G. Berg
Probably will give a dip or peak on an analog pointer at a certain knob setting of a local oscillator.
You may know of them better today as "Frequency Counter"
When you hear the zero beat you look at the knob setting of the local osc to determine the freq.. sometimes extrapolation is needed.
Today we are spoiled.. we just look at the number on the digital display on a freq counter and it reads the freq.
This beautifully made equipment, dating from 1929, was built for use by Radio Amateurs by General Radio in the USA
The pine box accommodates the wavemeter with its five plug-in coils, one of which, for low VHF, is merely a metal loop and its calibration chart.
http://www.btinternet.com/~allan.isaacs/test3.html
The wavemeter with one of the coils fitted
In order to use the wavemeter one must be able to detect its effect, either on a receiver or a transmitter.
In conjunction with the chart one can then ascertain the frequency being measured.
This is a passive device and works by absorbing energy at the frequency to which it is tuned. If adjusted when closely coupled to an antenna, signal will be sucked away as it were, leaving a dead spot. If positioned next to an oscillator coil it may stop oscillations.
A similar useful device is called a "Grid-dip meter". This is an active device employing an oscillator and a small meter. When brought close to a tuned circuit, resonance is shown by a dip or kick in the meter
:G. Berg
(1) you dont know what it is
(2) you dont know how to use it
(3) you dont know what its worth
(4) you bought it
why on earth would you buy it not even knowing what the value is to know if you got a good deal or made a stupid purchase? unless it was a buck or two i would have done some research first. next time your looking for a wooden mystery box with some mystery components in them give me a call.
dumbass
::G. Berg
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:(1) you dont know what it is
:(2) you dont know how to use it
:(3) you dont know what its worth
:(4) you bought it
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:why on earth would you buy it not even knowing what the value is to know if you got a good deal or made a stupid purchase? unless it was a buck or two i would have done some research first. next time your looking for a wooden mystery box with some mystery components in them give me a call.
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:dumbass
In defense of Mr. Berg, I have from time to time bought vintage electrical equipment that I did not have a clue to what it was or what it did. In the process of restoration and research I had the opportunity to learn about related vintage equipment that led me to a better understanding of tube radios. I also ended up with an interesting and attractive related collection that many marvel at. Also, lets eliminate the name clling in this otherwise excellent forum.
Jon.
:::G. Berg
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::(1) you dont know what it is
::(2) you dont know how to use it
::(3) you dont know what its worth
::(4) you bought it
::
::why on earth would you buy it not even knowing what the value is to know if you got a good deal or made a stupid purchase? unless it was a buck or two i would have done some research first. next time your looking for a wooden mystery box with some mystery components in them give me a call.
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::dumbass
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:In defense of Mr. Berg, I have from time to time bought vintage electrical equipment that I did not have a clue to what it was or what it did. In the process of restoration and research I had the opportunity to learn about related vintage equipment that led me to a better understanding of tube radios. I also ended up with an interesting and attractive related collection that many marvel at. Also, lets eliminate the name clling in this otherwise excellent forum.
:Jon.
I am with you, Jon. I have been to sales where I bought something for a low price and later found out it was a valuable piece of equipment.
Lewis
:What is this?? I picked up at an auction a General Radio Frequency Meter (model 558-P) in original box with 4 original plug-in coils made in Cambridge Mass.. I am not sure what it is or how to use it? Or..whats it is worth....year built?..Rare? Any help in I.D this or direct me to a web site would be much appreciated...THANKS
:G. Berg