Hi Herb.

Unfortunately bandpass filters rated at full output power with that spec are usually big and hence expensive.

Although a compromise, a decent design of high pass filter and low pass filter would be cheap less than 1/10th the price and have a loss of 0.2dB.
Maybe the 2m followed by a low pass and a High pass in front of the 70cm. ?

73  David


-----Original Message-----
From: Herb Sims <herb.sims@mchsi.com>
CC: amsat-bb@amsat.org
Sent: Thu, 10 Jun 2021 14:32
Subject: [AMSAT-BB] Re: BPF for 2m and 70cm?

What I am looking for is a BPF that has very low insertion loss (<0.5dB) and is low cost.  I can find BPFs with those specs but they are $300+ each and I need one for both bands….a little pricey…. I thought hams were cheap :)

The SMT parts are high insertion loss so that’s no better from a noise figure standpoint than what I have now (-3dB for coax loss).

The cost is what I’m having problems with. I realize that these BPFs are special…I’m just looking for a better cost bogey.

Thanks,

Herb


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