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Messages - CPR

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1
Hi new here just passed my tech and general tests this past weekend. I am looking for suggestions on a good solid rig to start with. I am looking at a Yaesu FT-8900R as a potential starting point and a chameleon F Loop Plus or Alpha Antenna 10-80M Multiband Military 2.0. I would welcome any comments or suggestions and looking forward to learning more and hopefully being able to contribute to the site at some point.


Thanks Phillip   KE8JWD
Congrats on your exam.
To choose a rig you need to know:
What's your budget?
What are you intentions on ham? Only inside the shack comms or outdoor comms too? Outdoor comms with a car or backpack? Multiday outdoor comms with backpack? HF only or UHF and VHF too? QRP or not?

Cheers,
Via TapaTalk


2
Antennas / Re: Random wire antennas and tuners
« on: May 22, 2018, 07:20:11 AM »
What's weird is that it seems to work in tune mode... Look at the circuit diagram and what happens when you flip that switch...

Gil.

It just bypasses the whole SWR indication circuit.

Quote
The tuner is rated at 5W CW, 10 watts PEP max. and incorporates the N7VE LED absorption bridge
circuit for sensing SWR. In the TUNE position, you cannot damage your transmitter caused by a high
SWR. The worst your transmitter is looking at is a maximum of 2:1 SWR in the TUNE position.

3
New To Radio / Re: What do I need?
« on: May 22, 2018, 07:06:12 AM »
Let's try to make contact when you get your call sign!

Gil.

Yes, I am looking forward to!  :D

4
Antennas / Re: Random wire antennas and tuners
« on: May 22, 2018, 07:05:06 AM »
It does help in that regard, but the main goal of using a 9:1 UNUN is to lower the impedance of the random wire so that the tuner can tune it. Some tuners are good enough to tune a random wire without a UNUN, but not all of them. I also like the UNUN option because it lowers the impedance for the coax, and thus lowers cable losses. The best of course would be a Tuner/UNUN combination; QRPGuys have one.

I would suggest contacting QRPGuys about your tuner, something is definitely not right there...

Gil.

Okay. In that case I'll order myself a thoroid, get some wires and build an UNUN. I contacted QRP guys but not getting an answer from them. I have a spare polyvaricon variable capacitor that I am going to use to exchange theirs, because it seems the inner insulation between the metal plates is damaged. Maybe that's the issue, I dont know.

5
Technical Corner / Re: Modding MTR4b for 13.8 volts..... possible ?
« on: May 22, 2018, 06:11:26 AM »
You need a voltage regulator or a step down.

Example:

https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.com%2Fulk%2Fitm%2F162867196965

Enviado desde mi Redmi Note 4 mediante Tapatalk

And some ferrit cores wound before it enters the radio I guess. Somewhere I read about extreme noise created from those regulators.

6
New To Radio / Re: What do I need?
« on: May 22, 2018, 06:07:04 AM »
Trying out the reception on the vertical triband. It's awesome, listened global chatter.
This one is between Belfast and Pretoria.

https://www.youtube.com/watch?v=fo8UOFVNlBU

BTW I passed my exam, waiting for my callsign and all that buerocratic crap  ::)

7
Antennas / Re: Random wire antennas and tuners
« on: May 22, 2018, 06:05:20 AM »
I have cut and built the random wire for my tuner. I can get 1.2 SWR across the bands when my tuner is on the tune position but as soon I hit the OPER position the SWR skyrockets > 10. I am clueless. Anyway, usually, you attach the wire directly to the tuner with the ground wire. To avoid hanging your tuner directly to the wire, you get an 9:1 unun to feed the random wire from tuner to coax, is that correct?



8
Antennas / Re: Random wire antennas and tuners
« on: May 19, 2018, 02:45:52 AM »
Thanks for the hints andy. Will do that.
Regarding the bad swr on the verical triband. It was caused from the radials not touching the ground. I staked them out so before, was a mistake.

Via TapaTalk


9
Antennas / Re: Random wire antennas and tuners
« on: May 18, 2018, 06:29:40 AM »
No, it's all like it should be. I contacted QRP guys about that issue but haven't got an answer yet. I should have got that MFJ971 for portable tuning, IMO that tuner kit is garbage.

10
Antennas / Random wire antennas and tuners
« 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


11
New To Radio / Re: What do I need?
« on: May 15, 2018, 02:59:25 PM »
I went to my homestead today with all that gear to tune the antenna. I had constant swr above 10. Impedance was abnormal high on 700 and more. I knew something was wrong. At home I measured the coax and the inner core had no contact from end to end... Better luck next time...








Via TapaTalk


12
New To Radio / Re: What do I need?
« on: May 15, 2018, 05:50:24 AM »
I had my exam yesterday. I assume I have passed, knew all the answers. Unfortunately, I have to wait for my results, will get them this week I guess. Then do some bureaucratic stuff to get my callsign and permission for the station.
I had a nice chat with 9A9A, he was the supervisor on the exam. I was surprised to meet him because I ran into lot of youtube videos from people having contacts with him. He was mostly doing pileups.
Anyway, my Mini60s arrived some days ago and today if it will not rain I am heading out to trim and adjust the triband vertical.

13
New To Radio / Re: What do I need?
« on: May 09, 2018, 05:51:06 PM »
I was bored and decided to built those two kits. The only issues I had were missing information e.g. how to strip magnetic wires for toroids...

Anyway, it was quite easy although the manual gave me sometimes heas scratches...
Also, it seems I damages the plastic foil insulation in the variable capacitor on the zmatch tuner while removing the cover (totally dumb btw.) to cut out bigger holes so the pins can be bent farther down... No comment. Anyway, when I rotate the one capacitor you can hear the foil scratching. I hope it wont influence the capacitor... Otherwise i'll get a new one.



Via TapaTalk


14
New To Radio / Re: What do I need?
« on: May 09, 2018, 04:18:23 AM »
I received the tuner and the antenna. I've never built such kits but I am not new to soldering. We'll see.

Via TapaTalk


15
New To Radio / Re: What do I need?
« on: May 08, 2018, 01:10:47 PM »
Thanks for the info Gil. So I could use that Zmatch tuner with the tribander for optimal swr?

Via TapaTalk


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