Dual Band Ham
Dual Band Ham
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Reverse SMA to PL-259 Adapter Cable - Female/Female for Wouxun $14.99 This Cable accepts a PL-259 from Base/Mobile antennas, & adapts it to the Male"SMA" style jack found on Wouxun, Linton & other 'reverse sma' Two Way radios & Amateur Radio handhelds. (see closeup of SMA on cable) Not for Yaesu, Alinco, Icom or Kenwood Ham Radios (see other version). Fits Wouxon KG-UVD series of Handheld radios, & others wth "pin in radio" sma jacks.... |
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USB Programming Software & Cable for Yaesu FT-8800R $49.99 PC Programming software with USB cable for the Yaesu FT-8800R Amateur Ham radio.... |
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Midland XT511 22-Channel FRS/GMRS Two-Way Emergency Crank Radio $89.99 The Midland Base Camp Radio combines the emergency power of a Dynamo Crank with GMRS 2-way radio technology. The XT511 includes AM/FM radio, All Hazards Weather Alert radio, clock with alarm and an LED flashlight to make it the most versatile product of its kind. Ideal for hiking or camping enthusiasts because of its precautionary tool for any emergency situation. The 2-way radio lets users commun... |
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Midland 75-822 40 Channel CB-Way Radio $119.99 Handheld Mobile CB w/ Adapter. - Midland handlheld mobile CB with adapter- Lightweight handheld CB radio that can be easily converted to a mobile CB- For portable: insert batteries into battery pack and attach flexible antenna- For mobile: replace the battery pack with the silde-on auto adapter, plug into your vehicle's cigarette lighter and attach an external antenna- Squelch control- On/off volu... |
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NEW BAOFENG UV-5R VHF/ UHF DUAL-BAND TWO WAY RADIO $62.95 This BAOFENG UV-5R transceiver is a micro-miniature multiband FM transceiver with extensive receive frequency coverage, providing local-area two-way amateur communications along with unmatched monitoring capability. Frequency Range: 65-108MHz(FM Receive only) 136-174MHZ and 400-480HZ (TX/RX) |
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Handheld VHF & 2 Meter Amateur Radio Tranceiver 5watt, TYT TH-F5 Ham Radio $78.50 VHF & 2 meter Handheld 5W transceiver, 136-174Mhz . Direct Keypad Freq & function entry. 128 AlphaNumeric memory channels, Scan modes, PL & DPL (ctcss/dcs), selectable step rates & repeater shift. Has regular Amateur SMA antenna jack, & a "Kenwood Style" 2-pin speakermike jack, for compatibility w/ many aftermarket accessories. Optional PC programming cable available.. 5W / 2W / 1W Output setti... |
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Quad-Band Yaesu VX-8DR Submersible VHF/UHF Amateur Radio Transceiver $510.00 The Yaesu VX-8DR is the ultimate HandHeld transceiver for Amateur radio use!Transmits on 4 Ham radio bands (50-54Mhz Six meter, 144-148Mhz Two meter, 222-225Mhz 1.25M, 430-450Mhz 70cm), & receives 0.5-999Mhz. With the optional FGPS-2 GPS module sold seperate, the radio is fully ready for APRS. Ready to go package Includes Wall charger, 1100ma LioN battery, antenna & belt clip. Other Optional avai... |
Can you enclose an antenna inside PVC pipe?
I am a ham radio operator and want to build antennas for the 2m, 1.25m, and the 70cm bands that I could stick on the top of my house. I currently just a have a handy talky with a dual 2m/70cm whip antenna. I want to build an antenna that kind of looks like an upside down "Y" with four radials.
To mount it on my house, I would like to make a stand like this picture:
http://www.ccars.org/photos/Projects/2%20Meter%20PA%20Final.jpg
out of PVC pipe. Could I cover the vertical parts (the driven element) with PVC pipe to avoid water damage, or will I just need to take it down when it begins to rain?
Can you cover the transmitting part of any antenna with PVC pipe? I'm still new to antenna theory so if you could explain what you are talking about about but also use the proper terms, that would be amazing.
The goal would be to have the antenna be completely sealed inside PVC pipe, just so it would stay better longer. Would the PVC affect the radiation pattern/give higher losses?
Hi there
Ham radio is a hobby that is much more than just talking to people.
The greatest part of the hobby is the technical experimentation and self learning.
So why not make tests yourself and PROVE what works and what doesn't......
I can easily tell you the answer , but you wont learn from that ,. but you will learn from conducting tests.
Find a sample of the PVC tube that you plan to use in this project.
Place it in a microwave over and set it on high.
Cook the tube for 1 minute.
Then open the oven and see if the tube is hot.
If it is , then it has been reacting to RF and its not suitable for an antenna cover , if it is cool RF has passed through it with no resistance , and is suitable for your project.
Now get another piece that is long enough to cover your existing HT antenna.
Make a QSO with another station on simplex with the tube covering the whip.
Then remove the tube and try again , asking the RX station did the other station notice any difference in signal strength ?.
If the tube had passed the microwave test , then you should find that in the second field strength test that the tube is also passed good.
''--as it can attenuate the signal when wet; particularly when dirty & wet.''
You can also try simulating water and dirt on the tube by again comparing signal strengths.
You will of course have to put water and dirt on the HT antenna too ,,and test it that way , so as to make the addition of the tube the only variable in the experiment.
Again I could tell you the answers , but that would deprive you of the best part of the hobby, education.
PS , A hint....Microwave transmitting dishes use covers called radomes that are made from plastics or fiberglasses.
As to your plan to cover the antenna with the PVC tube it is not without merit.
It only takes 3 or 4 years of sunlight to break down the heat-shrink tubing that covers most mobile whips.
A PVC tube cover will certainly slow that down., but is it worth it. ?
Most Hams revise their antenna systems regularly in the search of performance , so trying to make an antenna last a very long time may not bring a huge advantage , and perhaps not worth the cost or time that it takes to protect it.