reputation of the BC-640 really
| was.  Was the transmitter really as dirty as claimed, or was TVI the
| result of running the unit without the proper shields and covers in place?
|
| My thinking is that what we call TV channels 7-13 today, were in WWII
| used a lot for IFF and radar, and if the BC-640 was such a dirty
| machine, are there reports of BC-640s bothering the receivers of
| radar and IFF systems?
|
| Did the military do compatibility studies during WWII of what systems
| could or could not be used near each other?
|
| Just curious
|
| Jack Antonio WA7DIA
| scr287 at sbcglobal.net
|
|
| Rod Hogg wrote:
| > Last BC-640 I was around ended up in local salvage yard, in many pieces. 
It
| > was used a couple times on 2M, but found it generated more TVI signal 
than
|
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