Date   
Re: Add Power Switch to my QCX Enclosure #enclosure #qcx #mods

Joe Cotton
 

Very Nice.  I used a toggle switch, cause thats what I had in the parts box.  Also, I like your KEY button.  Looks like you used hardware similar to the other two buttons.  
73 Joe W3TTT

Re: Pneumatic antenna lanuchers

HF
 

I made and used one like Braden's for a while until I borrowed my friend's pneumatic launcher.  I'm too weak to shoot an antenna higher than 15 meters with my slingshot.  Building my pneumatic launcher required learning how to glue PVC pipe together which was much easier than I expected.  I used a $15 sprinkler valve meant for 24V operation (it works with much lower voltage than that). I put some nuts and bolts into an eye drops bottle and tied the fishing line to it as a weight.  It fits perfectly into the nominally 1-inch schedule 40 output pipe.  I used a $7 fishing reel with the 8-pound test line that came with it.  This launcher shoots higher than the very tall cedars and firs around here in northern Cascadia.  The 40-gram weight pulls the fishing line down over the branch, then I tie stronger line to it and pull it back.  Finally, I tie 1/8 inch polyester rope as a halyard to the stronger line and pull it through the third time.  I hope this summary helps the next person launch waves from the top of the canopy.  If anyone has ideas on how to make one of these launchers with total mass less than 500g, please chime in!  I want to build a version to take on backpacking trips with the QCX.
-Halden VE7UTS

Re: Large inductors in GPS supply and data lines ?

 

Thanks everyone for your responses.

It appears I may have lapsed a bit in my thinking, and created a problem.

Hopefully this weekend I will try another way of reducing noise.

73 de Andy

Re: Pneumatic antenna lanuchers

DK
 

I had a student once ask me if he could bring his Linear Vegetable Accelerator (LVA) to my college chemistry lab. 

We turned his LVA into a lab experiment ( more of a physics experiment, but what the heck) by estimating the flight path of a potato as a function of air pressure used in the LVA.

We abruptly stopped the experiment when the potatoes flew over the distant trees and into moving traffic.

Science is fun!!!

DK. KD6TK 

On Jun 21, 2019, at 6:44 AM, jjpurdum via Groups.Io <jjpurdum@...> wrote:

I used one of these a long time ago and I'm pretty sure the lead weight is in near-Earth orbit as we speak...

Jack, W8TEE

On Friday, June 21, 2019, 9:18:08 AM EDT, Braden Glett <bradenglett@...> wrote:


Here is my trusty antenna launcher that has served me long and well. Lightweight, cheap (all parts available at the sporting section of Walmart), and accurate. Also easy to prevent overshooting.

Re: Pneumatic antenna lanuchers

jjpurdum
 

I used one of these a long time ago and I'm pretty sure the lead weight is in near-Earth orbit as we speak...

Jack, W8TEE

On Friday, June 21, 2019, 9:18:08 AM EDT, Braden Glett <bradenglett@...> wrote:


Here is my trusty antenna launcher that has served me long and well. Lightweight, cheap (all parts available at the sporting section of Walmart), and accurate. Also easy to prevent overshooting.

Re: Pneumatic antenna lanuchers

Braden Glett
 

Here is my trusty antenna launcher that has served me long and well. Lightweight, cheap (all parts available at the sporting section of Walmart), and accurate. Also easy to prevent overshooting.

Re: 40m AMMO CAN FINDS A NEW HOME & NEEDS ADVICE! #40m #qcx #antennalaunching

James Daldry W4JED
 

Hi, Steve

Try a 1 foot long piece of half inch plastic pipe with a cheap fishing reel and monofilament line and a Wrist Rocket slingshot with a one ounce fishing sinker attached to it. Will do 60 feet easily. Shoot it, jiggle the line until the sinker hits the ground, disconnect the sinker and use the line to pull a piece of Paracord back to the reel. Disconnect the Paracord from the fishing line, attach a clothesline pulley to the Paracord, put another length of Paracord through the pulley, pull the pulley to the top of the tree with the original Paracord piece. Tie piece 1 to a branch high enough to prevent "people problems". Take piece 2, attach an egg insulator, cut and tie it into a closed loop that almost reaches the ground. The first piece can now grow into the tree branch it is strung over without causing any problems. Attach the antenna wire and pull it up while walking back and forth to keep the wire from getting caught on tree  limbs. Have fun.

73

Jim W4JED

On 6/20/19 3:05 PM, Steve Raas - N2JDQ - FN13DD wrote:
My 40M Ammo can QCX and I have found a new home (Well a second home) . 1.6 Acres in the Western VA Mountains. Its for sure no perfect location, but I have trees TALL TALL SCARY trees that tower over what seems everything, and lots of land.. as well as some ambition, however I only have a 6' step ladder! DOE!!! (Homer voice) What are you fellas using to launch fishing line up high to string antennas? And by high I mean HIGH..60+ feet. I been QRV a bit signing N2JDQ/4 but its just a low cloud burning dipole ..its time for some height! I do love my QCX, but a full QRO rig is in my near future..but dont fret, Ill never part with my QCX I absolutely love the thing!

-Steve Raas
N2JDQ/4 (At the moment)
Boonsboro, VA ( NW of Lynchburg )

Re: Large inductors in GPS supply and data lines ?

Jack <vhfplus@...>
 

The launcher shown on the web site is far more complex than the one obtained from the Joplin, MO, Amateur Radio Club, which performs quite nicely. The launcher used by my XYL and me may not have a vertical range of 150-feet but it does 50 to 55 feet easily and is very adequate for our needs. Rather than a tennis ball projectile it uses a PVC cylinder with an attachment eyelet on one end. It is ingenious and the price is certainly right.

http://joplin-arc.org/antenna-launchers/

73,

Jack, K0JP/VE3RUA

Re: #QCX : Is toroid's manufacturer Amidon? #qcx

Russ@va3rr
 

I've read that Amidon is a reseller of Micrometals toroids. I bought some powdered iron cores on Ebay from a chinese vendor that were not great...

#QCX : Is toroid's manufacturer Amidon? #qcx

Axel
 

Hi,

is the manufacturer of the toroids L1, L2, L3 and L4 Amidon?

(Just seeking for the reason of low power output of my newly built QCX.
Have ruled out capacitors, value of inductances, properly removed
isolation of enameled wire, etc.)

73 Axel DF1ET

Re: Receiver mixer with a different mux chip? #fst3253 #vhf

Kārlis Goba
 

The analog bandwidth is not the limiting factor, in fact similar switches all have around 300 MHz BW. What is important here how fast the switch works, which is t_on and t_off. In this regard it's not much different from other variations.

--
Karlis YL3JG

Receiver mixer with a different mux chip? #fst3253 #vhf

freefuel@...
 

if one were looking for better performance from the receiver module would this multiplexor chip be a viable option? the data sheet claims operation upto 300MHz  https://www.onsemi.com/pub/Collateral/FSAV331-D.pdf

-Justin N2TOH

Re: 40m AMMO CAN FINDS A NEW HOME & NEEDS ADVICE! #40m #qcx #antennalaunching

Ken Bell
 

Just put the reel on the ground. Works fine and every time.  I still wear safety glasses.  

QCX Stand - another take

WB5BKL
 

Simple prop stand (think ice lolly or Popsicle sticks).

Easy. Cheap. Fun. Grandkids assist with the materials.


cln - Nick
WB5BKL
Lake Buchanan, TX


<http://wb5bkl.blogspot.com/2019/06/popsicle-or-ice-lolly-qcx-stand.html>

Pneumatic antenna lanuchers

Brad Thompson
 

Hello--

Through the magical properties of plastic plumbing parts and compressed air, you
can deploy skywires to amazing heights...

http://www.antennalaunchers.com/antlaunching.html

Be aware that hypervigilant neighbors may get nervous when you brandish
something that looks like a shoulder-fired missile launcher<g>.
73--

Brad  AA1IP

--
Sent from Postbox

Re: Large inductors in GPS supply and data lines ?

Graham, VE3GTC
 

In the uBlox hardware integration manuals a recommended practice is to use a ferrite bead, inductor, or small value resistor to help mitigate noise.

The idea is to slow down a bit the rising and falling edges of the digital signals.

quote: "On the other hand, noise generated at the I/O pins will emit from unshielded I/O lines. Receiver performance may be degraded when this noise is coupled into the GNSS antenna (see Figure 14). To avoid interference by improperly shielded lines, it is recommended to use resistors (e.g. R>20 Ω), ferrite beads (e.g. BLM15HD102SN1) or inductors (e.g. LQG15HS47NJ02) on the I/O lines in series. These components should be chosen with care because they will affect also the signal rise times"

LQG15HS47NJ02 is 47nH

https://www.u-blox.com/sites/default/files/NEO-8Q-NEO-M8-FW3_HardwareIntegrationManual_%28UBX-15029985%29_0.pdf

cheers, Graham ve3gtc


On 2019-06-20 19:32, Richard G4TGJ wrote:
At 9.6kHz 470mH is about 28k ohm.
--
73
Richard
G4TGJ

Re: 40m AMMO CAN FINDS A NEW HOME & NEEDS ADVICE! #40m #qcx #antennalaunching

jjpurdum
 

Opps...

Someone may have a drone with a "claw" and TV camera on it.


Jack, W8TEE

On Thursday, June 20, 2019, 4:22:13 PM EDT, jjpurdum via Groups.Io <jjpurdum@...> wrote:


Check your club. Someone may have a draw with a "claw" and TV camera on it. That's the case for me and the Al (AC8GY) managed to drop the weight through a 3' opening in the canopy of trees...worked like a champ.

Jack, W8TEE



On Thursday, June 20, 2019, 4:00:28 PM EDT, Phillip Fimiani via Groups.Io <myamiphil@...> wrote:


How about a nice strong sling shot... Thin wire... small fishing weight... Never used one myself, but we had one of those two man long surgical tubing sling shots at a camp out once.... Awesome flight with eggs! Should send over a few trees!
Water Balloon Launcher 400 Yard Long Range, 3 Person Balloon Large Slingshot

or...
https://www.artofmanliness.com/articles/diy-weekend-project-how-to-make-a-slingshot/

So long as its not agin the law in West  Va!

Phil
KD2HTN

Re: 40m AMMO CAN FINDS A NEW HOME & NEEDS ADVICE! #40m #qcx #antennalaunching

Joe Street
 

I use exactly what Allison described, but I will add that the location of the fishing reel is important.  After hit and miss adventures with having the reel mounted out front of the wrist rocket I hit on the solution to line fouling (which can be dangerous ! wear some safety glasses)  I finaly realised that I should mount the reel on the forearm of the arm which draws back (right arm in my case).  This keeps the line behind everything and there is no more line fouling and hellfire rebounds with the lead weight.  If you have help just get the helper to stand behind you with the reel.  If not I found that a 2" wide velcro strap with a small slit in it allowed me to sneak the mount of the reel through and I could wrap the velcro just ahead of the elbow on my drawing arm.  It works very well.

Joe


On Thu, Jun 20, 2019 at 3:41 PM ajparent1/KB1GMX <kb1gmx@...> wrote:
THe tool I used is a modified WristRocket to include a spinning reel
full of 10 pound test and the weight is a 1-1.5oz sinker.

That has worked for stuff to 60ft (tall for here) with ease.  
More often I'm shooting for crook or limb in a useful place
rather than just over the whole shrub.

Once over I use it to pull back a piece of .050 paracord which is
strong enough to pull heavy lines if needed.  The usual line is
5/16 or 1//4 inch dacron line.

Allison

Re: 40m AMMO CAN FINDS A NEW HOME & NEEDS ADVICE! #40m #qcx #antennalaunching

jjpurdum
 

Check your club. Someone may have a draw with a "claw" and TV camera on it. That's the case for me and the Al (AC8GY) managed to drop the weight through a 3' opening in the canopy of trees...worked like a champ.

Jack, W8TEE



On Thursday, June 20, 2019, 4:00:28 PM EDT, Phillip Fimiani via Groups.Io <myamiphil@...> wrote:


How about a nice strong sling shot... Thin wire... small fishing weight... Never used one myself, but we had one of those two man long surgical tubing sling shots at a camp out once.... Awesome flight with eggs! Should send over a few trees!
Water Balloon Launcher 400 Yard Long Range, 3 Person Balloon Large Slingshot

or...
https://www.artofmanliness.com/articles/diy-weekend-project-how-to-make-a-slingshot/

So long as its not agin the law in West  Va!

Phil
KD2HTN

Re: Adding an on-off switch to my QCX

Gary Bernard
 

Robert, nice looking enclosure.
Regards, Gary W0CKI


-----Original Message-----
From: rentwist <rentwist@...>
To: QRPLabs <QRPLabs@groups.io>
Sent: Thu, Jun 20, 2019 1:44 pm
Subject: Re: [QRPLabs] Adding an on-off switch to my QCX

I added a switch to my QCX-40 but I have a homebrew case where the controls are relocated.  So, I just got a volume control with an On/Off swtich.  Also relocated the "stock" straight key.



73,

Robert, WA2T