# Radio Kits, Inc. FM-7 Schematic

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 Model: FM-7 Manufacturer: Radio Kits, Inc.

## Schematics Content:

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BEG
FEB
0
TUNER
MODEL FM 7
0
Note
Example
(C)John F. Rider

MO DEL FM-7
I III I , I Q 1
(C)John F. Rider

#### Page 3:

RADIO KITS, INC. MODEL FM 7
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ALIGNMENT Ppocaovas POR wooEf'rM-i W
Ali nment Procedure without the Use of Instruments
' The I.F. and'd1ecrLvr-Exeter transformers are pretracked at the factory and will
require only to be peaked to compensate for the additional capacities that are
troduced when the set is wired. A signal should be tuned in and each I.F'. transfor-
mer starting from the limiter and working to the first I.F'. should be aligned for
maximum s ignal .
?_LF'. Alignment
Set the dial pointer to correspond with the station transmitting on the high
frequency and of the dial (make certain that the station desired to be received is
transmitting at the time alignment is attempted) . Adjust osicllator trimmer until
the station to be received is tuned ln at the proper dial setting. Adjust the
spacing on the antenna coil for maximum response at the high-frequency end of the
dial. A station is then tuned in at the low-frequency end of the band and the
spacing of the R.F. coil is then adjusted for maximum response. Spacing of the
coil is accomplished with the aid of an insulated fibre tool or a small wooden wedge
Discriminator A11 nment
e o tom s ug of the diecrlminator coil should be adjusted for maximum out
put .
The top slug of discriminator should be adjusted for clear, undisturbed rece
tion. This adjustment is critical and should be adjusted very slowly, until the
proper point is reached. It will be noted as a clear spot between two distorted
points one above and the other below resonance.
ALIHNMENT WITH THE USE OF INSTRUMENTS
If instruments are available they should be used for proper alignment. Insert a
high sensitivity micro-ammeter in series with the limiter grid resistor at the
grounded end (R-l5). Set the signal generator ab lO." mc. Apply this signal to
the grid off the limiter and adjust I.F. to the maximum meter reading. The sig-
nal generator should be applied on the grid of each preceeding stage and the me-
ter left in the limiter grid circuit and each LF. adjusted for maximum response.
Always reduce the input as the sensitivity increases, When the alignment is com-
pleted it should be rschecked by placing the signal generator on the grid of the
l2BE6 and each transformer should be repeaked for maximum meter deflection. The
I.Fs. are now aligned.
The R.F. Section
Apply a 106 mc signal to the antenna terminal. Adjust oscillator trimmer for
maximum response on meter. Then adjust antenna coil spacing for maximum response.
Reset the S?gga1 r;ine?ator fel; 90 megacyclesmq Sgt dial to 90 migacycles. Adjust
spacing of ._ . co or max um res on e. e .F, 3 igment nm, comp1et,d_
The Dlscrlminator Ali nment
Remove t e me er rom the limiter grid circ it d 1 hi -
volt meter in the order of 20,000 ohms por volt gr aug() Eazgmmatubghvdlxtlsmrtzrty
from R-18 to ground. Apply a 1057 mc signal to 81.1.3 of limiter tube. Adjust bottom
slug on discriminator LF. for maximum deflection. Then adjust top slug on the di
criminator I "" 'or zero (minimum deflection) This let 2-
,celvex-., n u _ ' comp es alignmgnt of tm' "?
(C)John F. Rider

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