ATV on 6cms - It's Cheap and Easy on 5665MHz
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This forum is run by the BATC (British Amateur Television Club), it is service made freely available to all interested parties, please do not abuse this privilege.
Thank you
Re: ATV on 6cms - It's Cheap and Easy on 5665MHz
I use an old Sandpiper helical beam for 23 cms, mainly for it's wideband nature, it used to work well into the IOW repeater
until they lost their site. I even worked DL on SSB with 10 watts with it.
- Charles
until they lost their site. I even worked DL on SSB with 10 watts with it.
- Charles
Re: ATV on 6cms - It's Cheap and Easy on 5665MHz
There was also an interesting discussion during the "BATC CAT12 - Antennaes and Baluns that work" presentation.
Posted on BATCOnline YouTube channel.
Posted on BATCOnline YouTube channel.
Re: ATV on 6cms - It's Cheap and Easy on 5665MHz
My 5.6GHz gear is coming together, a bit of a rats nest but it seems to work ok. Just need an aerial now, where does the best deal guys?
73 Dave.
73 Dave.
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Re: ATV on 6cms - It's Cheap and Easy on 5665MHz
Me too Are aerials cheaper than 5.8 GHz coax relays??
Gareth
Gareth
Re: ATV on 6cms - It's Cheap and Easy on 5665MHz
Gareth,
A 2.4GHz version of the helical would be useful for an Es'hail-2 uplink. Does the material cause any loss? A minimalist version would also save on 'ink'.
Brian
A 2.4GHz version of the helical would be useful for an Es'hail-2 uplink. Does the material cause any loss? A minimalist version would also save on 'ink'.
Brian
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Re: ATV on 6cms - It's Cheap and Easy on 5665MHz
I'm going to microwave a sample today and report back. The www is surprisingly vague about the RF properties of PLA.
*** And the great news is that it seems unaffected. 1 minute in a 800 watt microwave with a cup of water, plastic came out stone cold. So it seems suitable for RF....how much of a helical would be good for an uplink? I can search for existing designs or possible do the cad to enable reliable replication. **
Gareth
*** And the great news is that it seems unaffected. 1 minute in a 800 watt microwave with a cup of water, plastic came out stone cold. So it seems suitable for RF....how much of a helical would be good for an uplink? I can search for existing designs or possible do the cad to enable reliable replication. **
Gareth
Re: ATV on 6cms - It's Cheap and Easy on 5665MHz
Sounds good. There'll be some dielectric effect, so the bare minimum of supporting framework would be best.
There's some info here on a helical feed for offset dishes: http://www.g6lvb.com/60cm.htm
Around 5 turns seems to be optimum, but if the framework could support 6 turns, it would allow for experimentation. I wonder if it could be made so that it could attach to the standard 40mm LNB holder?
There's more info here, including a design for prime focus dishes: http://www.w1ghz.org/antbook/conf/Helic ... tennas.pdf
ISS and Es'hail-2 use RHCP, so the helical feed should be left hand to allow for the reflection off the dish face: anti-clockwise when viewed from behind the ground plane.
Brian
There's some info here on a helical feed for offset dishes: http://www.g6lvb.com/60cm.htm
Around 5 turns seems to be optimum, but if the framework could support 6 turns, it would allow for experimentation. I wonder if it could be made so that it could attach to the standard 40mm LNB holder?
There's more info here, including a design for prime focus dishes: http://www.w1ghz.org/antbook/conf/Helic ... tennas.pdf
ISS and Es'hail-2 use RHCP, so the helical feed should be left hand to allow for the reflection off the dish face: anti-clockwise when viewed from behind the ground plane.
Brian
Re: ATV on 6cms - It's Cheap and Easy on 5665MHz
Weather radar stations on 5.6GHz.
Select Band=C and Country=United Kingdom and click on the dot at the centre of the circle to get the frequency. It might explain some de-sensing if you're near one or beaming at one.
Brian
http://eumetnet.eu/wp-content/themes/ae ... index.html
Select Band=C and Country=United Kingdom and click on the dot at the centre of the circle to get the frequency. It might explain some de-sensing if you're near one or beaming at one.
Brian
http://eumetnet.eu/wp-content/themes/ae ... index.html
Re: ATV on 6cms - It's Cheap and Easy on 5665MHz
need recommendations for an sd card reader WITH AV output - all I can find are usb ones - any ideas please ?? - or types to look out for on flea bay or I am a zonion ………………. thanks
NO idea is too crazy so long as one fool believes they can make it work
Re: ATV on 6cms - It's Cheap and Easy on 5665MHz
Hi,
Try media player in your search; there are loads about and it's what I use.
https://www.ebay.co.uk/itm/Full-HD-1080 ... SwUchaBB~n
73 Steve
Try media player in your search; there are loads about and it's what I use.
https://www.ebay.co.uk/itm/Full-HD-1080 ... SwUchaBB~n
73 Steve
Find me on D Star through GB7BP