Hello everyone, I am a new member and this is my first post; I do hope it is located correctly, and trust the moderators will adjust as needed.
First, what a fantastic website! So many resources, shared by people genuinely interested and helpful.
I have NO electical background, have successfully built high performance automotive engines, in particular cylinder heads and specialised in modifying carburetors extensively in a previous life, but... electrically speaking I am about at the level of flaslights and wall switches for household lighting.
To date I have built some 2.4Ghz "cantennas" that have worked very well. I use these for WiFi around the house and is now my "hobby". My "testing" is nothing more than simple observation ie. did it provide results as expected, and is the signal (observed through computer software such as InSSIDer, Vistumbler and others) steady and without a lot of fluctuations or drop outs - answer "yes" to both criteria.
Recently I decided to create a pair of waveguide antennas to use with a USB wireless adapter that has two non-removable antennas on it as delivered, the co-axial cables for each soldered directly to the PCB. My plan was to create a waveguide "cantenna" for each existing antenna and solder the new cables the same way to the PCB since I have seen this done succesfully on YT videos. The "cans" are typical food type so were separate from each other, however I wanted to add a "horn" to the front of each can for a bit of added gain and in this case for appearance reasons and this is what had me wondering about the electrical properties that I admit I do not fully understand. The "horns" I opted for were something found in a store and were *already spot welded together* but looked like they would mate nicely to my food cans.
It's all assembled now, working and painted. In total there are four antennas now because this was to be used at a family members trailer where wifi is available but distant. The goal was to use the directional feature of the cantennas to tx/rx and use the smaller original antennas to distrbute signal around the premises. This is done either with software or within the operating system. The directional feature of my new device seems to work and provide some extra gain but evry so often will drop for a second or two then go back to a fairly steady rate varying only about 1-2dB. Nearby signals NOT aimed at by the cantennas are up and down almost always and vary by about 5-10 dB. This is unlike my other cantennas where signal varied extremely little, near or far.
I have purchased some USB wireless adapters that were manufactured with two replacable antennas and on those the "ground" (threaded portion of RP-SMA connectors) show electrical continuity on all the ones I tested. Using a pair of replacable cantennas attached with RP-SMA connector on THESE adapters I do not get fluctuations or anything unexpected.
Since I have this painted and assembled now, and reeeeeeeally don't want to cut and hack if not truly neccessary. I'm trying to get information about "tuning rods" because that will be something I'd like to learn about, is possibly an easy feature to add, and could possibly minimise or eliminate the problem - any suggestions appreciated.
QUESTION: Does the spot welded "horns" cause an electrical problem and maybe excessive VSWR or other undesirable result, and should they be separated?
ps - if necessary I can provide specs and a photo but generally this is two "cantennas" with recommended dimensions and materials, the co-ax cable from the cantennas to the PCB is (shamefully) RG-174/U because that's what I have plenty of
First, what a fantastic website! So many resources, shared by people genuinely interested and helpful.
I have NO electical background, have successfully built high performance automotive engines, in particular cylinder heads and specialised in modifying carburetors extensively in a previous life, but... electrically speaking I am about at the level of flaslights and wall switches for household lighting.
To date I have built some 2.4Ghz "cantennas" that have worked very well. I use these for WiFi around the house and is now my "hobby". My "testing" is nothing more than simple observation ie. did it provide results as expected, and is the signal (observed through computer software such as InSSIDer, Vistumbler and others) steady and without a lot of fluctuations or drop outs - answer "yes" to both criteria.
Recently I decided to create a pair of waveguide antennas to use with a USB wireless adapter that has two non-removable antennas on it as delivered, the co-axial cables for each soldered directly to the PCB. My plan was to create a waveguide "cantenna" for each existing antenna and solder the new cables the same way to the PCB since I have seen this done succesfully on YT videos. The "cans" are typical food type so were separate from each other, however I wanted to add a "horn" to the front of each can for a bit of added gain and in this case for appearance reasons and this is what had me wondering about the electrical properties that I admit I do not fully understand. The "horns" I opted for were something found in a store and were *already spot welded together* but looked like they would mate nicely to my food cans.
It's all assembled now, working and painted. In total there are four antennas now because this was to be used at a family members trailer where wifi is available but distant. The goal was to use the directional feature of the cantennas to tx/rx and use the smaller original antennas to distrbute signal around the premises. This is done either with software or within the operating system. The directional feature of my new device seems to work and provide some extra gain but evry so often will drop for a second or two then go back to a fairly steady rate varying only about 1-2dB. Nearby signals NOT aimed at by the cantennas are up and down almost always and vary by about 5-10 dB. This is unlike my other cantennas where signal varied extremely little, near or far.
I have purchased some USB wireless adapters that were manufactured with two replacable antennas and on those the "ground" (threaded portion of RP-SMA connectors) show electrical continuity on all the ones I tested. Using a pair of replacable cantennas attached with RP-SMA connector on THESE adapters I do not get fluctuations or anything unexpected.
Since I have this painted and assembled now, and reeeeeeeally don't want to cut and hack if not truly neccessary. I'm trying to get information about "tuning rods" because that will be something I'd like to learn about, is possibly an easy feature to add, and could possibly minimise or eliminate the problem - any suggestions appreciated.
QUESTION: Does the spot welded "horns" cause an electrical problem and maybe excessive VSWR or other undesirable result, and should they be separated?
ps - if necessary I can provide specs and a photo but generally this is two "cantennas" with recommended dimensions and materials, the co-ax cable from the cantennas to the PCB is (shamefully) RG-174/U because that's what I have plenty of