[Elecraft] Q7 base resistance test - low reading

[Don Lerche]

Tim,

Yes, the resistance should be between 2500 & 3000 ohms. As you say a short
on Q7 itself should be obvious, so if nothing looks bad, then after having a
look at the schematic a good place to look may be around T4. There is a
ground connection to winding 3-4, so a short around here to winding 5-6
would put a ground onto the base of Q7.

Good hunting

73 Don, M1DIC
K2/100 #3082

-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net]On Behalf Of nz7c at cox.net
Sent: 30 January 2005 18:56
To: elecraft at mailman.qth.net
Subject: [Elecraft] Q7 base resistance test - low reading


Hi folks -
I just completed the RF board and am doing the resistance checks on page 71.
For Q7 base it requires 2.5 - 3.0 k.  My DVM onky meausres  .4 ohms - no
where near 2300 - 3000 ohms. I assume this means I have a short.  There is
no short between the soldered pads on Q7 and I rechecked the mounting screw
hardware to make sure each part was correctly in place. All other
measurements for the RF board are OK.
Not being anything but a paint-by-number solderer, am I reading the table
correctly? That does mean 2500 - 3000 ohms write?  If so, I very stumped
because a short on this component should be very obvious - but I don't see
it. Can someone offer some help please? Thank you very much in advance.
73/Tim NZ7C

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