Posts Tagged ‘amateurradio.com’

My #POTA Pickle, or How I Learned to Stop Worrying and Love the ARRL #DX Contest

Sunday March 4th was a beautiful and slightly cool (mid-seventies) day in Jupiter, Florida and was the day I selected for my first #POTA activation (parksontheair.com).  I picked the 11,000 acre Jonathan Dickinson State Park, KFF-1887, just six m20180304_103921.jpgiles from my Florida QTH.  I scouted out locations a few days earlier and chose the picnic area near the river, with cooperating pine trees with handy limbs.  Using my unique antenna launch tool (see pic) on only the second try I hit my target limb and hoisted the “high” end of an EndFedz antenna cut for 20 meters.  My battery was charged, I had my sandwich, I even had a cushion for the hard picnic table bench seat.  Right on time I was ready to spot myself, all settled and happy.  Do you hear a “but” coming?

This was 20180304_112008.jpgalso the weekend ARRL chose, without checking with me, for their hugely popular annual DX Contest.  There were a few thousand hams on 20m, most, it seemed, with a kilowatt and a pretty good beam competing with me barefoot with a dipole up all of fifteen feet.   I spotted myself on DXSummit.fi but apparently nobody cared.  I raised my friend Rick on the local repeater and got him to listen for me at 14.244 a few miles away and we could barely hear one another on ground wave.  We were in a wall of sound (and I was learning the value of a filter for sideband.)

So there’s my POTA Pickle; I’m in the right place and all set to operate POTA but cannot compete with a thousand big gun stations.  Well  golly, let’s join in on the fun then.

First I took down the End Fedz that just doesn’t work that well for me and put up my link dipole made from lamp cord and began to hunt and pounce.  Worked a dozen international stations in an hour and called it, after all, a good non-POTA day.

This is Wayne,  K4WK, http://www.hamdom.com. Thanks for listening; you’re in the log.

 

Review – BTech AMP-25 series for Analog & DMR

by John ‘Miklor’
K3NXU

The  AMP-25  series  VHF / UHF Amplifiers

The recently announced BTech Digital and Analog amplifier series puts a whole new spin on mobile operation. It performs more like a mobile than it does a power amp. The D series are true TDMA Tier2 DMR amplifiers.

Note: This review was done using an Anytone D868UV on both DMR and analog.

In the Box

Included with the 40W Mobile Amp are:

–  Mounting Bracket
–  3′  Interface Control Cable (Kenwood K1 connectors)
–  3′  RF connect cable (SMA-M to SMA-F)
–  Microphone and Hanger
–  All necessary mounting hardware
–  User Guide

General Description
–  UHF or VHF Power Amplifier

–  2-6W  >  20-40W  Output

                         Modes of operation include:

             V25  U25            V25D   U25D
Analog (FM)
C4FM (Fusion)
P25  (Phase 1)
NXDN
IDAS
dPMR
MPT1327
 >  DMR Tier II (TDMA)
 >  P25  (Phase 2)
Analog (FM)
C4FM (Fusion)
P25  (Phase 1)
NXDN
IDAS
dPMR
MPT1327

A Different type of Mobile Amplifier

I found these to be much more than a typical power amplifier. Although they can function as a simple ‘In and Out’ power amp, this is about as close to a full mobile as you can get. Although the driving force was my DMR handheld sitting in my cup holder, the transmit audio was that of the included hand microphone and the receiver audio out was coming through the built in speaker driven by a four watt audio amplifier.

Transmit Power

I tested the power on two different models. The VHF V25 (non TDMA) and the U25D for UHF DMR.  The power was tested using the analog side of both into a calibrated Bird Termaline wattmeter. The maximum current drain from my 13.6V 30A power supply was just under 6A. This is low enough for the amp to be powered by the 10A accessory jack in your vehicle.

Enclosure

The basic frame measures 4.6″W x 1.3″H x 5.5″D (excluding the SO-239) and weighs in at 26oz.  I was curious to see the internal layout of the amp and to no surprise, there was a 5/8″ finned heat sink spanning the entire length and width of the case along with air vent along the back of the enclosure.

Operating Modes

These are single band amplifiers.
V25(D) = VHF 136-174MHz
U25(D) = UHF 400-480MHz.

Note: The V25D and U25D were designed to include DMR Tier II (TDMA) and P25 Phase 2 along with all other modes. Their operation varies slightly.

V25  /  U25
To operate VHF through the UHF (U25) amplifier, or UHF through the VHF (V25) amplifier, simply power off the amplifier. This will allow you to run straight through directly to the antenna without power amplification on that band.

V25D / U25D
These amplifiers will only operate within their specified VHF or UHF range. This is due to the circuit switching design of DMR Tier II and P25 Phase 2.

Hook Up

The simplest configuration is using the included RF cable to attach the radio to the amp. You could add a Spkr/Micr to the handheld, but you would still be bypassing some of the best features.

I use the two included cables. The 3′ RF cable to attach the radio to the amp, and the control cable. This allows me to use the full size hand microphone as well as connecting the four watt audio amp powering the speaker. The power included power cable is compatible with handhelds using the standard two pin Kenwood style connector, such as an MD380, D868, GD77, UV5R, F8HP, UV82, etc.

I use an Anytone D868 on DMR as well as analog with the hookup diagrammed below. Depending on your radios antenna jack, you may need to pickup an SMA-M to SMA-M adapter.

 

Convenience

All channel selection and volume adjustments are done using the handheld. No duplicate programming or code plugs are necessary. Whatever is in my handheld is what I operate in the mobile

Operating my handheld in the low power position, I still get 22W out on UHF and my handheld’s battery life remains excellent, but high power gives me a solid 39W.

Conclusion

I was glad to see someone finally develop what is a full featured mobile amplifier capable of  DMR as well as all other modes including C4FM and D-Star that is small enough to mount in the car, boat, and on top of your computer. This amplifier is Part 90 certified and definitely worth considering.

Available from Amazon:    V25     V25D     U25     U25D
and     

VHF /UHF
Digital / Analog
Mobile Power Amplifiers

 

On the Air – SOTA, POTA, BOTA, IOTA and now, COTA

The newest OTA I’ve discovered is the World Castles Award, or COTA – Castles on the Air. Not sure if COTA is official or not, but let’s call it that for now, since it rhymes so well with SOTA, POTA and BOTA. (IOTA is only a half-rhyme).

You might think “We Americans don’t have any castles here; we were settled after the period of castle-building, so how is this relevant to me?” Well, you can think that if you want to, but you might be wrongish. True, we have no castles in North America (or do we? – see below), but we do have other structures that the wise men and women of WCA have recognized as eligible structures of note. Happy Dance! Here’s a new game we can play once we’re all worn out activating all the mountains in SOTA, parks in POTA, and beaches in BOTA.

Here in the Southeast that I inhabit, there are scores of eligible structures. In my own tiny hometown of Decatur, GA, pop. 18,000, I find that we, too, have a castle called Oakhurst Castle. I need to find out what that is, and of course, activate it. Look for me on Dxsummit some day.

Forts, even if not fortified, can qualify, such as Fort Jackson, SC, where I spent three happy months one summer and most if not all other military bases with “Fort” in their title. Also, historic forts like Castillo de San Marcos in St. Augustine, Florida qualifies but the towns of Fort Lauderdale, Fort Myers and Fort Pierce where we can imagine forts once stood, are sadly excluded. However, don’t despair – you can still go to the beach in those towns and activate your suntan via BOTA!

Mansions, or “Stately Homes,” also seem to qualify, such as the indisputably stately Biltmore House in Asheville (raise your hand if you’ve been there). The WCA styles it as “Biltmore Castle.”

Scanning the list I see others in my haunts I can consider activating and some that raise questions such as one on Marco Island known only as “Unknown Castle.”

But there is one I expected to see that has been overlooked – probably the only purpose-build Castle in the United States, and it’s certainly not unknown; of course I’m talking about Cinderella’s Castle at the Magic Kingdom (raise your hand again if you’ve been there). If you are as hurt as I am at this (rather slight) slight, please join me in a letter-writing campaign to the WCA to help right this wrong. We’re Americans – we fought for our freedom, now we must fight for Cinderella’s honor!

Signing off for now, de k4wk, www.hamdom.com. Thanks for listening; you’re in the log.

A Personal Self Defense Weapon, a Utility Hammer, and a DMR #Hamradio, All-in-One

My first impression of my new TYT MD-380 (and Steve, KA4RSZ, felt the same way), was the solid, sturdy feel of the thing.  Not at all what you’d expect from an $88 plastic cased electronic device of any sort.  We were both quite impressed, and the reason has become clearer as I’ve learned more.  This radio or its kin, were built for non-ham, heavy-duty use by folks like security guards and retail store personnel, not dainty and refined hams such as ourselves.

Reading the User’s Manual has been fun, and incidentally makes the bizarre Icom manuals seem lucid.  Filled with handy tips, I love where it cautions me on page one “Do not transmit too long, for the radio may heat and hurt the user.”  Also advising “if the radio appears smelly or smoke, please shut off…”  Great tips for us all.

On page six it is reassuring to be told “wearing the radio in your waist will not make you feel uncomfortable.”  I just love Chinglish!

Signing off for now, de k4wk, www.hamdon.com.  Thanks for listening; you’re in the log.

Not so "oldies".

Thanks again to Mike KD5KC for posting these on QRP-L.

You may remember a few years ago (I think it was just a few years ago - maybe 10 years?, or maybe I'm having a "senior moment"?) Icom released a series of comics entitled "The Adventures of Zack and Max".  These were anime style comic books intended (I guess) to get the youngsters curious about Amateur Radio.

Max was a strange little pig companion to Zack - a boy and his pig - go figure.


Anyway, here are their links - both as comic books or as coloring books. If you have any kids or grandkids who are curious about what it is that you do - these may be helpful to explain it to them in a more contemporary fashion.

The Adventures of Zack and Max, Vol 1-7
http://www.icomamerica.com/en/amateur/comic_book/Books/v1/ComicBookV1color.pdf
http://www.icomamerica.com/en/amateur/comic_book/Books/v2/ComicBookV2color.pdf
http://www.icomamerica.com/en/amateur/comic_book/Books/v3/ComicBookV3color.pdf
http://www.icomamerica.com/en/amateur/comic_book/Books/v4/ComicBookV4color.pdf
http://www.icomamerica.com/en/amateur/comic_book/Books/v5/ComicBookV5color.pdf
http://www.icomamerica.com/en/amateur/comic_book/Books/v6/ComicBookV6color.pdf
http://www.icomamerica.com/en/amateur/comic_book/Books/v7/ComicBookV7_Color.pdf

Accompanying coloring books of The Adventures of Zack and Max.
http://www.icomamerica.com/en/amateur/comic_book/Books/v1/ComicBookV1BW.pdf
http://www.icomamerica.com/en/amateur/comic_book/Books/v2/ComicBookV2BW.pdf
http://www.icomamerica.com/en/amateur/comic_book/Books/v3/ComicBookV3BW.pdf
http://www.icomamerica.com/en/amateur/comic_book/Books/v4/ComicBookV4BW.pdf
http://www.icomamerica.com/en/amateur/comic_book/Books/v5/ComicBookV5BW.pdf
http://www.icomamerica.com/en/amateur/comic_book/Books/v6/ComicBookV6BW.pdf
http://www.icomamerica.com/en/amateur/comic_book/Books/v7/ComicBookV7_BW.pdf

72 de Larry W2LJ
QRP - When you care to send the very least!

Some more oldies, but goodies

This list was posted on QRP-L by Mike Olbrisch KD5KC - The Radio Boys series.  These books are in the same genre as The Hardy Boys or Tom Swift, but these deal with "wireless" and go back to the early 1920s when Amateur Radio was still in its infancy.


For those of you with a kindle, these can be download for FREE from Amazon.

1. The Radio Boys’ First Wireless
https://www.amazon.com/gp/product/B008476T3S/

2. The Radio Boys at Ocean Point
https://www.amazon.com/gp/product/B004TSAZWM/

3. The Radio Boys at the Sending Station
https://www.amazon.com/gp/product/B004TQF6BE/

4. The Radio Boys at Mountain Pass
https://www.amazon.com/gp/product/B006T5TLSM/

5. The Radio Boys Trailing a Voice
https://www.amazon.com/gp/product/B004TRF6S6/

6. The Radio Boys on the Mexican Border
https://www.amazon.com/gp/product/B004TIJRP8/

7. The Radio Boys on Secret Service Duty
https://www.amazon.com/gp/product/B00AQMGFB0/

8. The Radio Boys in the Thousand Islands
https://www.amazon.com/gp/product/B00AQMZS86/

9. The Radio Boys’ Search for the Inca’s Treasure
https://www.amazon.com/gp/product/B004Z0MNBU/

10. The Radio Boys Rescue the Lost Alaska Expedition
https://www.amazon.com/gp/product/B0058KSAW2/

11. Radio Boys Cronies
https://www.amazon.com/gp/product/B00848O6YQ/

12. Radio Boys Loyalty: Bill Brown Listens In
https://www.amazon.com/gp/product/B004TRO448/

13. The Radio Boys with the Revenue Guards
https://www.amazon.com/gp/product/B004UKEU2A/

So yeah, the stories are a bit campy, perhaps and the language and slang is old - but what the heck? They're free and they're almost 100 years old!

I downloaded them all to my kindle and am enjoying them. I hope you will, too!

72 de Larry W2LJ
QRP - When you care to send the very least!



A little dated

but still fun to look through:

The Archie comic book issue devoted to Amateur Radio - https://kk4dsd.files.wordpress.com/2013/09/archies_ham_radio_adventure.pdf


I don't know if kids read comic books, anymore - other than graphic novels.  I was past kidhood when this first came out. As one who DID read Archie comics at one point, I can confidently say, that had it come out when I was a youngster, it would be dog-eared, and practically worn out from being read so much!

Hope it stirs some fond memories for you!

72 de Larry W2LJ
QRP - When you care to send the very least!

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