[Kenwood] TS-830s IF Amp Alignment Question

Thu Jul 31 10:53:17 EDT 2008

Hi Bill,
When the manual says "40 dB", this almost always is referenced to 1 
microvolt. (It may even say so in fine print somewhere in the service 
manual.) This equals 100 microvolts, a nice strong signal that can 
likely be heard even on a fairly deaf receiver. After peaking the 
receiver, reduce the signal somewhat, say to 10 microvolts and peak 
the receiver again. Then reduce the signal again to -6 dB which is 
0.5 microvolts and perform the final peaking.
FYI, dB as used in this context is = 20 * log [(signal level in uV) / (1 uV)]
Conversely, uV = 10^ [(dB referenced to 1 uV) / 20]
73,
Joe K9LY
At 7:28 AM -0600 7/31/08, Pancake, John W CTR USAF 721 MSG/CEO-PWT wrote:
>Good Morning -
>>>>I'd like to ask the groups help with an alignment question relating to
>my TS-830s.
>>>>Service manual (third edition), page 36, step 15, "IF Amp Adjustment".
>>Calls for applying a 1.9MHz, 40dB signal from an RF signal generator and
>gradually decreasing the generator output to -6dB during adjustment.
>>>>My question: a 40dB signal decreasing to -6dB translates to what actual
>VOLTAGES?
>>My signal generator output is adjustable from 0. 1 microvolt to 3 volts
>(into 50 ohm load).
>>(I don't understand how to convert dB to microvolts).
>>>>Tnx, Bill, w0ng
>