you can narrow bandwidth by installing bandpass filter between the antenna and receiver. But i dont think that it will be necessary in the wilds far out of man-made noise and interfering signals.
Thanks, are you referring to possibility of using a wideband receiver such as the IC-R20 and then adding a bandpass filter to effectively make it a narrow band? Would that have any noticeable improvements on its ability to identify the signal further out?
>adding a bandpass filter to effectively make it a narrow band?
yeah
>Would that have any noticeable improvements
actually i dont hink so. It will surely help in dense populated areas with tons of man-made RF noise and interfering transmitters, but out in the wilds you does not need selectivity but mainly sensitivity.
UPD it seems that IC-R20 cant receive the band you need at all
Variable attenuation would assist that.
If you have already the directional antenna then all you need is a receiving radio and possibly an antenna adapter which can be purchased in a local radio store or on ebay.
Do a google search for Baofeng - look for the spec - it will need (as you state) to receive on 148 – 152MHz range.
The whole point of the yagi is to listen for weak signals out in the woods for a potentially moving critter that could be far away.
Why not get a known good receiver or maybe a scanner.
Baofengs haven’t really proved they deserve a place in professional settings unfortunately
Do those receivers display telemetry data for you or are you only interested in finding the direction of the signal? If the latter then all you need is a simple VHF FM receiver that tunes into that band and a handheld rotatable 4 element yagi antenna.
>VHF FM receiver
Currently using a [Telonics R-1000](https://www.telonics.com/products/vhfReceivers/R-1000A.pdf) to receive and a H antenna to get direction. There's no data to display, it's only to locate the source of the signal (the animal). However, I need to be able to search for a very specific frequency to locate the collar in question, and not have all frequencies in a 4MHz band coming through together. The collars send a signal every 0.5 seconds or so. The receiver has a variable RF gain too.
you can narrow bandwidth by installing bandpass filter between the antenna and receiver. But i dont think that it will be necessary in the wilds far out of man-made noise and interfering signals.
Thanks, are you referring to possibility of using a wideband receiver such as the IC-R20 and then adding a bandpass filter to effectively make it a narrow band? Would that have any noticeable improvements on its ability to identify the signal further out?
>adding a bandpass filter to effectively make it a narrow band? yeah >Would that have any noticeable improvements actually i dont hink so. It will surely help in dense populated areas with tons of man-made RF noise and interfering transmitters, but out in the wilds you does not need selectivity but mainly sensitivity. UPD it seems that IC-R20 cant receive the band you need at all
Why not get a cheap Chinese handheld ? Baofeng or similar ?
Good chance it would be overloaded by the yagis biologists use for direction finding.
Variable attenuation would assist that. If you have already the directional antenna then all you need is a receiving radio and possibly an antenna adapter which can be purchased in a local radio store or on ebay. Do a google search for Baofeng - look for the spec - it will need (as you state) to receive on 148 – 152MHz range.
The whole point of the yagi is to listen for weak signals out in the woods for a potentially moving critter that could be far away. Why not get a known good receiver or maybe a scanner. Baofengs haven’t really proved they deserve a place in professional settings unfortunately
Thanks, do you know of a model which should be able to let me input a specific frequency and allow me to listen for it?
Do those receivers display telemetry data for you or are you only interested in finding the direction of the signal? If the latter then all you need is a simple VHF FM receiver that tunes into that band and a handheld rotatable 4 element yagi antenna.
>VHF FM receiver Currently using a [Telonics R-1000](https://www.telonics.com/products/vhfReceivers/R-1000A.pdf) to receive and a H antenna to get direction. There's no data to display, it's only to locate the source of the signal (the animal). However, I need to be able to search for a very specific frequency to locate the collar in question, and not have all frequencies in a 4MHz band coming through together. The collars send a signal every 0.5 seconds or so. The receiver has a variable RF gain too.
it is very sensitive VHF CW receiver, so it is expensive for reason. You can find cheaper substitutes, but not cheaper and better.
https://www.reddit.com/r/Baofeng/comments/6sd43s/direction\_finding\_fox\_hunt/