Home
Shopping Cart
Contact Us
Search: Advanced search
 
Printable version 
Categories Categories
Products by radio
Accessories
Crystals
Filters
Filter Kits
Mods
Publications
Small Parts


Inrad News Inrad News
News
FAQ
Announcements
Equipment Repairs
Catalog
Price List
Dealers


Your cart Your cart
Cart is empty
 

View cart
Checkout
Wish list
Orders history
Returns



Authentication Authentication
Username

Password

Log in 
Register 
Recover password

If Javascript is enabled in your browser click here



Help Help
Contact Us
Privacy Policy
Terms & Conditions



International Radio :: Products by radio :: Icom :: IC-781 :: IC-781 Roofing Filter Mod

IC-781 Roofing Filter Mod
IC-781 Roofing Filter Mod  
The Icom IC-781 roofing filter mod consists of a 6-pole, 4 to 5 kHz wide filter followed by a high dynamic range, feedback amplifier. The amplifier provides enough gain to override the filter insertion loss.

The IMD dynamic range will be improved 7 to 14 dB for some signal spacings. The main receiver audio response will be reduced about 100 Hz in the SSB mode. Operating the noise blanker will not result in as much degradation of the dynamic range.

The mod inserts a narrow band crystal filter in between the pin attenuator following the first mixer and the grounded gate first IF amplifier. Reducing the bandwidth at this point in the radio helps to keep strong off-frequency signals out of the second mixer where they can cause intermodulation. Transmission is not changed as it does not pass through the roofing filter.

Please see our document titled "A Few Words About Roofing Filters" for more details.

Full installation instructions are available here:

Details
 
Price: $200.00

Options
 
Quantity


If you see this message, your web browser doesn't support JavaScript or JavaScript is disabled. Please enable JavaScript in your browser settings so the online store can function correctly.

 

 

 
Inrad Copyright © 1972-2017 International Radio