[Kenwood] TS-830s IF Amp Alignment Question

[Clif Holland]

I don't know where your correction factor came by but I stand by my notes.

According to you the 830 was adjusted to an S-9 reading of 100uv. I don't 
think so.

Clif Holland KA5IPF
www.avvid.com




----- Original Message ----- 
From: "Steve Harrisonusa" <k0xp at dandy.net>
To: <kenwood at mailman.qth.net>
Sent: Thursday, July 31, 2008 8:34 AM
Subject: Re: [Kenwood] TS-830s IF Amp Alignment Question


>> Page 37 of the TS-120 Service Manual has the level conversion chart. It's
>> also in other Kenwood service manuals but not in the 830. I don't know 
>> why
>>
>> Japanese "SG"        American "SG"        My Notes
>> -6db                        .25uv
>> 0db                          .5uv                        -113dBm
>> 6db                          1uv
>> 12db                        2uv
>> 24db                        8uv
>> 30db                        15.8uv
>> 40db                        50uv                        -73dBm
>
> This chart is offset by one row under either column: 0 dB should be 1 uV,
> -6 dB should be 0.5 uV, 40 dB should be 100 uV. I wrote down the correct
> values in all my 120/130 manuals long ago.
>
> One has to keep in mind that there is a difference, decibels-wise, between
> doubling POWER, and doubling VOLTAGE: when you double VOLTAGE, the number
> of dB increase is TWICE that as for power-doubling: that is, 6 dB. That's
> why the formula is 20 * log of the ratio of the voltage increase. For
> power, it's just 10 * the ratio of power increase (or decrease). 0 dBm is
> 1 milliwatt and 0 dBuV is 1 microvolt.
>
> Steve, K0XP
>> 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
>>
>>
>>
>>
>>
>>
>>
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>
>
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