12-15-2018, 09:59 AM
back to your post #150
-your higher AM and FM voltages are understandable because your prints will say the assumed utility voltage operation,, lets assume your prints say 117vac.
depending on the time of day and other factors, your utilty line voltage is higher than in 1947....lets assume you have 124vac. the percentage increase is what
you are seeing.
to your current post...........
I see two sets of FM instructions from post 141 and 150.
it appears the instructions from post 150 continue from the steps in post 141,,,, both start off as "STEP 1" ,, confusing.
on an FM set i just worked on,, down near the power input there is a cap off the HOT leg of power tied directly to ground.
parallel to that is a single wire spade connector hanging in the wind.
the instructions say to tie this wire directly to the FM termainal of the radio.
long story short,, the radio does not have a built in FM antenna ,, *BUT** it uses the actual power cord Line 1 or L1 or hot leg,,, as a "default" FM Antenna incase you dont have an external one on hand.
i am going to backpedal your posts to see if i see your FM being able to use an alternate means of signal reception other than an aerial FM.
reason i bring this up is on my set, with no external FM antenna hooked up, the radio got a lot of FM reception and thats because the power cord hot leg is the other antenna.
what this means is the power cord should be approx 56'' long to come close to the FM recpetion capability. Obviously the ground or return ref signal depends on the N leg to complete the antenna circuit.
In your case,, i am hunting down all the band selector switches "showinng" the FM selection is wired, then tracing out that path.
here is what i may try...
connect your box antenna back up,, or any other two lead antenna to duplicate normal FM operation needs.
set a small modern radio next to your set and tune to a station that comes in on FM.
power up your philco which is set to FM.
rotate your philco tuning cap to see if your philco interrupts the reception of the modern radio.
shut off moodern radio leaving the philco on.
adjust your sig gen to the frequency of the station that came in strong.
loosely wrap a few turns of insulted wire round your box antenna.
connect your sig gen to this wire you will have stripped back a tad.
turn up the vol on the philco set.
rotate the tuning cap left or right in an attempt to "hear" the sig gen signal,, hunt it down.
or..............
rotate the sig gen left or rith to "hunt down" were this signal is actually at on the philco.
it looks like you have a pair of wires factory installed from the 4 position terminal block.
with power off......... and with FM selected............
see if you have continuity from the 4pos terminal block terminal 4 to chassis.
jumper wire around C410 near L405 on your prints.
check you have less than an ohm from the 4pos terminal block terminal 2 out to pin 5 of the 6AG5.
-your higher AM and FM voltages are understandable because your prints will say the assumed utility voltage operation,, lets assume your prints say 117vac.
depending on the time of day and other factors, your utilty line voltage is higher than in 1947....lets assume you have 124vac. the percentage increase is what
you are seeing.
to your current post...........
I see two sets of FM instructions from post 141 and 150.
it appears the instructions from post 150 continue from the steps in post 141,,,, both start off as "STEP 1" ,, confusing.
on an FM set i just worked on,, down near the power input there is a cap off the HOT leg of power tied directly to ground.
parallel to that is a single wire spade connector hanging in the wind.
the instructions say to tie this wire directly to the FM termainal of the radio.
long story short,, the radio does not have a built in FM antenna ,, *BUT** it uses the actual power cord Line 1 or L1 or hot leg,,, as a "default" FM Antenna incase you dont have an external one on hand.
i am going to backpedal your posts to see if i see your FM being able to use an alternate means of signal reception other than an aerial FM.
reason i bring this up is on my set, with no external FM antenna hooked up, the radio got a lot of FM reception and thats because the power cord hot leg is the other antenna.
what this means is the power cord should be approx 56'' long to come close to the FM recpetion capability. Obviously the ground or return ref signal depends on the N leg to complete the antenna circuit.
In your case,, i am hunting down all the band selector switches "showinng" the FM selection is wired, then tracing out that path.
here is what i may try...
connect your box antenna back up,, or any other two lead antenna to duplicate normal FM operation needs.
set a small modern radio next to your set and tune to a station that comes in on FM.
power up your philco which is set to FM.
rotate your philco tuning cap to see if your philco interrupts the reception of the modern radio.
shut off moodern radio leaving the philco on.
adjust your sig gen to the frequency of the station that came in strong.
loosely wrap a few turns of insulted wire round your box antenna.
connect your sig gen to this wire you will have stripped back a tad.
turn up the vol on the philco set.
rotate the tuning cap left or right in an attempt to "hear" the sig gen signal,, hunt it down.
or..............
rotate the sig gen left or rith to "hunt down" were this signal is actually at on the philco.
it looks like you have a pair of wires factory installed from the 4 position terminal block.
with power off......... and with FM selected............
see if you have continuity from the 4pos terminal block terminal 4 to chassis.
jumper wire around C410 near L405 on your prints.
check you have less than an ohm from the 4pos terminal block terminal 2 out to pin 5 of the 6AG5.
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