Keyboard Shortcuts
ctrl + shift + ? :
Show all keyboard shortcuts
ctrl + g :
Navigate to a group
ctrl + shift + f :
Find
ctrl + / :
Quick actions
esc to dismiss
Likes
- Loopantennas
- Messages
Search
|
Locked
Which rx antenna to try first?
hi
moving to countryside this year, about September, so not much time to set up rx antennas for 160-40m for the winter season, especially considering i will be also erecting a 20m vertical ( along with ground works, 60 odd radials etc) plus doing ?up the house to Wifes satisfaction!!( very important!!) Dx tx will now become a big vertical ( inverted L, top hat loaded etc not decided untill have the place and can see best way to go,) ?against many radials, the big mag loop will be re used for inter Europe and UK.( assuming we not all dead due to ww3) moving will come ?with a large garden ( maybe even farmers fields, but for now lets assume no fields for beverages.) but atleast 1/3 area of ?antenna land! ( compared to my 5 by 8 m plot now!)? i have a few options..main goal is dx on 160rx..ie atleast hearing USA ?well from sw England. ( tx is easy even from ?here on the mag loop ssb) 160m.)? k9ay or k9ay¡¯s ( if enough space for 2 crossed) ewe or 2? Phased crossed parallel loops ( have a Lz1aq remote delay line switching box)? Phased cardioid loops ( have a Lz1aq remote switching delay line box)? phased lankford verticals..? having not tried any of the above in a quiet rf noise area I have no idea which will perform better for low angle elevation ?dx. i know the cardioid loops work ( got ?some here in London, but a single one is not good enough for reliable long haul dx, maybe 2 phased are, same for crossed parallel loops)? never tried k9ay or ewe as no space here. time is an issue..will not have long to do this before winter sets in.. have already acquired the 20m ali vertical, made ground mounts etc, so now getting together the rx antenna ¡° stuff¡±? anyone have a sensible input into what to try?? Thanks for reading g0zen? |
|
Locked
Re: [irca] Antenna Rotator Recommendations
Just to reactivate this subject for UK readers...
Nevada Radio and Waters & Stanton are now selling the AR600XL rotator at ?179.95. I've just bought one and it arrived today and will be installed next week. It is identical to the AR500, same spec, slightly different display. Tom G6PZZ |
|
Locked
Re: AM frontend overload?
There is another tool the amateur can use to view large swaths of spectrum:? The SDRPlay.? I was recently made aware of a spectrum analyzer application made for the SDRPlays by Steve Andrews.? In the past, the SDRPlay line-up of products has not necessarily been my favorite, but this app has finally moved my RSP1A off the shelf.? Steve's SA application is really outstanding and well beyond the capabilities of the SpectrumSpy for the AirSpy products.? Possibly that is why SDR# no longer offers SpectrumSpy?? Believe me, it's spiffy!!? I'd encourage anyone requiring more than 8 MHz of on-screen spectrum display to give it a try.? And it covers all the way down to the submarine comm band and below to almost "DC" without an external converter.? ???? Dave - W?LEV? On Mon, Jan 24, 2022 at 11:24 AM Martin via <martin_ehrenfried=[email protected]> wrote: On Mon, Jan 24, 2022 at 12:36 AM, Kun N7DMR wrote: -- Dave - W?LEV Just Let Darwin Work |
|
Locked
Re: AM frontend overload?
On Mon, Jan 24, 2022 at 12:36 AM, Kun N7DMR wrote:
Yes now you have the filter fitted, it looks like the loop seems to be performing OK with regard to overload. The rest of the interference looks like it's general noise and hash from switched mode power supplies, computers and other IT equipment or similar. You may not have noticed this before, but the ability to 'see' 30MHz of spectrum with the KiWi, makes it much easier to spot wideband swathes of noise, that may previously not been so apparent when observed in a narrower bandwidth. It was quite an eye opener when I got my first KiWi, as I thought my site was electrically quiet, but the waterfall and spectrum display told me otherwise. Regards, Martin |
|
Locked
Re: File /001.jpg uploaded
#file-notice
50-watts.? Remember, I live at 5700 feet elevation which will lower the voltage rating.? I can squeeze 100-watts if I'm careful, but usually limit it to 50 watts. In the picture, the variable capacitor looks off center.? It is not.? If I drop a plumb bob from the center of the gap, it falls in the center of the feed attachment at the base.? Dave - W?LEV On Mon, Jan 24, 2022 at 1:31 AM Grady Hawkins <gradyhawk1952@...> wrote: What level of wattage are you putting through it? -- Dave - W?LEV Just Let Darwin Work |
|
Locked
Re: AM frontend overload?
I can't install it in front of loop preamp. There is no place for me to install it. The preamp is on the antenna itself.?
But filter in front of my kiwi does solve most of the problem. |
|
Locked
Re: AM frontend overload?
Instal the BCB stopband filter in front of the loop preamp! Dave - W?LEV On Sun, Jan 23, 2022 at 7:21 PM Kun N7DMR <sa4591@...> wrote: Thanks. I have an existing RTL-SDR Blog AM BCB filter. I'll try to get it installed to see if it helps. I originally though it won't work because the signal already amplified by the Loop amplifier.? -- Dave - W?LEV Just Let Darwin Work |
|
Locked
Re: AM frontend overload?
Thanks. I have an existing RTL-SDR Blog AM BCB filter. I'll try to get it installed to see if it helps. I originally though it won't work because the signal already amplified by the Loop amplifier.?
|
|
Locked
File /001.jpg uploaded
#file-notice
[email protected] Notification
The following files have been uploaded to the Files area of the [email protected] group. By: W0LEV <davearea51a@...> Description: |
|
Locked
File /Transmitting Loop Antenna B.pdf uploaded
#file-notice
[email protected] Notification
The following files have been uploaded to the Files area of the [email protected] group. By: Chris Trask - N7ZWY/WDX3HLB <christrask@...> Description: |
|
Locked
Re: Transmit Loop?
On Sun, Jan 23, 2022 at 04:03 PM, Chris Trask - N7ZWY/WDX3HLB wrote:
I just put a copy into the group files section.?Hi Chris, Sorry I don't know what file type it is as the extension is weird, I've tried the obvious ones but still can't open it. I think I can see a reference to Pagemaker in the text but no other clues. Regards, Martin |
|
Locked
Re: Transmit Loop?
I've attached a copy of my own transmitting loop antenna.? It does not use the expensive variable vacuum capacitor not the difficult delta loop.Hi Chris, Can you put a copy in the files section, as the forum doesn't seem to like attachments ? ? I just put a copy into the group files section.? I was surprised that it wasn't there already.? There will be an announcement to the group shortly. ? Chris ? When the going gets weird, the weird turn pro - Hunter S. Thompson |
|
Locked
Re: Transmit Loop?
Would quite like to see your loop Chris..
Mine you can see on qrz.com. ( though does need the 40m loop pic updating.) I assume not commercial though? Simon g0zen |
|
Locked
Re: Transmit Loop?
On Sat, Jan 22, 2022 at 10:00 PM, Chris Trask - N7ZWY/WDX3HLB wrote:
I've attached a copy of my own transmitting loop antenna.? It does not use the expensive variable vacuum capacitor not the difficult delta loop.Hi Chris, Can you put a copy in the files section, as the forum doesn't seem to like attachments ? incidentally, for some reason your website link doesn't seem to be working. Regards, Martin |
|
Locked
Re: AM frontend overload?
Hi Kun,
You have three very strong broadcast stations operating on 1320, 1420 & 1490KHz which are overloading the receiver. I posted a notch attenuator circuit for you to try on the KiWi forum website. It's a simple series tuned circuit that is connected across the receiver input, and should provide at least 10 dB attenuation at 1320 & 1490KHz and 20dB attenuation at 1400KHz. 3dB attenuation frequencies are at 1000 & 1900KHz. The inductor and capacitor should have a decent Q in order to achieve a decent notch depth. Adjust the exact number of turns to tune the circuit to the required frequency. Regards,Martin |
|
Locked
Re: Transmit Loop?
As to the legality of phone (SSB) on 630-Meters, here it is off the ARRL page: Dave - W?LEV On Sat, Jan 22, 2022 at 11:43 PM David Eckhardt <davearea51a@...> wrote:
-- Dave - W?LEV Just Let Darwin Work |
|
Locked
Re: Transmit Loop?
In my home brewing for 630-meters, the audio power BJTs work very well.? Three or five hundred watts is easy on 630-meters using those.? FETs are a bit more fragile. Dave - W?LEV? On Sat, Jan 22, 2022 at 10:49 PM Simon <ohhellnotagain@...> wrote: Dave -- Dave - W?LEV Just Let Darwin Work |
|
Locked
Re: Transmit Loop?
Dave
You can not tx voice on 630m.. not allowed Plus bandwidth would be more like 500hz if lucky. My BIG 160m loop has bandwidth of 2.5khz ( just.) that has a circumference of 20m.i can not use the ldmos amp on that as its swr trip comes in ( set at 2:1 ) .Had to make a valve ( tube) amp for it.( could set the swr trip higher with out worries about damage.) amps are full legal.. A 1m dia loop would not be possible on 160, or 80 let alone 630m. Thats if you want it to work with any efficiency. Simon g0zen |
|
Locked
Re: Transmit Loop?
I've attached a copy of my own transmitting loop antenna.? It does not use the expensive variable vacuum capacitor not the difficult delta loop.
toggle quoted message
Show quoted text
? Chris Trask N7ZWY / WDX3HLB Senior Member IEEE -----Original Message-----
From: Sent: Jan 22, 2022 4:18 AM To: Subject: Re: [loopantennas] Transmit Loop? ? I am afraid i cannot recommend any ( except maybe for the ciro nazzoni, but that¡¯s very very expensive) All i have seen are over priced for what they are. ? Can you make one?? It if done well will out perorm commercial ones and be much cheaper.plus you have bragging rights you did it yourself. Plus not difficult for a low power one. ? Simon g0zen |
to navigate to use esc to dismiss