Search found 15 matches

by ejones
Fri Sep 25, 2015 4:13 am
Forum: RTL-SDR Discussion
Topic: RF filter
Replies: 3
Views: 7426

Re: RF filter

i want to eBay there is a lot of choices. VHF and UHF dont have as many problems but that is because of a 88 to 108 fm notch filter. i dont have to worry that much with those bands because it is not direct sampling. i was have terrible problem with a station at 1440 on MW the homemade high pass filt...
by ejones
Thu Sep 24, 2015 4:25 am
Forum: RTL-SDR Discussion
Topic: RF filter
Replies: 3
Views: 7426

Re: RF filter

adding i want a tunable filter not fixed
since fixed is useless to my just have to change it out all of the time.
by ejones
Thu Sep 24, 2015 4:23 am
Forum: RTL-SDR Discussion
Topic: RF filter
Replies: 3
Views: 7426

RF filter

could someone tell me where i could get a RF filter for hf vhf and uhf
cant find anything.

i use a high pass for commercial AM radio but i get humming from 80m on higher frequencies.
by ejones
Thu Sep 24, 2015 4:15 am
Forum: Off-Topic
Topic: frequency selective levelmeter
Replies: 5
Views: 15827

Re: frequency selective levelmeter

forget the modal it is a band pass filter i used the wrong term

the manual states it is a self contained instrument.
by ejones
Tue Sep 22, 2015 10:46 pm
Forum: Off-Topic
Topic: frequency selective levelmeter
Replies: 5
Views: 15827

Re: frequency selective levelmeter

so it the mean purpose according to the manual is to check the leakage of professional AM transmission equipment. i got the thing to use it as a filter. help me with this where do i get a tunable notch filter for HF my home made high pass filter is not good enough. my level meter operates at 200 hz ...
by ejones
Sun Sep 20, 2015 2:46 pm
Forum: Off-Topic
Topic: frequency selective levelmeter
Replies: 5
Views: 15827

frequency selective levelmeter

i don't fully understand how to use one of these.
can you use them as a notch filter for SDR.
by ejones
Sat Aug 01, 2015 5:20 am
Forum: RTL-SDR Discussion
Topic: HF Reception
Replies: 11
Views: 11454

Re: HF Reception

i found a broadband amplifier kit with 20dB maximum gain. i figured out it is vary difficult to get rid of ''ghost" images before i go any further on sdr# is correct IQ enabled by default. also the amp is the Ramsey AA7C kit that works with just a single 9 volt battery i have the wire come in the wi...
by ejones
Sat Jul 25, 2015 4:08 am
Forum: RTL-SDR Discussion
Topic: direct sampling
Replies: 2
Views: 5137

Re: direct sampling

and to be sure Q branch and I branch are pins on the chip or am i wrong.
by ejones
Fri Jul 24, 2015 2:01 am
Forum: RTL-SDR Discussion
Topic: direct sampling
Replies: 2
Views: 5137

direct sampling

i dont fully understand what direct sampling is.
by ejones
Thu Jul 23, 2015 3:00 pm
Forum: RTL-SDR Discussion
Topic: HF Reception
Replies: 11
Views: 11454

Re: HF Reception

got everything working now and have solved fm radio stations showing up on shortwave frequencies. and now i see the noaa whether station 8 or 10 times on vhf. i am having also a hard time finding a prescaler. i have been getting some very distant stations since replacing the adapters such as japan j...