I tested the antenna with my nanoVNA and got similar results. Just curious why so good since the coax is 50 ohm but I believe the antenna impedance is 72 ohm. Also unbalanced coax feeding a balanced antenna. From what I have read, people are saying that this doesn't matter as much for a receiving antenna but more critical for transmitting.
Hey Adam, I've built a v-dipole using your plans (with the only difference being that I'm using 75ohm coax) and I have a problem. I orient my antenna north/south as mentioned in the plans and this video however I keep having to rotate my antenna throughout the pass to get a good signal. Do you know why this is and how I can fix it? Thanks!
I'm using 75 ohm RG-6 coax, does that mean I shouldn't bend dipole into V shape since normal dipole has around 73 ohms of impedance? Koristim 75-omski RG-6 koaksijalni kabli. Da li to znači da ne treba da savijem žice antene u oblik slova V pošto obična, nesavijena, dipol antena ima impedansu oko 73 oma?
I modeled the horizontal v antenna using the EZNEC software. It shows that the VSWR if the source (and cable) is 50 ohms is about 1.5. If the source is 75 ohms it is a bit better at 1.3. So it doesn't seem to make much difference with the impedance of the cable. Also, the radiation pattern of the horizontal V is a lobe to the side, but a very large lobe upwards in a circle. The radiation pattern of a dipole is much more to the sides than upward. That's why the v dipole is particularly suitable for satellites and pointing it north or south doesn't much matter (for satellites traveling in a polar orbit).
@@mihajlopetkovic2003 I just received a nanoVNA so that I can test my actual antenna. Performance is even better, like Adam shows in this video. SWR of 1.2 with my 50 ohm coax.
Hello Adam ? Would this V dipole also be a good choice for ADS-B reception (with each leg being 7cm long of course) ? I'm also thinking of this kind of V dipole for AirScatter reception on VHF/UHF. What do you think ? Thanks.
Glad to see someone doing the same, i read about baluns but when i first made my horizontal dipole i didn't out one and it worked well for receiving
Thanks for posting!
I tested the antenna with my nanoVNA and got similar results. Just curious why so good since the coax is 50 ohm but I believe the antenna impedance is 72 ohm. Also unbalanced coax feeding a balanced antenna. From what I have read, people are saying that this doesn't matter as much for a receiving antenna but more critical for transmitting.
How come the Croatia Microwave blog hasn't been updated in so long?
Hey Adam, I've built a v-dipole using your plans (with the only difference being that I'm using 75ohm coax) and I have a problem. I orient my antenna north/south as mentioned in the plans and this video however I keep having to rotate my antenna throughout the pass to get a good signal. Do you know why this is and how I can fix it? Thanks!
doppler effect?
I'm using 75 ohm RG-6 coax, does that mean I shouldn't bend dipole into V shape since normal dipole has around 73 ohms of impedance?
Koristim 75-omski RG-6 koaksijalni kabli. Da li to znači da ne treba da savijem žice antene u oblik slova V pošto obična, nesavijena, dipol antena ima impedansu oko 73 oma?
I modeled the horizontal v antenna using the EZNEC software. It shows that the VSWR if the source (and cable) is 50 ohms is about 1.5. If the source is 75 ohms it is a bit better at 1.3. So it doesn't seem to make much difference with the impedance of the cable.
Also, the radiation pattern of the horizontal V is a lobe to the side, but a very large lobe upwards in a circle. The radiation pattern of a dipole is much more to the sides than upward. That's why the v dipole is particularly suitable for satellites and pointing it north or south doesn't much matter (for satellites traveling in a polar orbit).
So in summary, you need to use the V shape
@@mirskym Thank you!
@@mihajlopetkovic2003 I just received a nanoVNA so that I can test my actual antenna. Performance is even better, like Adam shows in this video. SWR of 1.2 with my 50 ohm coax.
And my coax is RG8 which is 50 ohms. So OK even with mismatch of feedline and antenna impedances!
Hello Adam ? Would this V dipole also be a good choice for ADS-B reception (with each leg being 7cm long of course) ? I'm also thinking of this kind of V dipole for AirScatter reception on VHF/UHF. What do you think ? Thanks.
Try it.
@@heikosoeder Helpful reply. Thank you so much.