# Frequency frogging

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{{Short description|Term in telecommunication}}

In [telecommunications](/source/telecommunications), the term '''frequency frogging''' has the following meanings: 

# The interchanging of the frequencies of [carrier](/source/carrier_signal) channels to accomplish specific purposes, such as to prevent [feedback](/source/feedback) and oscillation, to reduce [crosstalk](/source/crosstalk), and to correct for a high [frequency response](/source/frequency_response) slope in the [transmission line](/source/transmission_line).  
# In [microwave radio relay](/source/microwave_radio_relay) systems, the alternate use of two frequencies at repeater sites to prevent feedback and oscillation. 

''Note:''  [Frequency](/source/Frequency) frogging is accomplished by having [modulator](/source/modulator)s, which are integrated into specially designed [repeater](/source/repeater)s, translate a low-frequency [group](/source/group_delay) to a high-frequency group, and vice versa. A [frequency channel](/source/frequency_channel) will appear in the low group for one [repeater](/source/repeater) section and will then be translated to the high group for the next section because of frequency frogging. This results in nearly constant [attenuation](/source/attenuation) with frequency over two successive repeater sections, and eliminates the need for large slope [equalization](/source/equalization_(communications)) and adjustments. Singing and crosstalk are minimized because the high-level output of a [repeater](/source/repeater) is at a different frequency than the low-level input to other repeaters.  It also diminishes [group delay](/source/group_delay) distortion.  A repeater that receives on the high band from both direction and sends on the low band is called Hi-Lo; the other kind Lo-Hi.

==References==
{{FS1037C MS188}}

Category:Communication circuits

{{telecom-stub}}

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Adapted from the Wikipedia article [Frequency frogging](https://en.wikipedia.org/wiki/Frequency_frogging) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Frequency_frogging?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.