70cm SAW filter
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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
70cm SAW filter
Has anyone used this (or similar) on receive in conjunction with a MiniTiouner?
https://www.ebay.co.uk/itm/70cm-430-440 ... 4003655576
I'm thinking this is, although better than nothing, probably a tad too wide, as I live in a pretty RF congested area.
https://www.ebay.co.uk/itm/70cm-430-440 ... 4003655576
I'm thinking this is, although better than nothing, probably a tad too wide, as I live in a pretty RF congested area.
Re: 70cm SAW filter
Hello,
I use this filter for transmission mode after a LimeSDRMini or a Pluto, but not with a MiniTiouner. Its bandwidth is acceptable to filter 437MHz harmonics but not disturbing signals around 437 MHz.
Jean-Pierre F6DZP
I use this filter for transmission mode after a LimeSDRMini or a Pluto, but not with a MiniTiouner. Its bandwidth is acceptable to filter 437MHz harmonics but not disturbing signals around 437 MHz.
Jean-Pierre F6DZP
Re: 70cm SAW filter
Hi Jean-Pierre
How does the group delay vary across the bandwidth?
Mike
How does the group delay vary across the bandwidth?
Mike
Re: 70cm SAW filter
Interesting question but I have not look at the group delay for this chip, just use it only for low SR and low level. I have not observed any difference with the signal other than 2dB loss, so go further without studying the group delay.
This is a TA1408A
You can find the datasheet here:
https://www.golledge.com/media/2551/mp04694.pdf
You can buy this chip by 5 units on AliExpress website
https://www.aliexpress.com/item/Origina ... 44173.html
Jean-Pierre F6DZP
This is a TA1408A
You can find the datasheet here:
https://www.golledge.com/media/2551/mp04694.pdf
You can buy this chip by 5 units on AliExpress website
https://www.aliexpress.com/item/Origina ... 44173.html
Jean-Pierre F6DZP
Re: 70cm SAW filter
I Use
https://www.ebay.co.uk/itm/450-Mhz-Heli ... ctupt=true
in front of my minituner when not using the mhp which has onboard helicals. Tunes 430-440Mhz without issue
Dave
G4FRE
https://www.ebay.co.uk/itm/450-Mhz-Heli ... ctupt=true
in front of my minituner when not using the mhp which has onboard helicals. Tunes 430-440Mhz without issue
Dave
G4FRE
G4GHD wrote: ↑Tue Feb 05, 2019 10:29 pmHas anyone used this (or similar) on receive in conjunction with a MiniTiouner?
https://www.ebay.co.uk/itm/70cm-430-440 ... 4003655576
I'm thinking this is, although better than nothing, probably a tad too wide, as I live in a pretty RF congested area.
Re: 70cm SAW filter
I have something similar in a Habamp, an LNA designed for high altitude balloon reception - which I use for DATV on 70cms.
See https://store.uputronics.com/index.php? ... duct_id=53
for a more recent implementation.
Mike
See https://store.uputronics.com/index.php? ... duct_id=53
for a more recent implementation.
Mike
Re: 70cm SAW filter
Thanks for the comments and suggestions
Re: 70cm SAW filter
Some in EA3 we are using with minitiouner and with good results this:
https://www.tindie.com/products/gpio/43 ... bandwidth/
https://www.tindie.com/products/gpio/43 ... bandwidth/
73, Juan EA3TA
Re: 70cm SAW filter
I've used this one in the past in several 70cm projects: https://nl.mouser.com/ProductDetail/ABR ... jkZw%3d%3d