Bitcoin donations to: 1CE9UfWJcHBYkWPns7iqBqZgKhd5xfqEaM thanks!
Buy Bitcoins easily by clicking HERE!

Recent Posts

Pages: 1 [2] 3 4 ... 10
11
Antennas / Re: Random wire antennas and tuners
« Last post by gil on May 17, 2018, 02:08:26 PM »
Quote
I am not sure and pretty clueless if the tuner is maybe malfunctioning.

Probably. I would re-check your wiring, there has to be a mistake in there somewhere...

Gil.
12
Antennas / Random wire antennas and tuners
« Last post by CPR on May 17, 2018, 09:22:06 AM »
I got myself a Z Match Multi Tuner from QRP Guys. With 35$ its quite cheap, but winding the toroids is a pain in the butt.
First, a question about the functionality before I head over to the random wire antennas. I hope that's okay and won't be classified as offtopic.

Yesterday I tuned my triband vertical and decided to try out the tuner with the vertical to see if it does something.
When I switch to "TUNE" I can get the SWR down to 1.1. As soon I switch over to the "OPERATE" position the SWR jumps over 10.. I was using my Mini60s attached to the tuner going then to the antenna. I thought maybe the power of the mini60s is to weak to get a reading on operate, but I am not sure and pretty clueless if the tuner is maybe malfunctioning.

Another question is the random wire, assuming the tuner works, I thought about attaching the random wire and use it as an endfed antenna! Would be the cheap option for now, as my favourite endfed multiband is the mini from HyEndfed and with over 100€ it's clearly over my budget at the moment.
Anyway, I found a good website about random wires: http://udel.edu/~mm/ham/randomWire/

Does anyone have any experience on the "best" length given: 
Quote
A standard recommendation (see QST, March 1936, p. 32, "An Unorthodox Antenna") is an 84' long end fed and a 17' long counterpoise (6.5' for 20m)

How do you layout the counterpoise at a random wire? Do you have to adjust the length of the counterpoise depending on the band tuned or does the tuner take over that part too? I don't understand what they mean with this 6.5' for 20m in the bracket.

Best,
CPR

13
General Discussion / Re: Remove old private messages please.
« Last post by gil on May 17, 2018, 05:30:35 AM »
Thank you. It is no longer an issue now. I added lots of space...

Gil.
14
New To Radio / 2018 New Dual band amateur radio Retevis RT3S
« Last post by Cherry on May 17, 2018, 05:05:30 AM »
Retevis RT3S is released and will come at the end of May.


This ham radio equipment RT3s will be the newest DMR radio in 2018. It was Built on the popular DMR radio RT3 and it is a dual band handheld transceiver offering UHF and VHF functionality. We can say it is the update from the Retevis RT3 single band to dual band RT3S.

Let’s learn about this ham radio handset RT3s
RT3S
Display:
Color LCD display
 Call Features:
Single/Group/All Call
Specifications:
Frequency Range:  136-174Mhz & 400-480Mhz
Channels: 3000 Channels
Battery Capacity: 2000mAH Li-Ion
Power: High Power 5W, Low Power 1W
Dimensions: 131 x 61 x 36 mm
Weight: 258g
Main Features:
Emergency Call
Digital & Analog mode
Group Call Match (Promiscuous)
Private Call Match (Promiscuous)
Motorola Tier I & II Compatible
GPS optional
Colour LCD Display
Lone Worker
Dual Time Slot for repeater and point to point
8 Hours Recording
Remore kill/ stun and activate
Firmware update
Time-Division Multi-Access(TDMA) digital technology.
It complies with DMR digital protocol, can work with Motorola Radio.
 

If have any question, please feel free to leave a message here! We are also looking for the Influencers that with the experiences about how to operate a DMR radio, if you are the one, contact us: partner@Retevis.com
More informations, please click this blog: http://blog.retevis.com/retevis-rt3s-dual-band-dmr-radio/
15
General Discussion / Re: Remove old private messages please.
« Last post by Piyapongs on May 17, 2018, 01:26:20 AM »
I delete it regularlyI delete it regularly because it makes more storage space. because it makes more storage space.
16
Antennas / Re: MR100 Cheap Chinese Antenna Analyzer Review.
« Last post by gil on May 16, 2018, 01:11:51 PM »
Quote
I have this Mini60S is this similar to yours Gil?

Hi, I think it is similar, just a different box...

Gil.
17
Antennas / Re: MR100 Cheap Chinese Antenna Analyzer Review.
« Last post by Skynet on May 15, 2018, 08:50:40 PM »
I have this Mini60S is this similar to yours Gil?
I included a picture and a scan of my 30Mhz thru 87Mhz folding military whip antenna listening to 6meter band cq cq
Don
Kc9dfk
18
Antennas / Re: Magnetic loop antenna.
« Last post by Skynet on May 15, 2018, 08:31:38 PM »
Hi
I found a nice windows calculator for magnetic loops antenna which works from 1 thru 30Mhz Imperial and metric readouts of data.
http://www.iw5edi.com/software/magnetic-loop-calculator KI6GD designed it.

I'm building a loop for 20m meters with 7/8 AVA5-50 hardline which has an outside diameter of 1" or 25.4mm
The loop is going to be 16' circumference 5'1" diameter. I bought a 20 thru 130pf 4kv variable capacitor.
Don
19
Tactical Corner / Re: Sending Encrypted Messages in Morse Code.
« Last post by gil on May 15, 2018, 06:04:23 PM »
Thanks John, nice insight.
Gil

Sent from my SM-G928F using Tapatalk

20
Tactical Corner / Re: Sending Encrypted Messages in Morse Code.
« Last post by johno on May 15, 2018, 05:45:51 PM »
A little late to the party here, (only 9 months) but as I started reading this I was going to mention the one time pad site by Dirk Rijmenants, which “Quietguy” already did, which is excellent.  I should also tell you about

http://allworldwars.com/German-Radio-Intelligence-by-Albert-Praun.html

which was written by a bunch of Wehrmacht officers with radio intel experience in both WW-1 and WW-2.  One thing I thought was interesting was their mention of the Polish and Czechs pre-war exercises and when the Nazi's were actually on the move, the Poles and Czech's followed the same plans, complete with call signs and marshalling locations, which the Nazi's had already DF'd!  It's a long read and a little dry at times, but definitely is written by people who know their business.

We were always told in the Army to use wirelines between units in cantonment areas (I've laid miles of WD1-TT).   We were also told that about 11 seconds after pushing the mic button, the Russians could DF your position and have artillery on the way.  When we were in Bavaria for REFORGER, as long as we used speech security devices, there was terrific radio jamming from Czechoslovakia.  As soon as we went back to nonsecure and encryption pads, the jamming stopped.  Nowadays, they have frequency hoppers and I'd love to see how those work!

PS:  CW still does the job!
Pages: 1 [2] 3 4 ... 10