I'm looking for a notch filter to notch out a nearby translator signal that is weakening my receiver front end.. When the translator is off the receiver gets many weak signals but not when the translator is transmitting. Does anyone have a recommendation for one that is available at a reasonable. price? Thanks in advance
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Where to get a notch filter for a receiver
- Thread starter Radio Bob
- Start date
Used his products before and they work well.
I will vouch for TinLee. Price was lower than MFC, but the shipping, tax, and lead time was higher, being out of Canada.
I purchased a channel pass filter for an HD reciever on a translator at a busy site, and the filter profile was just what the doctor ordered. I was able to verify with a spectrum analyzer and tracking generator.
I have used MFC filters in TV applications with good results. You cant go wrong with either company as long as you choose the correct filter for your application.
I would personally opt for a channel pass if you can tolerate the loss. If you notch one signal, and someone else moves in next door, you will be back in the same boat.
I purchased a channel pass filter for an HD reciever on a translator at a busy site, and the filter profile was just what the doctor ordered. I was able to verify with a spectrum analyzer and tracking generator.
I have used MFC filters in TV applications with good results. You cant go wrong with either company as long as you choose the correct filter for your application.
I would personally opt for a channel pass if you can tolerate the loss. If you notch one signal, and someone else moves in next door, you will be back in the same boat.
Is it a receiver with good shielding and a legitimate coax antenna input? What is your present antenna? With the antenna disconnected, does your receiver still pick up signal from the translator? Something as simple as a quarter-wave stub might be helpful, but it will require some careful measuring and cutting; some RF test equipment would be very helpful in checking and/or tweaking the construction.
I'm placing it in a metal grounded cabinet with metal front door. It will have a single coax F fitting through the cabinet for the antenna and any filters will be placed inside. The power supply is DC and will be filtered to prevent AC from entering.
That sounds excellent. By all means, then, it can't hurt to try a tuned quarter-wave stub first (total cost <$10.00) before trying something costly. However, bandwidth is ~20%, so this may or may not work for you, depending on how close the desired frequency is to the undesired one. I've also thought it would be interesting to try to build a tuned cavity filter (such as are used on 2M repeaters, etc.) but I've never searched for construction details. I will ask some friends who are hard-core hams, perhaps they have plans or articles that describe how to calculate and build a cavity.
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