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+---- Thread: To All Radio Operators. (/showthread.php?tid=3116)
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RE: To All Radio Operators. - Paul - 1 November 2012
Love the Bazooka aerials.
So easy to make.
I don't encase mine though, just slip a full length piece of heat shrink over the lot.
Means I can coil it for storage.
I've got plenty of trees round me so hauling one into the air isn't a problem.
I don't even bother SWRing them anymore.
Never had a 5/8 one with a SWR of greater than 2:1 EVER.
RE: To All Radio Operators. - Lightspeed - 1 November 2012
(1 November 2012, 16:18)Paul Wrote: Love the Bazooka aerials.
So easy to make.
I don't encase mine though, just slip a full length piece of heat shrink over the lot.
Means I can coil it for storage.
I've got plenty of trees round me so hauling one into the air isn't a problem.
I don't even bother SWRing them anymore.
Never had a 5/8 one with a SWR of greater than 2:1 EVER.
There you are NR:
This'll be a good low cost project, that you should have no problems building, and which will improve the performance of your radio considerably. ( BTW if the item I sent you still has not arrived, please PM me the address again and I'll dispatc a fresh one to you)
Paul, I haven't time to review the You Tube video to see if it was 1/4 wave or 5/8ths. Can you confirm the three critical lengths for a 5/8 version made out of RG58? Maybe start a separate thread for this so that it can be more easily found in future?
RE: To All Radio Operators. - NorthernRaider - 1 November 2012
(1 November 2012, 16:46)Lightspeed Wrote: There you are NR:
This'll be a good low cost project, that you should have no problems building, and which will improve the performance of your radio considerably. ( BTW if the item I sent you still has not arrived, please PM me the address again and I'll dispatc a fresh one to you)
Not to worry LS it really doesnt matter
, radio comms are now in the junk section of my prepping plans, IE something to look at after i have done everything else I want.
RE: To All Radio Operators. - Bug_out_Bag - 1 November 2012
(1 November 2012, 16:18)Paul Wrote: Love the Bazooka aerials.
So easy to make.
I don't encase mine though, just slip a full length piece of heat shrink over the lot.
Means I can coil it for storage.
I've got plenty of trees round me so hauling one into the air isn't a problem.
I don't even bother SWRing them anymore.
Never had a 5/8 one with a SWR of greater than 2:1 EVER.
Exactly what I do Paul, heat shrink! Often 1:1 SWR. I have a few of these already strung up in trees that are left there ready and waiting for when I want to hook up! Of course the plug is cunningly sealed into a tiny plastic tub to keep it dry!
You can't have too many antennas can you? !!!
LS, I'm emailing you a plan for a similar antenna but even easier than the Bazooka, it's a 5'8wave at 2.75m there or there abouts. i can't seem to get the plan to load on here directly! Maybe you can forward it to NR or work some magic and post it here?
BoB
(1 November 2012, 19:26)Bug_out_Bag Wrote:(1 November 2012, 16:18)Paul Wrote: Love the Bazooka aerials.
So easy to make.
I don't encase mine though, just slip a full length piece of heat shrink over the lot.
Means I can coil it for storage.
I've got plenty of trees round me so hauling one into the air isn't a problem.
I don't even bother SWRing them anymore.
Never had a 5/8 one with a SWR of greater than 2:1 EVER.
Exactly what I do Paul, heat shrink! Often 1:1 SWR. I have a few of these already strung up in trees that are left there ready and waiting for when I want to hook up! Of course the plug is cunningly sealed into a tiny plastic tub to keep it dry!
You can't have too many antennas can you? !!!
LS, I'm emailing you a plan for a similar antenna but even easier than the
Bazooka, it's a 5'8wave at 5.25m there or there abouts. i can't seem to get the
plan to load on here directly! Maybe you can forward it to NR or work some magic
and post it here?
BoB
Oops sorry, I seem to have buggered up the thread by trying to correct the measurement in a previous post
oops sorry
RE: To All Radio Operators. - Paul - 1 November 2012
Paul, I haven't time to review the You Tube video to see if it was 1/4 wave or 5/8ths. Can you confirm the three critical lengths for a 5/8 version made out of RG58? Maybe start a separate thread for this so that it can be more easily found in future?
[/quote]
And just for you LS
Basic Calculations for 1/2 wave bazooka.
Center freq use 27.6 to allow Euro and UK use.
For UK use 27.9
VF for common coax
RG58 poly and rg8 poly 0.66
RG8X 0.78
Calcs for 1/2 wave:
OL= 15000/center freq in mhz
answer in cms
LS= VF * (7500/center freq in Mhz)
answer in cms
TS= OL-LS in cms
1/2 wave calcs for RG58:
Overall length 543 cm (Mine 540)
Lower section 179 cm (Mine 180)
Top section should be 364 cm
But I always find it too long and trim back.
Mine is always cut to 360 cm for optimal UK use.
Not perfect but close enough.
CAUTION, don't use over 75 watts through RG58.
Things will start to glow in the amp if you don't SWR in better than 1.3:1
I don't think it's worth starting a new thread LS, the take up won't be that much.
For any bacon reading this.
The calcs work right the way through HF to VHF BUT over 300Mhz everything gets "twitchy" if you are slinging this style of aerial into a tree. In other words you'll need to use a combined SWR/ATU box. That'll teach you to play with high numbers.
RE: To All Radio Operators. - Lightspeed - 2 November 2012
(1 November 2012, 19:26)Bug_out_Bag Wrote:(1 November 2012, 16:18)Paul Wrote: Love the Bazooka aerials.
So easy to make.
I don't encase mine though, just slip a full length piece of heat shrink over the lot.
Means I can coil it for storage.
I've got plenty of trees round me so hauling one into the air isn't a problem.
I don't even bother SWRing them anymore.
Never had a 5/8 one with a SWR of greater than 2:1 EVER.
Hi Bob,
No PM received from you??
Exactly what I do Paul, heat shrink! Often 1:1 SWR. I have a few of these already strung up in trees that are left there ready and waiting for when I want to hook up! Of course the plug is cunningly sealed into a tiny plastic tub to keep it dry!
You can't have too many antennas can you? !!!
LS, I'm emailing you a plan for a similar antenna but even easier than the Bazooka, it's a 5'8wave at 2.75m there or there abouts. i can't seem to get the plan to load on here directly! Maybe you can forward it to NR or work some magic and post it here?
BoB
(1 November 2012, 19:26)Bug_out_Bag Wrote:(1 November 2012, 16:18)Paul Wrote: Love the Bazooka aerials.
So easy to make.
I don't encase mine though, just slip a full length piece of heat shrink over the lot.
Means I can coil it for storage.
I've got plenty of trees round me so hauling one into the air isn't a problem.
I don't even bother SWRing them anymore.
Never had a 5/8 one with a SWR of greater than 2:1 EVER.
Exactly what I do Paul, heat shrink! Often 1:1 SWR. I have a few of these already strung up in trees that are left there ready and waiting for when I want to hook up! Of course the plug is cunningly sealed into a tiny plastic tub to keep it dry!
You can't have too many antennas can you? !!!
LS, I'm emailing you a plan for a similar antenna but even easier than the
Bazooka, it's a 5'8wave at 5.25m there or there abouts. i can't seem to get the
plan to load on here directly! Maybe you can forward it to NR or work some magic
and post it here?
BoB
Oops sorry, I seem to have buggered up the thread by trying to correct the measurement in a previous post
(1 November 2012, 23:28)Paul Wrote: Paul, I haven't time to review the You Tube video to see if it was 1/4 wave or 5/8ths. Can you confirm the three critical lengths for a 5/8 version made out of RG58? Maybe start a separate thread for this so that it can be more easily found in future?
And just for you LS
Basic Calculations for 1/2 wave bazooka.
Center freq use 27.6 to allow Euro and UK use.
For UK use 27.9
VF for common coax
RG58 poly and rg8 poly 0.66
RG8X 0.78
Calcs for 1/2 wave:
OL= 15000/center freq in mhz
answer in cms
LS= VF * (7500/center freq in Mhz)
answer in cms
TS= OL-LS in cms
1/2 wave calcs for RG58:
Overall length 543 cm (Mine 540)
Lower section 179 cm (Mine 180)
Top section should be 364 cm
But I always find it too long and trim back.
Mine is always cut to 360 cm for optimal UK use.
Not perfect but close enough.
CAUTION, don't use over 75 watts through RG58.
Things will start to glow in the amp if you don't SWR in better than 1.3:1
I don't think it's worth starting a new thread LS, the take up won't be that much.
For any bacon reading this.
The calcs work right the way through HF to VHF BUT over 300Mhz everything gets "twitchy" if you are slinging this style of aerial into a tree. In other words you'll need to use a combined SWR/ATU box. That'll teach you to play with high numbers.
[/quote]
Nice one Paul.
Thanks for this.
RE BACON....I will remember not to play with high numbers!