Uploaded June 2023 | Updated September 2026, 2 weeks ago
I'm testing a RUSH Tank MAX Solo VTX and I like it mainly because it has this tiny fan that somehow keeps it from getting hot. Out of basically all the higher powered 5.8g VTX's I like this one the best. It comes with a dedicated audio input I ran an electret board to and it will also automatically start at low power without using a FC. That keeps me from accidentally blasting too much power just going around my living room. I prefer this over something with Smart Audio or even a built in mic because the gain is just too low on those and meant for things with props. As usual it sounds too loud in the DVR recording but sounds great to me from headphones. The VTX uses an MMCX connector so I had to put an adapter on it to use the Double AXII 2 antenna. The receiver I'm using is not ideal and largely part of why I'm getting so much noise, but the noise is also what I've been trying to figure out ever since I started messing with this. Something was just never quite right and I still don't know what it is. Even my Crossfire control on 3 different receivers has a really hard time in a lot of little 'pockets' around my area. I tried some band pass filters and found one which did work a little bit but I could only find the one, and the receiver uses two antennas.
I replaced a bad relay and added a buttload of filtering on the RC car portion which uses its own battery, and then a little bit on the VTX portion which uses its own battery. The cam is also supplied from the 5v VTX output which is recommended if you can use it. I don't really need the range of Crossfire but I decided to use it on this car because it gives me less interference than my 2.4g control did on the channels I was trying to use. The remaining noise in let's say the places I don't think it should exist can sometimes be from the Crossfire TX changing its dynamic power output briefly before settling back down again. IDK what all that other stuff is. If I drive around inside a fairly large commercial building I don't seem to get as much noise... could still just be all the wifi. I'm always in my living room with these tests so close range it's always having to penetrate sub floor and probably walls, but with decent LOS this setup will go pretty far.
There comes a sharp point in the pipe where the video gets too bad and I would guess this is less due to the 5.8g VTX+VRX being incapable of the penetration, and more due to the Crossfire TX changing its dynamic output to 500mW or higher. When Crossfire starts outputting that much power it can basically step all over nearby systems. I see it in the 1.3g and the 5.8g. Nothing is really going to filter that out so you'd have to basically keep them separated by some tens of feet probably. In this regard, I would say the Crossfire diversity receiver is going to be the better choice all around for long range or high penetration traveling. It should not need to use so much high power as often.
I'm testing a RUSH Tank MAX Solo VTX and I like it mainly because it has this tiny fan that somehow keeps it from getting hot. Out of basically all the higher powered 5.8g VTX's I like this one the best. It comes with a dedicated audio input I ran an electret board to and it will also automatically start at low power without using a FC. That keeps me from accidentally blasting too much power just going around my living room. I prefer this over something with Smart Audio or even a built in mic because the gain is just too low on those and meant for things with props. As usual it sounds too loud in the DVR recording but sounds great to me from headphones. The VTX uses an MMCX connector so I had to put an adapter on it to use the Double AXII 2 antenna. The receiver I'm using is not ideal and largely part of why I'm getting so much noise, but the noise is also what I've been trying to figure out ever since I started messing with this. Something was just never quite right and I still don't know what it is. Even my Crossfire control on 3 different receivers has a really hard time in a lot of little 'pockets' around my area. I tried some band pass filters and found one which did work a little bit but I could only find the one, and the receiver uses two antennas.
I replaced a bad relay and added a buttload of filtering on the RC car portion which uses its own battery, and then a little bit on the VTX portion which uses its own battery. The cam is also supplied from the 5v VTX output which is recommended if you can use it. I don't really need the range of Crossfire but I decided to use it on this car because it gives me less interference than my 2.4g control did on the channels I was trying to use. The remaining noise in let's say the places I don't think it should exist can sometimes be from the Crossfire TX changing its dynamic power output briefly before settling back down again. IDK what all that other stuff is. If I drive around inside a fairly large commercial building I don't seem to get as much noise... could still just be all the wifi. I'm always in my living room with these tests so close range it's always having to penetrate sub floor and probably walls, but with decent LOS this setup will go pretty far.
There comes a sharp point in the pipe where the video gets too bad and I would guess this is less due to the 5.8g VTX+VRX being incapable of the penetration, and more due to the Crossfire TX changing its dynamic output to 500mW or higher. When Crossfire starts outputting that much power it can basically step all over nearby systems. I see it in the 1.3g and the 5.8g. Nothing is really going to filter that out so you'd have to basically keep them separated by some tens of feet probably. In this regard, I would say the Crossfire diversity receiver is going to be the better choice all around for long range or high penetration traveling. It should not need to use so much high power as often.
