L3 isolates the AC line from the rest of the radio and allows it to be used as an antenna for FM reception. After this coil is the usuall line bypass cap, C12. If this coil isn't there the cap would tie antenna to ground as far as FM reception is concerned.
You don't need this coil if an external antenna is used.
You could use an RF choke for replacement. Exact inductance & number of turns isn't critical.
Norm
: I just started on an This Admiral and some modifications were done by someone, listed in Beitmans 1950 page 8. There is an item listed as L-3 the only discription is called coil, this item was removed and jumpered from the power cord to switch. What is the purpose of this coil, if it is critical to proper operation could this coil be reproduced somehow. From the coil diagram on schematic looks like wire wrapped on a form, with lead 3 of one coil to power cord and lead 4 to power switch. The other coil to lead 1 to 35pf then to FM ant. and lead 2 to neg side of silenium rect. Would this be part of the FM ant. circuit and how could I replace this item.
L3 isolates the AC line from the rest of the radio and allows it to be used as an antenna for FM reception. After this coil is the usuall line bypass cap, C12. If this coil isn't there the cap would tie antenna to ground as far as FM reception is concerned.
You don't need this coil if an external antenna is used.
You could use an RF choke for replacement. Exact inductance & number of turns isn't critical.
Norm
: I just started on an This Admiral and some modifications were done by someone, listed in Beitmans 1950 page 8. There is an item listed as L-3 the only discription is called coil, this item was removed and jumpered from the power cord to switch. What is the purpose of this coil, if it is critical to proper operation could this coil be reproduced somehow. From the coil diagram on schematic looks like wire wrapped on a form, with lead 3 of one coil to power cord and lead 4 to power switch. The other coil to lead 1 to 35pf then to FM ant. and lead 2 to neg side of silenium rect. Would this be part of the FM ant. circuit and how could I replace this item.
Great, 33 ohms will work. The purpose of this resistor is to reduce turn on surge and drop a few volts. As long as voltages are close it's doing the job.
Norm
:HI Norm,
: I did a little experimenting here, I did not have an RF choke I made a coil with 15 turns & another 15 turns directly over the first and connected as per schematic works good, nice AM & FM reception with loop ant. I used a 1N4004 to replace the selineum rect, there is a 33 ohm resistor in series with the diode will this be OK.
::Hi Bobby
::
:: L3 isolates the AC line from the rest of the radio and allows it to be used as an antenna for FM reception. After this coil is the usuall line bypass cap, C12. If this coil isn't there the cap would tie antenna to ground as far as FM reception is concerned.
::
:: You don't need this coil if an external antenna is used.
::
:: You could use an RF choke for replacement. Exact inductance & number of turns isn't critical.
::
::Norm
::
::: I just started on an This Admiral and some modifications were done by someone, listed in Beitmans 1950 page 8. There is an item listed as L-3 the only discription is called coil, this item was removed and jumpered from the power cord to switch. What is the purpose of this coil, if it is critical to proper operation could this coil be reproduced somehow. From the coil diagram on schematic looks like wire wrapped on a form, with lead 3 of one coil to power cord and lead 4 to power switch. The other coil to lead 1 to 35pf then to FM ant. and lead 2 to neg side of silenium rect. Would this be part of the FM ant. circuit and how could I replace this item.