[Drake] Problem on 20 meters.

[Jeramy Thibodeaux]

>----- Original Message ----- 
>From: "Carlos A. Archilla" <caab at libertypr.net>
>To: <drake at mailman.QTH.net>
>Sent: Sunday, June 03, 2007 2:59 PM
>Subject: [Drake] Problem on 20 meters.


>Hello all:

>My otherwise fine TR4cw has developed a curious behavior; it won't transmit 
>on 20 meters. Works on other bands, receives OK on 20, it seems to loads ok 
>on 20 but modulation at the mic just won't >produce the normal plate 
>current deviations on the meter, instead, it jumps to 250 ma or so and 
>stays there while you are speaking into the mic.  While this is happening, 
>nothing is heard on the air.  VOX >will >kick right back to receive when 
>you stop talking.

>For a while, I solved this problem by putting the antenna through the 
>MN-2000 tuner.  Switching the tuner in and out would "fix" or produce the 
>malfunction.  The antenna is a TH6DXX with fine SWR as it >works with all 
>my other radios.  Now I just cannot work 20 meters with or without the 
>tuner.  Any of you folks out there have any idea what's happening before I 
>venture into the "inner sanctum" of this >classic?

>Carlos / KP4GL


Carlos,

The others have all given you good advice.

If I am understanding you correctly, this only happens on 20 meters and no 
other band?  If that is the case, I recommend that you check your band 
switch and connections to the switch to make sure you are getting good 
contact for that band.  From your description, it sounds like you are 
getting nothing out on 20 meters now?  Using a schematic and an ohm meter 
should quickly reveal if there is an open somewhere in that circuit.


Jeramy Thibodeaux
kg4azt