Installation of a simple 3 section Rohn 25 Tower/mast. tags: shtf wrol prepper preppers prepping survivalist simplex repeater comm comms communication communications ham amateur radio survivalism disaster EMCOMM preparedness
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@bernarrcoletta74195 жыл бұрын
Nice to see you back. You run one of my favorite channels.
@mikemcdonald51475 жыл бұрын
Agreed we need more guerrillacomm videos love learning from you.
@AdamSWL5 жыл бұрын
Great to see you back! Interesting video as always. Thankyou!
@mezamichael5 жыл бұрын
Thanks for the vid. I always look forward to your uploads.
@geekdownrange4 жыл бұрын
Great to see a new video from you. That discone performance is as expected. The discone itself has a lower corner frequency of about 100MHz. The tunable whip and loading coil is what gets you your low-band coverage. They're often rated for only 10-20W at low-band due to the puny size of that loading coil.
@larrybushman15 жыл бұрын
Many thanks great to see you back.
@lakemurrayradio15 жыл бұрын
Good to see you back!
@TexasEngineer2 жыл бұрын
I enjoyed your video. I am a former ROHN Engineer and I have designed many of their towers all over the world and my specialy was the poles. I also used to monitor an old web reflector web site for ham operators and their antennas. One of my biggest complaints about ROHN was their bad information for their 25G wall mounting. The sales people took a drawing for a one particular project and published it for use for every application. Also the ROHN foundation details you mentioned may have been for a free standing guyed ROHN 25G. The base attachment looks like it is on a sidewalk but I can’t tell. Sidewalks are flatwork and are not structural elements so they could never be endorsed. The good news is you only have axial compression and a small shear load at the base. The failure point on your 25G is just above the wall attachment point and most likly in the tower braces. With that said, limit the heigth above the attachment point and the area of the antenna. There are county wind loading requirements that listed in the EIA-TIA-222 that should be part of the local building code. Normally people get a building permit to install a tower especially on a building. The permit would cost more than the tower because of the required structural analysis by an engineer. So now you have issues with a noncompliant tower without a permit and a your insurance does not know about the tower.. What’s the next video going to be about?
@survivalcomms5 жыл бұрын
I have to put up a rohn 25 stick here in the next few weeks. I have been using the same old stainless radio shack discone for over 25 years that has made 3 moves and is still plugging along. I need to squeeze the old Micor cabinet in the new house :) Hope the new place is treating you well. Great to see you putting out content and thanks for sharing !
@RealShipmate5 жыл бұрын
The legend is back!
@n3lee4 жыл бұрын
Good to see you posting again! FWIW: You may get a better response out of the discone with a metal mounting mast; but I can understand using the stationmaster shells (i've done it myself!) Be safe!
@TheTSFChannel5 жыл бұрын
Diggin the groove, bro...!
@towerjokey5 жыл бұрын
Hey your back great to see you.
@GateKommand5 жыл бұрын
Ditto good to see you back Ed mate, please keep the vids coming! I like to use my colinear for 144 and 435 Mhz but I have a Discone ready to erect for general receive, nice and wide band!
@DaveJohnsonad5nm5 жыл бұрын
The 1 cubic yard base in your spec sheet is referring to a freestanding at up to 50'. For your setup with the eve bracket you are still good to 50'. A 24x24x12 pad would have been my preference but you're still good to go.
@zapityzapzap5 жыл бұрын
That 3920 brings back memories...of dislike of Aeroflex monitors. 753 MHz would most likely be something in Band 14. Part 90 starts at 764 MHz.
@survivalcomms5 жыл бұрын
Some first net action for sure
@THESPORTINGCAMP5 жыл бұрын
Welcome back!
@davidboyd7773 Жыл бұрын
I would love to see more videos from you, it has been a while.
@EffTwoFiddy5 жыл бұрын
You're back!
@kd4baoc6124 жыл бұрын
In dealing with Hurricane Dorian this past week here on the south carolina coast, I'm wondering can you do a presentation or video for emergency HF or VHF/UHF antennas that are either self supporting or that can hang from an existing or remaining structure. By the way, I've got the "RADO" and "COMT" currently on my Red Card. Please keep up the good work.
@adamtorgrimson21515 жыл бұрын
Just found one of those towers laying behind one of our stations. Missing the bottom plate. But looks like it's never been used
@cmritchie044 жыл бұрын
I would have liked to see you hookup a Digital TV and do a scan to see what you get... just out of curiosity.
@billmoran38125 жыл бұрын
I think you are confused regarding the signal strength readings you see on the spectrum analyzer. It is not showing return loss. The minus dB scale is showing dB below the reference point. A -13 dB signal is 3 dB weaker than a -10 dB signal. Since 3 dB equates to double the power level, a -10 dB signal is twice the received power than a -13 signal. If you notice, the tower mounted antenna is approximately 3 dB stronger than the roof mounted antenna. So, it is performing much better. Discone antennas are DC grounded, so a metal mast would have been better than a fiberglass one both for better lightning protection and to reduce the noise floor. Without the DC ground to the mast and tower, the coax cable shield becomes part of the antenna and will cause an increase in common mode noise heard at the receiver. To determine return loss during transmit, you would need a vector network analyzer to measure the impedance of the antenna and feedline at the transmit frequency. A mismatch between the transmitter output impedance and the antenna system will result in reflected power loss.
@GUERRILLACOMM5 жыл бұрын
I'm using a return loss bridge not shown. the feed line 1/2 inch superflex outer copper cladding is grounded to the tower at the antenna feedpoint with a grounding kit, just before the fiberglass transition. I was too lazy to convert the return loss reading for signal strength, I would of have to re calibrate my zero reference. I just kept it at the return loss setting and visually seen the difference compared to the live read. Network analyzer would of been nice but I don't have access to one. Would like one to see the connection losses and so forth. I don't get too deep in the details with these videos.
@tonycantrell95475 жыл бұрын
Was wondering how you been.
@WTFSoCal5 жыл бұрын
thanks for the vid man! what are you doing this weekend? camping ??? same spot as last time?
@GUERRILLACOMM5 жыл бұрын
Hey, Thanks man. This year I' getting my house ready for sale, been busy swinging a hammer round here.. Moving north about an hour away.
@mcawrse5 жыл бұрын
Do you think that the newer antenna looks a little worse in some areas is because of less loss in the better coax?
@rickvia84353 жыл бұрын
(don't ask him those type questions - he'll get all nervous)
@JohnTalbot-k6xi5 жыл бұрын
Looking at LTE Upper 700 MHz Band C transmitter on Channel 5259; 753.600 MHz near you. Familiar mask- Good to see you again (!!)
@VanLuciMoret3 жыл бұрын
I got one of these towers, but it has no bracket attached to the house, who could I hire to fix this? (roofer, sidding installers, electrician, etc.)
@Barracuda480825 жыл бұрын
I think a set of radials need adjustment in length and angle for .1 thru 1000 mhz function, and tweak vertical element length .
@gregorybirchfield49525 жыл бұрын
Long time no see.
@Ranchhand3235 жыл бұрын
What kind of band spectrum analyzer are you using ?
@GUERRILLACOMM5 жыл бұрын
Its an Aeroflex 3920. Not mine.
@ericbucklin33824 жыл бұрын
Thanks for the video I enjoyed it, is there a way to reach out to you? Thanks for using a service monitor on your videos I find it really helpful, we have a 8920a at our shop.
@adventure_out_and_travel31494 жыл бұрын
You were saying you can listen to 4 different radios at the same time. But are all 4 able to transmit at the same time?
@GUERRILLACOMM4 жыл бұрын
The quad/tri plexers I think have a 100 watt max power rating. Theoretically if you could tune all those radio to add up below that rating, quite possibly you're able to. Perhaps tune the radios for 20 watts max. I myself have not tried it myself. More detail to come in future videos, I have 3 models of triplexers to showcase.
@James_Bowie5 жыл бұрын
Despite the building bracket, that ground mount is scarily inadequate. Maybe hang some sandbags off the tower a few feet above the ground. What did you use to get the tower and antenna up there -- cherry picker?
@rickvia84353 жыл бұрын
Yeah - a cherry picker, used yer daughter up at the top.
@Vidar.m4 жыл бұрын
Wish i had two towers like that
@rickvia84353 жыл бұрын
Make 1 good one
@dcentral4 жыл бұрын
Don’t they say lightning arrestors should be grounded outside the house/shack and not inside?
@tpcdude5 жыл бұрын
base of tower should have a lightning ground to a buried rod.
@GUERRILLACOMM5 жыл бұрын
Its there after this video. Will mention it on a follow up update when I placed the air vent antenna on its own out rigger on the tower.
@richardruybalid50905 жыл бұрын
What are the connectors used for lightning protection?
@GUERRILLACOMM5 жыл бұрын
This is what we use depending on requirements. www.polyphaser.com/search?Category=RF+Surge+Protectors&sort=y&view_type=grid
@pathopkins45005 жыл бұрын
@@GUERRILLACOMM Great unit =)
@gjnezat5 жыл бұрын
Mounting it on the fiberglass, as opposed to the air vent. Wouldn't have been an electrical ground issue, hence the overall loss?
@survivalcomms5 жыл бұрын
The discone can be insulated from a grounded support structure with no real impact on return loss (I've hung them from trees for temporary use). In a lightning strike things get interesting however.
@gjnezat5 жыл бұрын
@@survivalcomms thanks for the clarification, GC!
@rickvia84353 жыл бұрын
30' w/ building bracing is OK. I'd put a better antenna on it, though. Also good thing you didn't add guide-wires to it - Always insist on the Guy-Wires.
@gjnezat4 жыл бұрын
Does California still use lowband vhf?
@GUERRILLACOMM4 жыл бұрын
Yes, rare, but they're out there.
@Barracuda480825 жыл бұрын
No hinged base plates? Ouch..what you have will work.
@RESlusher5 жыл бұрын
No lock washers on those bolts? Gotta keep an eye on them. Over time your nuts could vibrate loose.
@GUERRILLACOMM5 жыл бұрын
Good eye, I'll rectify that on the next go around. Thanks.
@RESlusher5 жыл бұрын
@@GUERRILLACOMM Glad to see ya back on the KZbins!
@pathopkins45005 жыл бұрын
@@RESlusher Stainless steel ones like the bolts =) Good job all the way through for the height of the tower and antenna =)
@davidgrant27255 жыл бұрын
what kind of watch are you wearing?
@daa34175 жыл бұрын
Looks like a marathon TSAR.
@GUERRILLACOMM5 жыл бұрын
Marathon Medium size diver watch. I think they renamed it Search and Rescue, Mechanical.
@daa34175 жыл бұрын
GUERRILLACOMM Oh it was the mechanical, it looked a lot bigger than 36mm in the video.
@GUERRILLACOMM5 жыл бұрын
@@daa3417 Diameter is 36 mm, but its pretty tall, something like 4 mm give or take, makes it look bigger. That's just my only gripe with it. Guess they had to make the dial deep to accommodate the tritium vials on the hands.
@daa34175 жыл бұрын
GUERRILLACOMM I also think that dial depth is marathon’s thing with their divers, check out Ball watches for what I believe is the brand that does tritium the best out of anyone. I do like the marathon SAR though I’m a big fan of mid size divers if you’ve ever thought about buying an skx013 you should do so now as they’ve been officially discontinued.
@rustyb7823 сағат бұрын
Come back to KZbin!! We miss you!
@GUERRILLACOMM16 сағат бұрын
I really appreciate your vote in confidense. My comeback is in the works.
@rustyb788 минут бұрын
@@GUERRILLACOMM SWEET!!!! I’m sure you’ve been busy, I just miss you and Commsprepper.
@rparker48435 жыл бұрын
I lost my rohn 25g tower a month ago 100foot tower in trees
@GUERRILLACOMM5 жыл бұрын
Ouch, That hurts to hear about. 100 footer is scary to think about toppling over.
@414RadioTech5 жыл бұрын
@GUERRILLACOMM my uncle Johnny Campos was in the Marine Corps also you might have known him anyways hit me up sometime if you have an email address or something send it to me need to get in touch with you ASAP!!!!!!!!!
@nivid013 жыл бұрын
“It’s totally wrong but I am going with it”. Geez, mate, that is no disclaimer it’s an admission of negligence.