Hi Everyone - Looking at the circuit board for the 75 mhz and 27 mhz I had one each. The boards seem to be very close to each other. Does anyone know if the 75 mhz can be converted to the 27 mhz system? I do have pictures of both boards.
Thank you
Harold
I can;t imagine that would be very easily accomplished, as there will be many components that have to be adjusted to change from one frequency to another, they aren't really that close together. If the board layouts are really the same and it's just differnet component values, it's POSSIBLE to swap all the differnet components, but you also need to calibrate and align it to the new frequency and that takes some equipment, namly a frequency counter and a spectrum analyzer, which aren't cheap. And knowledge of how the circuit works to tune it accurately.
--Randy
Modeling the Reading Railroad in the 1950's
Visit my web site at www.readingeastpenn.com for construction updates, DCC Info, and more.
I did RF work at these frequencies many years ago. It will be a real challenge for the uninitiated.
You need experience working with tuned circuits, coils, capacitors, etc.
Rich
If you ever fall over in public, pick yourself up and say “sorry it’s been a while since I inhabited a body.” And just walk away.
superdog404 Hi Everyone - Looking at the circuit board for the 75 mhz and 27 mhz I had one each. The boards seem to be very close to each other. Does anyone know if the 75 mhz can be converted to the 27 mhz system? I do have pictures of both boards. Thank you Harold
It will be much cheaper and easier to simply find another 27 mhz unit in good condition and buy it.
Sheldon
If I remember right the 75 was for their onboard and the 27 was for trackside. I got both but only use the 27 right now.
I did find a new in the box old 27 mhz train engineer. What is interesting about it is the circuit board has a number 55003 printed on it. That is the number for the 75 mhz transmitter but this one is 27 mhz. The board is completely different than the other board. It has 3 if cans as opposed to only 1 on the other boards. I suspoect but don't know for sure that it is probably just before the 75 mhz came out.