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   Home   Help Search  
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 41 
 on: Today at 04:18:46 AM 
Started by KK4YDR - Last post by KC1BMD
ZENKI: Will be interested in your review after using it. Any comments about Anan technologies compared to Flex?

 42 
 on: Today at 04:17:34 AM 
Started by CHRISDX - Last post by W8JX

Having checked the specifications, the RG-58 Chris has ordered is rated to 1400 Volts - well more than enough for a Kw into a decent SWR load.


The voltage rating limiting factor only for very high SWR not on a reasonably resonant load. (1 kw is just a little over 200v in a 50 ohm load) Conductor/cable size and its attenuation is limit here. I like smaller cables but 58 is too small for a balun that will see 1 kw or more high duty cycles. The core may be slow to heat because of its mass but it will heat over time and get quite warm and cable even warmer over time and cool very slowly due to limited surface are for its thermal mass. What 58 can safely handle long term in a single run vs in a tight coil is a different matter completely.

 43 
 on: Today at 03:58:42 AM 
Started by KC8KTN - Last post by SWMAN
How about Three Dog Night, Just An Old Fashion Love Song "Playin on the Radio" .

 44 
 on: Today at 03:58:16 AM 
Started by OSCILLATORS - Last post by OSCILLATORS
In order to clarify a theoretical curiosity and put the dilemma to bed once and for all, I am looking for reliable measurement data about two (or more) collinear half wave dipoles driven at their resonant frequencies in phase with identical input signals. The most important data we are looking for is the input impedance (primarily resistance) as the function of distance between the dipoles. The range of interest is between zero and lambda/2. The preferred setup is vertical (or ideally even better performed in an anechoic chamber), but measurements on a horizontal array would also help.

I have been searching for such data on the internet now for many days with no luck; so it either doesn’t exist or I am not using the right search terms. I have simulated the setup in 4NEC2 but we must make sure the results are correct, and only “mother nature” can give the ultimate answer about how she really works. With other words, the simulation data can not be a substitute for real life measurements in this case. Since the measurement is not complicated I could perform it myself, but unfortunately right now I don’t have the necessary equipment.

If anybody knows where to find the requested data, or willing to perform the measurement, I would be very thankful for help.

Zoltan

 45 
 on: Today at 03:56:37 AM 
Started by W4BOW - Last post by VK6HP
Could be faulty, but have you checked that the link selecting re-chargeable or disposable batteries is set to the right position?  As I recall my 269 came with the link set for re-chargeable batteries.  The downloadable manual describes the link installation and correct positioning.

 46 
 on: Today at 03:51:24 AM 
Started by VK4FFAB - Last post by VK5EEE
It's nice to know that the only user who is on my ignore list is still on there for so many great reasons. I thought I'd take a look this once, and I'm not disappointed: A headline that makes no sense, and thus is ready to waste EVERYONE'S time, and then a link without any hint or description. Think I or anyone in their right mind would bother to click on that? Yep, IGNORE is right! Here is one for you to click on: http://bit.ly/dkwe888q2;kjakgj;

 47 
 on: Today at 03:46:39 AM 
Started by KB4MNG - Last post by VK5EEE
Agree K7MEM and that not ending with an invitation to transmit indicates disinterest, if not arrogance, or just enjoying CQ or button pushing... but disagree KE6EE that using a memory keyer for a CQ indicates disinterest. I use it in the following circumstances: I have called CQ already long, the band appears to be open but no one is around, and I'm going to rush into the kitchen get a drink, but don't want to lose that time, so it can be doing another CQ while I do that. Why not? That's not disinterest. Or, even doing something else that can be dropped, but that way if I'm calling CQ half an hour on a quiet band, I can get the chance of QSO by having the auto CQ. I don't see how that is disinterest either, but just efficient use of time.

We're not far off the torture though of a fully automated QSO where you call CQ, someone answers, you respond, they have pushed a button, the software decodes your data, then responds to you automatically with programmed macros, inserts lots of di-dah-di-dah-di-dahs in a row "..." and says (and I've actually had this torture more than once!): HI THERE OM GREAT TO MEET YOU THANKS FOR THE QSO YOUR RST IS 5NN AND THE HANDLE THIS WAY IS JIM I'M RUNNING AN ICOM 72000-E (MK 2) yes with the dah-di-dah-dah-dit and dah-di-dah-dah-di-dah, and THAT "guy" (I'd put a worse word here) is really off making coffee and sitting out with his friends on his balcony while you are being tortured with non-QSK QRS pre-programmed long-winded computer CW and an inefficient decoder that still mistook VK5EEE as VK-ERROR! Now THAT is what I'd worry about, not a button-CQ :-)

 48 
 on: Today at 03:35:37 AM 
Started by W4KYR - Last post by W4KYR
$500 New Xiegu X5105 (Five Watt) HF + 6 Meters Due Early 2017 

Currently, information about this new unit is rather sparse and from what I am reading here this is said to cost around $500 and available in sometime in early 2017. I assume it is supposed to be a competitor to the the KX2. Right now there are a few, very short 7 second videos on YouTube and hopefully soon a longer and more detailed video is coming soon. Search for Xiegu X5105 over at YouTube for the most up to date video.

My thoughts? It is too early to tell. I don't know if the final price will be $500 or more. How much more are the accessories going to be? More important is, what is the reliability? And are enough going to be available or will this be endlessly out of stock? If everything checks out, they will eventually need a U.S. distributor. How about it Vibroplex/TenTec ?

Anyway, you know as much as I do right now. One thing for certain, while earlier models of Xiengu radios got less than stellar reviews. Their current X108G model is highly rated right here on eham, with the X108G receiving a solid 4.8/5 out of 12 posted reviews.
 http://www.eham.net/reviews/detail/12587

Here are a few sites with limited information. If you have Facebook, there is even a " Xiegu X108G & X5105 Facebook group.. "

Disclaimer: This is FYI,  I have no connection whatsoever to the company. I am just passing along information that might be of interest to others here on the forum.



http://www.cqxiegu.com/index.php?route=product/product&product_id=63

Highlights

Quote
"X5105 is a highly portable  transceiver working at HF+6m band, with a built-in power output of 5W.

Technical features: double-conversion superheterodyne, fitted with up to 3 lithium batteries of 18,650mph each.

Expandability

l  A standard main unit (embedded with one 8-pole 2.7k-SSB crystal filter)

l  An optional high stability, high precision TCXO module

l  An optional 500Hz narrow band crystal filter

l  An optional plug-in 5W antenna tuner module"


Also

http://www.cqxiegu.com/index.php?route=product/product&product_id=63

Quote
"X5105 is a highly portable  transceiver working at HF+6m band, with a built-in power output of 5W. Technical features: double-conversion superheterodyne, fitted with up to 3 lithium batteries of 18,650mph each. Expandabilityl  A standard main unit (embedded with one 8-pol."

And

http://swling.com/blog/tag/xiegu-x5105-transceiver/


Quote
"Many thanks to SWLing Post reader, Mike, who writes:

    I thought your readers might like to know about the new Xiegu X5105 [HF] transceiver which is being developed by the Wouxun group out of China (the same company who produces an inexpensive line of amateur HTs).

    According to YaesuFT817.com, the X5105’s receiver is a double-conversion superheterodyne design and is made portable by way of 3 rechargeable lithium batteries of 1.8 mAh each. Native output of 5 watts.

    I’ve read that the price will be around $500 US.

    The X-108 forum also has the following message, I assume, from a company representative…

    “Xiegu Tech will launch new products. I’m very pleased to share relevant information with you:-)

    I. X5105 short wave transceiver

        X5105 is a highly portable transceiver working at HF+6m band, with a built-in power output of 5W.
        Technical features: double-conversion superheterodyne, fitted with up to 3 lithium batteries of 18,650mph each.
        Expandability
        A standard main unit (embedded with one 8-pole 2.7k-SSB crystal filter)
        An optional high stability, high precision TCXO module
        An optional 500Hz narrow band crystal filter
        An optional plug-in 5W antenna tuner module "


Finally "Xiegu X108G & X5105 facebook group.."

https://www.facebook.com/groups/578581345625251/

Photo from https://www.hamradioreviews.eu/2017/01/17/xiegu-x5105-qrp-radio-first-images/


.

 49 
 on: Today at 03:20:48 AM 
Started by N4UE - Last post by N1CX
Quality will now slide for profit. They were good antennas. Doesn't mean crap now when your standing in the field missing bolts, hardware and tubing being drilled or cut wrong..


 50 
 on: Today at 03:07:24 AM 
Started by AA6YQ - Last post by K3TN
I tuned across a few folks working the UK7 on 80M the other night but on my 135' OCF dipole the UK7 was not readable here (Maryland). I hung around for a while but in a short while but it was after their 0245z sunrise and it all faded out.

I also found a UK9 one am on 40m at their sunset, but he wasn't hearing anyone and not a peep on 80m at that time.

I've worked them before on 80 (never 160) but never anyone there who did LotW - I think UK7AR has been my only LotW confirmation. That doesn't matter for DX Marathon, I guess.

73 John K3TN

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