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Title: Navy LM-14 frequency meter Post by: W2YH on April 19, 2023, 11:23:03 AM I have an LM-14 I would like to get working. Does anyone know the filament and plate voltages necessary for this model? Plenty of info on the web for most other models but not the "14". A schematic and manual would also be very helpful.
Title: Re: Navy LM-14 frequency meter Post by: PE9ZZ on April 20, 2023, 03:26:31 PM Is it this device (https://www.radiomuseum.org/r/military_heterodyne_frequency_met.html)?
Tjerk, 9ZZ Title: Re: Navy LM-14 frequency meter Post by: KC2ZFA on April 20, 2023, 04:43:02 PM seems all the LM’s are the same except for means of powering
them. The LM-13 manual on the web has charts comparing the various versions. Title: Re: Navy LM-14 frequency meter Post by: WB6NVH on April 22, 2023, 10:13:50 AM Power supplies are easy to make if you didn't get one with it. Just regulate the B+. The suffix just means the purchase contract and who made it. Hopefully you got the cal. booklet with it. They are serial number matched to the instrument. These make a pretty nice VFO with a buffer amp or a way of spotting a frequency exactly when using a BA receiver that has miles between dial marks (most Hammarlunds and Hallicrafters...)
Title: Re: Navy LM-14 frequency meter Post by: w7fox on April 22, 2023, 01:30:18 PM I use an LM18 meter as NVH does above. Here is some information that may be helpful. AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
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