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Re: SAW Filter limitations
Is it possible to use two narrower filters switched for the high and low end of the band?
Dave
KA2OQZ
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Is it possible to use two narrower filters switched for the high and low end of the band?
Dave
KA2OQZ
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By
kdcarlso@...
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#612
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Re: SAW Filter limitations
Thanks to all who contributed.
We have a couple of inquiries in for custom filters, the NRE looks reasonable.
In the mean time we'll move forward with the current design and plan on a UDRX-430 for
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Thanks to all who contributed.
We have a couple of inquiries in for custom filters, the NRE looks reasonable.
In the mean time we'll move forward with the current design and plan on a UDRX-430 for
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By
bhhoyer@...
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#611
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AW: SAW Filter limitations
What about using a highpass with about 400 megs?!?
Dg9bfc
Sigi
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What about using a highpass with about 400 megs?!?
Dg9bfc
Sigi
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By
"siegfried jackstien" <siegfried.jackstien@...>
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#610
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Re: SAW Filter limitations
The filter is required to suppress carrier feedthru on the TX side in the 350-380 range (Fc-IF). On the receive side it's a nice to have.
We are working towards commercial certification, so some of
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The filter is required to suppress carrier feedthru on the TX side in the 350-380 range (Fc-IF). On the receive side it's a nice to have.
We are working towards commercial certification, so some of
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By
bhhoyer@...
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#609
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Re: SAW Filter limitations
Also, I’m an “appliance operator” so I don’t understand the purpose of the
filter. But I wonder why the radio would have a limitation that other
amateur radios in the 440 band don’t have.
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Also, I’m an “appliance operator” so I don’t understand the purpose of the
filter. But I wonder why the radio would have a limitation that other
amateur radios in the 440 band don’t have.
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By
"Michael E Fox - N6MEF" <n6mef@...>
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#605
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Re: PNW digital network
By
gary.k7ek@yahoo.com <gary.k7ek@...>
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#606
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SAW filters
In Canada, band starts at 430mhz.
Doug, ve7ept
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In Canada, band starts at 430mhz.
Doug, ve7ept
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By
James D Steventon <ve7ept@...>
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#607
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AW: PNW digital network
Seems the same thing (or nearly) like the "hamnet" we have here in europe
Tcpip based high speed network
Dg9bfc
Sigi
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Seems the same thing (or nearly) like the "hamnet" we have here in europe
Tcpip based high speed network
Dg9bfc
Sigi
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By
"siegfried jackstien" <siegfried.jackstien@...>
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#608
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Re: SAW Filter limitations
This view is probably heretical, but here goes.
The US band plan is largely an accident of a lot of spectrum chasing a small use base, adopted in a very different time, assuming very different
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This view is probably heretical, but here goes.
The US band plan is largely an accident of a lot of spectrum chasing a small use base, adopted in a very different time, assuming very different
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By
Steve Stroh N8GNJ <steve.n8gnj@...>
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#602
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Re: SAW Filter limitations
In Northern California, packet and other data activity is in the 433, 434 and 438 range, with wideband channels in the upper of those two ranges. This is where we would intend to use the device.
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In Northern California, packet and other data activity is in the 433, 434 and 438 range, with wideband channels in the upper of those two ranges. This is where we would intend to use the device.
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By
"Michael E Fox - N6MEF" <n6mef@...>
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#603
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Re: PNW digital network
What does equate to as far as hertz
Sent from Yahoo Mail on Android
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What does equate to as far as hertz
Sent from Yahoo Mail on Android
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By
"flightresq@..." <flightresq@...>
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#604
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Re: PNW digital network
<flightresq@...> wrote:
Not really sure what this has to do with the current thread, but...
P25 Phase I is 4800 symbols per second - where each symbol encodes two
bits of data for a raw bit rate of
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<flightresq@...> wrote:
Not really sure what this has to do with the current thread, but...
P25 Phase I is 4800 symbols per second - where each symbol encodes two
bits of data for a raw bit rate of
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By
Tom Hayward <esarfl@...>
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#601
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Re: PNW digital network
Does anyone know the baud rate or hertz for project 25?
Sent from Yahoo Mail on Android
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Does anyone know the baud rate or hertz for project 25?
Sent from Yahoo Mail on Android
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By
"flightresq@..." <flightresq@...>
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#600
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Re: PNW digital network
Have you seen HamWAN? http://www.hamwan.org There are some
differences of vision here but in general the HamWAN folks are doing a
heroic job.
That said, I'm hoping to see a robust wide area ad-hoc
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Have you seen HamWAN? http://www.hamwan.org There are some
differences of vision here but in general the HamWAN folks are doing a
heroic job.
That said, I'm hoping to see a robust wide area ad-hoc
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By
Bill Vodall <wa7nwp@...>
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#599
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Re: PNW digital network
I'm waiting too.. I'm trying to setup a BBS in New Westminister, BC. I'm having issues with TNC not wanting to talk to BPQ. Issue with com ports on windows XP. Not know Linux. I'll need all the help I
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I'm waiting too.. I'm trying to setup a BBS in New Westminister, BC. I'm having issues with TNC not wanting to talk to BPQ. Issue with com ports on windows XP. Not know Linux. I'll need all the help I
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By
Don Poaps <va7dgp@...>
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#598
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PNW digital network
Back in the mid 90s, when packet radio was well established in the
PNW, Vancouver Island, the B.C. mainland, and the Puget Sound area
was well served by a network of nodes and BBSs. The 1200
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Back in the mid 90s, when packet radio was well established in the
PNW, Vancouver Island, the B.C. mainland, and the Puget Sound area
was well served by a network of nodes and BBSs. The 1200
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By
ve7dhm@...
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#597
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Re: SAW Filter limitations
Hi Steve,
Currently, the only DD network implementation is 128 kbps on 23 cm from Icom (ID-1 terminals, and RP-2D access point) and is half duplex (no repeaters). The UDRX will change this, as it
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Hi Steve,
Currently, the only DD network implementation is 128 kbps on 23 cm from Icom (ID-1 terminals, and RP-2D access point) and is half duplex (no repeaters). The UDRX will change this, as it
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By
"John D. Hays" <john@...>
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#596
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Re: SAW Filter limitations
How does this discussion affect digital voice (DV) and digital data (DD) modes in the USA? Do DV repeater operators always enable DD capability? Or, are there separate DD repeaters? Do the repeater
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How does this discussion affect digital voice (DV) and digital data (DD) modes in the USA? Do DV repeater operators always enable DD capability? Or, are there separate DD repeaters? Do the repeater
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By
Steve <yahoo-udr@...>
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#595
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Re: SAW Filter limitations
We could do a UDRX-430.
there is a 20MHz 431 Filter (421-441). Takes care of the bottom of the US Band as well
It's in a different package (of course) so we'd end up building 440s in mass then
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We could do a UDRX-430.
there is a 20MHz 431 Filter (421-441). Takes care of the bottom of the US Band as well
It's in a different package (of course) so we'd end up building 440s in mass then
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By
bhhoyer@...
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#594
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Re: SAW Filter limitations
It is a similar situation here in Ireland, and I guess throughout all of IARU Region 1.
Regards
John
EI7IG
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It is a similar situation here in Ireland, and I guess throughout all of IARU Region 1.
Regards
John
EI7IG
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By
John Ronan <jpronans@...>
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#593
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