I am in the opinion that a LPF like that at 50usd is overpriced. Toroids seem small, what about the capacitors? Are these ceramic or silver-mica, rated at what voltages? You may have a look to http://www.communication-/fl1-15/,? the manuals are instructive.
Il 16/mag/2019 04:09, "Joe Puma" <
kd2nfc@...> ha scritto:
Hey Curt,
So I got the amp assembled but without a filter. Tests look good into a dummy load. On a antenna for just a brief keyup my turner couldn¡¯t keep the swr low at all. It kept tuning. Any thoughts? I read that blog where he mentioned a resistor change to get better swr and make the amp more stable. I¡¯m sure not having a filter is playing a role here too.?
Joe
Kd2nfc?
On May 14, 2019, at 7:36 PM, Joe Puma via Groups.Io <
kd2nfc@...> wrote:
Thanks Curt. Okay that¡¯s the filter I was going to get as well. I also saw the blog where the blog suggested to increase bias voltage. I am also waiting for a similar sized heatsink too, next will be a case for the filter and amp.?
Joe
On May 14, 2019, at 4:08 PM, Curt M. <
Kc3hjp@...> wrote:
Hi Joe,?
The filter set that Oliver has listed above is the one that I am using.? They used to be $50 or so which in my opinion was overpriced especially compared to what they are now.? I mounted mine filters in an aluminum enclosure with a switch on the front to select the individual bands.? Be sure to get yourself a fan to mount on the side of the heatsink.? Tehy ahve convienently pit a connector on the board to power the fan.
Here is an old picture of mine while I was still in the testing stages and before I mounted the fan on the side.? There is a heatsink and fan available on ebay that fits the board perfectly.? I also made a PTT cable up for when I use it with the FT-817ND.
Curt M.
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