EMRFD Message Archive 893
Message Date From Subject 893 2007-07-10 23:35:08 brainerd@wildblue... BPF Board I received messages from a couple of Europeans that DigiKey charged really high handling
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
894 2007-07-11 04:32:38 w4zcb77 Re: BPF Board 895 2007-07-11 09:25:25 brainerd@wildblue... Re: BPF Board On 11 Jul 2007 at 11:32, w4zcb77 wrote:
> > 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.
the BPF page. Select "measurements" from the left. There are two sets of
measurements done by 2 different people.
Dave - WB6DHW
896 2007-07-11 10:07:35 Joe Rocci Re: BPF Board 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) All filters/switches off2) Each individual filter/switch onAmplitude scale for all graphs should be 10 dB/div. Phase is probably not significant for most applications this would be used in.JoeW3JDR----- Original Message ----- 903 2007-07-14 10:06:10 brainerd@wildblue... Re: BPF Board On 11 Jul 2007 at 13:06, Joe Rocci wrote:
> 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.
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
Dave - WB6DHW