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| My latest creation for the Magic band | |
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| Tweet Topic Started: Saturday, 6. August 2011, 12:15 (1,014 Views) | |
| Deleted User | Saturday, 6. August 2011, 12:15 Post #1 |
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I've been playing with my Avanti PDL2 the past few days, learnt a lot and finally tuned and matched it to 6m. Details of the tune and match can be viewd via the pdf. cheers, adonis
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| MadMark1 | Saturday, 6. August 2011, 13:20 Post #2 |
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163 Charlie Tango 020
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Hi Ellis, The antenna looks quite tidy , let me know how you get on with it and what its performance is like, Ive been building a criss-cross 3 element yagi for 6 mtrs , , 3 elements horizontal and 3 vertical, twin gamma matchers, Its not finished yet bit its not far of.73 de Mark |
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Gw0wvl http://www.qrz.com/db/GW0WVL Facebook https://www.facebook.com/groups/1568501233420524/ My Youtube site ... http://www.youtube.com/MrMadjones My website ... http://mjmotorbikes.weebly.com/ My Radio website http://gw0wvl.weebly.com/ "It's not the class of license that the Amateur holds but the class of Amateur that holds the license" | |
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| Deleted User | Saturday, 6. August 2011, 16:34 Post #3 |
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Hi Marc, Will do. I hope to have it up in the air in about a week or so. Your beastie sounds really nice. Be nice to compare notes in a few months or so. cheers, adonis |
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| Deleted User | Thursday, 11. August 2011, 08:44 Post #4 |
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I managed to put my PDL2 (Polar Diversity Loop, 2 element) for 6m yesterday. Before sticking it on the mast I checked the VSWR etc. and managed to swr it in fairly close to its point of resonance at mid-band 51.00 MHz. Complex impedance readings were R=51 X=j4 for both polarisations. I then had to shoe-horn it onto the mast (see image below) and part of the PDL2 RF field is within the yagi above it. There is some interaction between the two antennas because when I key up on 6m I get interference on my 2m rig. For whatever reason, the magnetic component of the PDL2 is very strong (meaning it should work OK) and at some stage I will need to put a longer stub mast to get some separation between the two. The VSWR across the 6m band +-1.5 is almost flat with the VSWR rising to 1.5 near the band edges. Job done and well happy. cheers, adonis ![]() |
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| Deleted User | Thursday, 11. August 2011, 08:52 Post #5 |
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The fun bit starts and I need to see whether it works or not. I have a couple of 6m beacons here in Greece and I will compare signal strengths (comparative) between the PDL2 and my hexbeam which also has a 6m 2 element wires capability. Whilst I am playing with these antennas I need to start thinking about winter DX and putting something up for 80m and 40m cheers, adonis |
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| MadMark1 | Thursday, 11. August 2011, 18:27 Post #6 |
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163 Charlie Tango 020
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It looks really good Ellis, Its turned out well ... Mark |
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Gw0wvl http://www.qrz.com/db/GW0WVL Facebook https://www.facebook.com/groups/1568501233420524/ My Youtube site ... http://www.youtube.com/MrMadjones My website ... http://mjmotorbikes.weebly.com/ My Radio website http://gw0wvl.weebly.com/ "It's not the class of license that the Amateur holds but the class of Amateur that holds the license" | |
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| Deleted User | Thursday, 18. August 2011, 10:56 Post #7 |
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I've had my 6m PDL2 up for a few weeks and thought I would update on its performance. Basically, the band is quiet apart from a local beacon, SV1SIX located in Athens. Info on the nets says it uses a turnstile antenna (30w transmitter output) and I am assuming its horizontally polarised. So, using the beacon as a reference signal I just wanted to see whether the PDL2 works as it should and it went head to head performance-wise with my G3TXQ-tuned hexbeam. Signal strengths for both antennas (horizontal polarisation) were similar at S8.5 for the PDL2 and S8 for the hex. Signal strength for the vertical bit of the PDL2 was S8. I swung both beams 180 degrees and the signal strength for the PDL2 (horizontal) was 4.5, the hex was S7. Signal strength for the vertical bit of the PDL2 was 5. Conclusions: the horizontal bit of the PDL2 works as well as the hexbeam and I am happy with that. The front to back ratio guesstimates (assuming a 6dB per signal point) is in the ball park of between 18 dB - 24 dB for either PDL2 polarisation. I'm happy I have'nt built a dummy load when I re-scaled the 11m PDL2 to the 6m version but this quick and dirty test has raised more questions than answers. 1. The absolute differences in signal strength between the front to back of the hex is puzzling, I wold expect the front to back ratio to be a bit higher. 2. The complicating thing is I do not know how the beacon turnstile antenna is mounted. If its mounted horizontally it has a more or less omnidirectional radiation pattern. If its mounted vertically, its polarisation is cross polarised and directional. 3. I am still a bit confused on the propagation for 6m, is it more aligned to VHF or is it similar to 10m cheers, adonis |
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| Listener | Thursday, 18. August 2011, 15:04 Post #8 |
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Take a look at the UK 6 meter group. They have lots of info on there. http://uksmg.org/news.php 6 meters is a strange band in that it has all the propagation that both VHF & HF gets, even the MUF can reach as high as 50MHz, although not very often. So it's aligned with both. Tropospheric propagation, (Tropo.) Tropospheric ducting, (Extended Tropo) & Sporadic E are all available on 6 at various times as are Meteor Scatter & inversion, I think it's called, where fog causes low temperatures closer to the ground, causing signals to refract like a stick in water & the signal thus to travel further. More info at http://www.uksmg.org/content/Investigation.htm |
| The biggest advance in radio technology EVER, was the invention of the credit card. | |
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| Listener | Thursday, 18. August 2011, 15:10 Post #9 |
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I forgot to add, if you are using a amateur radio for your S meter readings, many have a 1dB gain per s point up to S9. http://www.seed-solutions.com/gregordy/Amateur%20Radio/Experimentation/SMeterBlues.htm |
| The biggest advance in radio technology EVER, was the invention of the credit card. | |
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| Deleted User | Thursday, 18. August 2011, 17:21 Post #10 |
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Hi Listener, Thanks for the link to the 6m group, I'll join that and do lots of reading. I guess I also need to know when the various contests etc. are taking place in order to gauge band activity and how well (or not) my antenna is doing. The other link you sent on the caibration of signal strength meters is really good and answered a lot of questions I'd not even thought about asking. I assumed (wrongly) that each signal point across the whole of the signal meter scale is more or less calibrated relative to the one before so that by the time you reach S9 it gives a measure of cumulative strength. Great stuff. I used an FT-2000 for my comparative signal strengths between the two antennas but I'll have to look at the AGC /signal meter circuit to see where it draws its voltages from. I think maybe this a question for the Ft-2000 gurus yahoo group because like most rigs today it has an IPO circuit with a two stage preamp and someone on there must have the calibrated gear to rovide some data. |
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| BigTone | Wednesday, 26. October 2011, 00:25 Post #11 |
26 Charlie Tango 4498
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Ellis, the reason for 6 metres breaking through on 2 is simple , 3rd harmonic (near enough) I do the UK Activity Contests on a Tuesday night and a 6 metre dipole works fine and dandy on 2 |
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6m_pdl2.pdf (345.45 KB)

, let me know how you get on with it and what its performance is like, Ive been building a criss-cross 3 element yagi for 6 mtrs , , 3 elements horizontal and 3 vertical, twin gamma matchers, Its not finished yet bit its not far of.



1:03 AM Jul 11