Re: Topband: Mag loop 400W if possible.

Wish you all the best with the antenna project Jon but not sure your apartment neighbors are going to love your indoor 400W on topband ;-) 73, Barry N1EU On Sun, Nov 15, 2015 at 12:59 PM, jonathan white < jonathan.whit...@btinternet.com> wrote: > Hi I am in a bit of trouble I will be mooing to

Re: Topband: Mag loop 400W if possible.

I like to use AA5TB's calculator to get a quick estimate for mag loops. http://www.aa5tb.com/loop.html#cal Also see http://www.aa5tb.com/loop.html Example: 10 ft diameter loop made from 1 inch diameter copper pipe, 0.05 ohms added resistance 1.8 MHz efficiency = 4.95% Bandwidth = 1.5 kHz Cap

Re: Topband: Mag loop 400W if possible.

I forgot to mention. 10 ft diameter loop is about the smallest loop that will tune with your 1000 pf cap. A 10 ft loop needs 843 pf. Use 2 inch diameter pipe and you need 982 pf. You can see that with AA5TB's calculator. Jerry, K4SAV On 11/15/2015 9:18 AM, K4SAV wrote: I like to use

Topband: Evolution

Just after midnight - early Sunday morning,  listened on lower MW     472.5 KHZ and copied WG2XKA  559,  and  on 474.5 KHZ copied WG2XJM  589. This on my 160 meter TX verticals.  My RX antennas are intentionally limited not to go much below 1800 KHZ to minimize BCB signal pick up.   Will need

Re: Topband: Evolution

Hi Bruce, I also listened a few times on 630 meters over the weekend. My 580 foot Beverages worked great as receiving antennas with a K3S. Although they're much too short to provide much useful directivity, they have excellent sensitivity. WG2XKA and WG2XJM were 579-599 every time I

Re: Topband: Mag loop 400W if possible.

Hi Jon, There are a lot of reasons why you can't do it. But you will need a physically large loop for the little 1000pF cap. Start with 8 foot diameter and maybe up to twelve feet. My loops are round and a twelve foot loop probably won't fit between the floor and ceiling of your flat. Make

Re: Topband: Mag loop 400W if possible.

The question always is the amount of area inside the loop and keeping the most distance between opposing sides. There are no tricks or magic. It is all about low resistance and maximum physical size. More loss will help it handle more power for a given capacitor voltage, but you don't want

Re: Topband: Mag loop 400W if possible.

Your country may not have the same RF safety rules that we have in the US. For the US those rules are at this link http://www.fcc.gov/Bureaus/Engineering_Technology/Documents/bulletins/oet65/oet65b.pdf The mag loop will be limited by the magnetic field strength along a line perpendicular to

Topband: Mag loop 400W if possible.

Hi I am in a bit of trouble I will be mooing to a flat/apartment ,so can anyone give me details of a mag loop that will fit in a room and also be able to be taken apart and resembled on a beach,will use big vac cap 1000pf 40kv Russian type,any takers,and please dont laugh I love topband. 73`s

Re: Topband: Mag loop 400W if possible.

On Sun, Nov 15, 2015 at 12:44 PM, jh-...@sbcglobal.net wrote: > Use the largest, heaviest hardline you can find. if you use hardline at all, it ought be be VERY BIG hardline! If the largest you can find is (for example) 7/8", that's simply not big enough, unless you are

Re: Topband: Evolution

Evolution?? Heck its more a return to our roots, seems to me we had the band long ago and it was taken from us, new low band? wonder what the guys using 136 KC think of that.Evolution may be in the new modes being used and new gear, but the band is a "welcome back" to what we lost

Re: Topband: Mag loop 400W if possible.

It's *possible* to construct an STL (small transmitting loop) with fairly good efficiency. But *NOT* one for 160 meters that fits inside a house! :-) I have a web page about STLs with lots of linked pages at www.w0btu.com/magnetic_loops.html Take particular note of the first two links there to

Re: Topband: Evolution

I guess its good I asked! I already have a K3, and it already has the new synthesizer boards. I didn't realize that the K3 put out 1mw on the transverter output; I did know it would directly tune the correct frequency range. All I need to get on 630meters is an amp, an antenna, and, of

Re: Topband: RX PREAMPS

I have both systems. The DXE 2 element system is 80 and 100 feet from my transmitter antenna, respectively. I have run 1.5 kW for the last several years without any problems, and with no sequencer. The Hi-Z triangular system is even closer (65') and has never had a problem. YMMV, 73, Bob

Re: Topband: Mag loop 400W if possible.

On 11/15/2015 4:59 AM, jonathan white wrote: Hi I am in a bit of trouble I will be mooing to a flat/apartment ,so can anyone give me details of a mag loop that will fit in a room and also be able to be taken apart and resembled on a beach,will use big vac cap 73`s Jon g8ccl For the beach, get

Re: Topband: Evolution

On Nov 15, 2015, at 11:13 20AM, K1FZ-Bruce wrote: > > 160 meters is low band, does this make the 470 band the "even lower band" ? Well, actually, we call 160 “Topband”. I suspect this makes 470 the “Over the Top” band … _ Topband Reflector Archives -

Topband: crossband

Crossband is allowed and requested, Go to for full details. http://www.arrl.org/news/arrl-medium-wave-experimenters-sponsoring-special -events-in-November LOWFER/MEDFER "MPK" Don W2MPK _ Topband Reflector Archives - http://www.contesting.com/_topband

Re: Topband: RX PREAMPS

I have used the HI Z rx system and also the DXE ones. HI Z said in the past no need for a sequencer to get power off the amps if the xmit ant was close to the rx system antennas. Close I would say 60 foot. DXE has always suggested using a sequencer to get power off the amps during xmit. I

Topband: bands

Think about it. The higher the meters the lower the band. Figure the 160 meter band in Khz and yes the 470 Khz and the 137 Khz band is lower. Don W2MPK _ Topband Reflector Archives - http://www.contesting.com/_topband

Re: Topband: Evolution

There is an Experimenter bacnd around 137kHz - 2200 Meters I guess this would be the Tip Top band. Mike N2MS - Original Message - From: W2RU - Bud Hippisley To: k...@myfairpoint.net Cc: topband@contesting.com Sent: Sun, 15 Nov 2015 23:33:39 - (UTC) Subject: Re:

Re: Topband: Mag loop 400W if possible.

His 400W TX power will likely be ~10 watts ERP if he does a good job on construction. 390W will be nothing but heat. :) - Original Message - From: "Barry N1EU" To: "topBand List" Sent: Sunday, November 15, 2015 8:59 AM Subject: Re:

Re: Topband: Mag loop 400W if possible.

I forget to add that the EZNEC simulation showed the gain of this loop to be about -10.8 dBi on 1.8 MHz. Matching network loss not included. Jerry On 11/15/2015 10:46 AM, Tom W8JI wrote: His 400W TX power will likely be ~10 watts ERP if he does a good job on construction. 390W will be

Topband: RX PREAMPS

I have used the HI Z rx system and also the DXE ones. HI Z said in the past no need for a sequencer to get power off the amps if the xmit ant was close to the rx system antennas. Close I would say 60 foot. DXE has always suggested using a sequencer to get power off the amps during xmit. I

Re: Topband: Evolution

Thanks to all the topbanders that had a listen on 630M this weekend. Unfortunately, Part 5 U.S. experimental stations can only QSO with other Part 5 stations, so crossband QSOs would be prohibited. But, since the VEs have an Amateur allocation already, it's "ham to ham". The list of beacon

Re: Topband: Evolution

Yes, & houses & gardens are getting smaller, well in UK. Also the effective size of one's pension ! It's all pain... 73 de Mort, G2JL _ Topband Reflector Archives - http://www.contesting.com/_topband

Re: Topband: Evolution

Can someone point me to a schematic for a transverter that can run with a K3? I'd like to build something up to try this out this new band. Dennis W1UE On 11/15/2015 1:21 PM, Merv Schweigert wrote: Evolution?? Heck its more a return to our roots, seems to me we had the band long ago and it

Re: Topband: Evolution

AMRAD upconverter: http://www.amrad.org/wp-content/uploads/2015/09/AMRAD_Low_Frequency_Upconverter-1.pdf FAR circuits even has PCBs for the AMRAD one, but easy enough to perfboard it. Some other ones, incl. commercial:

Re: Topband: Mag loop 400W if possible.

Use the largest, heaviest hardline you can find.  Also, rethink your resources.  I ran Top Band from a 2nd story apartment with a full-sized inverted L hidden in a tree, with radials running down the sides of the bldg., and worked 93 countries with 100-600W.  73 and GL, JH W6UQZ From:

Re: Topband: Mag loop 400W if possible.

On Sun,11/15/2015 10:44 AM, jh-...@sbcglobal.net wrote: Use the largest, heaviest hardline you can find. Also, rethink your resources. I ran Top Band from a 2nd story apartment with a full-sized inverted L hidden in a tree, with radials running down the sides of the bldg., and worked 93

Re: Topband: RX PREAMPS

Mike, It's your bud from Dayton. I will make this comment: I have modeled 160 rx antenna systems, Hi-Z 4 square and 8 Circle on EZNEC with the NEC-4 engine. Anything closer than 200 feet with a 160 tx antenna results in severe pattern distortion. Also measured +3 to +20 dBm coming into the K3 rx