[Drake] Birdie in TR-7

[Bob Camp]

Hi

Back when my TR-7 was brand new it came out of the box with several 
birdies. There were several minor changes made in shielding and 
bypassing in the radio to fight the various problems. At the time I 
compared my radio with several other new production radios from the 
same batch. No two radios had the same set of spurs at the same levels. 
Apparently there was enough variation in the manufacturing process that 
the spurs were not repeatable radio to radio. In general if you found a 
spur on one radio and then looked hard enough you could find it on the 
others, but not always.

Most of the spurs were at a level below the bottom division on the S 
Meter. I would say that if you have two or three spurs above the S-1 
level that it's worth checking things out. The usual suspects would be 
shields not connected and card edge connectors that aren't connecting 
as well as they once did. One strange possibility to rule out is junk 
on the power line. I plug stuff into a good old style computer RFI 
filter to check this out.

Of course if the spur really bugs you I'd be glad to give the radio a 
nice warm home .....

	Take Care!

		Bob Camp
		KB8TQ



On Nov 25, 2004, at 7:48 AM, Jim DiMauro wrote:

> Hi All:
>
> I've owned my TR-7 for several months and have operated it exclusively 
> on 80
> and 40 Meters.  Last night I decided to tune around 20 Meters, and I 
> found a
> birdie at 14.340 with a signal level of about S-6.  To confirm that 
> it's
> internal to the radio I checked my other receivers (none heard it) and 
> I
> disconnected the antenna, with no drop in signal level.  Is this a 
> common
> characteristic of the TR-7, or might there be something unusual going 
> on in
> my particular radio?
>
> Thanx & 73,
>
> Jim
> WA2MER
>
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