Radio Wire Television 1-1205 Schematic

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Manufacturer:Radio Wire Television (Lafayette Radio)

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Page 1:

MODEL il.-1205
This Receiver features the latest in A. M, f F. M., favor that station. On AM, the loop should be turned so
Receiver Design. Eleven (11) tubes plus a Rectifier are that thc edge faces toward the station desired. On FM,
used in the A. M. Y F. M, supcrheterodyne circuit. the entire cabinet should be positioned so that the back
separate antennas are supplied for A. M. and F. M. An is broadsidc to thc direction from which the signals are
automatic frequency control tube is used to stabilize the transmitted.
R M' md slmphfy =""1"gA For the reception of weak or distant stations, or for
1 TYPe 6BA6 _ F~ M- R F- AmPllf'U The folded dipole should be disconnected when an ex>>
1 ;YP? 7F87" FAMMC;V?n?' ternal FM antenna is employed.
l Ty; 634 - Automatidilfiietfdency Control P0 mit dlsgonneft _:hed dllwp wha" an external
1 Type ,IAH7 _ L F__ Amplifier an enna is use on stan ar rua east.
1 Type 6SH7 - Detector Driver (F.M.)
1 Type 6SQ7 -~ lst Audio Amplifier, A. M. Detector 3' SERVICE NOTES'
1 Type 7A6 _ Ratio Detector Failure of the RECCIUC1 to operate may be due tv:
1 Type 7F7 - Znd Audio Amplifier and phase inverter 1) All who not flfmly m sufkcts-
2 Type 7C5 - Beam power output. gv Zugfefgt POW" 50*3k?f~_
i >> an W1 I: ln wrong [)t)5l(lUh.
1 Type SY3/GT Rectifier. 4) Speaker not plugged in
1) The "ON>>OFF" power switch and Tone Control
is the knob at the extreme left of the set, Tum this conf 4_ AUGNMEN1' pkggfpukg FOR A_ MJ
trol in a clockwise direction until the switch clicks and the Equipment Required:
dial becomes illuminated. Turning this control further in R) Broadcast Band Signal Generator
the same direction will change the tone, 5) Output Metal '
2) 'nm Y?l"m?_ C?""?l if the 5?C?"'l knol' fffml 1. Set band switch to AM, advance volume control to
the left. Tummg this control in a clockwise direction fun volume setting
will increase the volume. _ _
2. Connect output meter across voice coil.
3) _The Band Switch is the third knob from the 3 Co _ h S. I G _ b _
left. The extreme countercloclrwise position of this knob b_ mica as 'gm , eneigmr au-os the mndulst
is for phonograph operation, The center position is for __;rit;I1na_d( egrk seglon 0 t iwmable wndenser'
/` F.M. reception. The extreme clockwise position is for B lg _ sl E 0 t E fneramis 'fmld connect to 'llc
A M rece t, stator section and the ground side to the chassis.
_ _ _ Adjust the Signal Generator to 453 kc and with the
4) 'UW T\mmg C0"?f0l 'S fh? Bxtfeme USM hand receiver switched on, adjust the first and second l. F.
I knob._ Turning this knob in either direction will move transformers fm. peak Output as shown on the output
the dial P0""U and Wk?" the 5f3U0"5 U" the A~ M- 0' meter. The signal injected into the receiver should be as
F- M- Bands' small in magnitude as possible, consistent with a useful
I 2 ANTENNAS deflection on the output meter.
'I _ _H be _ _ _I 4. Connect the "high" side of the Generator to the
I n most fuses " W' _not 4 nefesmry lf' use extern" antenna terminal with a 200mmf condenser inserted in
amenn;5' we tire Fcewelljls eillgpped wit? Mr' series. Connect the "ground" side of the Generator to
"Ima C); Fbraep "fn an an in our type 0 e 'mc the chassis. Tune receiver to 60 on the dial, adjust Sig>>
/"\ | antenna or receP"?"` nal Generator to 600kc. Adjust the BC antenna coil for
When inadequate reception is obtained from a desired
l station, it may be necessary to reposition the antennas to
maximum deflection on the output meter. Use a weak
(C)John F. Rider

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MODEL 1 -1205
5. Tune receiver to 160 on the dial. Adjust Signal
Generator to l600lrc. Adjust BC oscillator and BC an'
tenna trimmers for maximum output.
6. Rcpcat operations 4 and 5.
Nora: Points A. B. C. D. E. F. G. and H are noted on
circuit diagram. Points C, :md D have been
brought out to the unused contacts of the speakev
socket at the 'rear of the chassis.
Equipment Required:
a) High frequency Signal Generator with 8S>>l08
Mc tuning range.
b) Signal Generator capable of delivering .1 Volt
c) Audio output meter.
d) D. C. vacuum tube voltmeter with zero center
c) Tuning wand.
Disable A.F.C. dining alignment of F.M. circuits by
Sh07l circuiting point "B" to chassis.
A. Ratio Detector Alignment:
l. Connect V.T.V.M. across point "C" and ground,
Z. Feed l0.7mc unmodulated R.F. Signal into 6SH7
grid (point A) through .Ol ufd. condenser. This signal
should be .1 volt.
3. Adjust primary of Ratio Detector (T>>5) for maxi'
mum voltage indication on V. T. V. M.
4. Connect zero centered V. T. V. M. across point
"D" and ground.
5. Adjust sccondary of Ratio Detector (T-S) for zero
6. Tune l0.7mc Signal Generator higher in frequency
(about Z0Olrc) until maximum voltage reading is obtained
on V. T. V. M.; note this voltage, then tune signal gen-
erator lower in frequency until maximum voltage of the
opposite polarity is obtained. Note this voltage, then if
necessary re-adjust primary of the Det. (T-5) until the
voltages are about equal on either the high or low side of
1. Shunt a l,000fohm carbon resistor acres the prim'
ary of the detector ('l'>>5) (Points G and H).
2. Connect output meter across speaker voice mil.
3. Volume and tone controls at maximum clockwise
4. Connect l0.7mc (modulated 30%) signal genera'
tor 'through .0lufd. condenser across point "F" and
5. Adjust secondary, then primary of (T-3) for maxi'
mum audio output. (Reduce input signal to maintain
output at _5>>watt level.)
6. Connect l0.7mc 30% modulated signal generator
across point "E" and ground.
7. Adjust secondary, then primary of (T>>l) for maxi'
mum audio output. (Reduce input signal to maintain
output at .5'watt level.)
8. Remove 1000-ohm shunting resistor from across
primary of (T'5).
I. Connect V. T. V. M. across point "C" and ground,
2. Connect l08mc signal generator to PM antenna
terminals. If generator impedance is low. Put one 150-
ohm carbon resmor in series with each of the generator
leads, Tune receiver dial to 108 mc.
3. Adjust FM oscillator trimmer (C-51) for maxi>>
mum V. T. V. M. reading. `
4. Adjust FM R.F. trimmer (C-52) for maximum
V. T. V. M. reading. During alignment reduce input
signal to maintain Detector voltage at Z.V.
5. Repeat steps 3 and 4.
6. Feed a 90mc signal into antenna terminals (as in
C>>2), tune receiver dial to signal.
7. Test R. F. coil with tuning wand and if necesary
adjust spacing of FM R.F. coil (L-4) for maximum V.T.-
V.M. reading at 90mc. During alignment reduce input
signal to maintain Detector voltage at 2.V.
8, Repeat steps 2 and 4 if necessary.
9. Remove A.F.C. shorting jumper.
(C)John F. Rider

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(C)John F. Rider

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