Bandpass Filter FAQ

Q: Can a bandpass filter help with an AM broadcast station that is overloading my new transceiver especially on 160 and 80?

Yes. The bandpass filter will block signals below and above the passband. In most cases, the interfering signal will be attenuated almost completely allowing normal operation. Separate bandpass filters are required for each band.

Q: I am thinking about going Single Op 2-transceivers in the next contest. Do I need Band Pass Filters on both rigs?

To get maximum performance from the dual transceiver operation, you should have filters on both rigs. Without bandpass filtering, phase noise and overload hamper receiver performance, even if you are running only low power.

Probably the most important consideration, however, is to protect the input stages of both receivers. This is especially important if you are running high power. There is a very real likelyhood of the amplifier doing serious damage to the off band receiver, if it is not protected with a filter.

Q: Both Single Band and Multi Band Switchable Bandpass Filters are listed. Is one more effective than the other?

The Model 300 and 600 use the same filter module and are identical for all practical purposes.

Q: How do I decide whether I need Single Band or Multi Band filters for my situation?

Basically, if you need to move quickly from band to band, the Multi Band unit is the best solution. The Model 600 can be operated piggybacked with your transceiver's band switching by using a band decoder unit (Top Ten Devices) making it "invisible" from the operator's point of view.

If speed and flexibility are not urgent, manually removing and replacing Single Band filters each time you change bands works as well, technically.

Q: Will addition of a bandpass filter, take care of all of the interference?

A bandpass filter will help to bring IMD problems under control and usually eliminates the vast majority of the interference. Filters can not make up for a poor installation.