EMRFD Message Archive 893
Message Date From Subject 893 2007-07-10 23:35:08 brainerd@wildblue... BPF Board
and shipping for the parts. I have added parts lists from Mouser and Farnell-UK to my multi-
source BOM. That is accessible from the BPF page by selecting the multi-source tab on the
left. The format is an Excell spreadsheed. Each supplier is on a different sheet.
If someone knows a good on-line supplier for our friends overseas please let me know and I
will develop a parts list for that source. I know several in Europe have mentioned Farnell.
But, they do have minimums on the smd caps, inductors, and resisters.
Dave - WB6DHW
<http://users.wildblue.net/wb6dhw>894 2007-07-11 04:32:38 w4zcb77 Re: BPF Board 895 2007-07-11 09:25:25 brainerd@wildblue... Re: BPF Board
> > Dave - WB6DHWI posted some measurements on my website that I think show that. Go to
> > <http://users.wildblue.net/wb6dhw>
>
> Dave, I inquired before but have not seen a response. Could you give
> the results of a test of your board for at least one filter built on
> it to include center frequency, bandwidth to 3 dB points, Insertion
> loss, passband ripple and ultimate rejection please. I'd be very
> interested to know what I was building was going to satisfy my
> requirements after having built it. I have built several discrete
> SMD filters (For a very low frequency) and been quite disappointed
> at what could be obtained with inductors of such low Q.
>
> Regards
> W4ZCB
> >
the BPF page. Select "measurements" from the left. There are two sets of
measurements done by 2 different people.
Dave - WB6DHW
<http://users.wildblue.net/wb6dhw>896 2007-07-11 10:07:35 Joe Rocci Re: BPF Board 903 2007-07-14 10:06:10 brainerd@wildblue... Re: BPF Board
>Joe:
> These look like narrow-band sweeps of individual filters. What's needed are a series of wideband
> sweeps (1-60 MHZ ?) of the whole system showing insertion loss &return loss with:
>
> 1) Allfilters/switches off
> 2) Each individual filter/switch on
>
> Amplitude scale for all graphs should be 10 dB/div. Phase is probably not significant for most
> applications this would be used in.
>
> Joe
> W3JDR
I have asked Terry if he can get some more data. If not, I will get a
production board together and run them when I finish the 995x production
board layout.
Dave - WB6DHW
<http://users.wildblue.net/wb6dhw>