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All: Filters are among the easiest items of use one can design and build. A good free application for filter design on your PC is the following: http://tonnesoftware.com/elsiedownload.html All of my

I mentioned this before but apparently some folks didn't read the message. https://kitsandparts.com/store2.php?? shows over 300 of the 2SC5551 in stock. Note you have to click "Place Order" to find

Thanks for the info, Martin 73 W6CJ [email protected]> wrote:

Steve, Thanks for those filter companies. 73 Jay W6CJ wrote:

Do you really mean 10Hz, or actually mean 10kHz ? I regularly hear stuff down to 10kHz on my Tarsk active whip, and sometimes even on an LZ1AQ broadband loop. But no chance of going much lower in

I don't know of any broadband loop amps that only receive 10-500 kHz. One could probably build a tunable loop over that range. Folks normally use an LF low pass filter (LPF) if overloading of the

I'm wondering about active, receive-only outdoor loops for 10-500 Khz... Seems to me that one way to keep powerful medium-wave (AM) broadcast from causing IM in a loop antenna amp or receiver is to

Hi Rick All noted Thanks Simon g0zen

You can often tame a high Ft transistor by putting a small (say 10 pF) capacitor directly from the emitter to the collector. Another trick is to put a small resistor in series with the collector.

You've got it, Evertt!!! Addressing the list of tested devices on this group and according to DIGIKEY this afternoon: BFR106 is OBSOLETE BFQ18A is OBSOLETE BFR106: $ 0.49 each in 1-qty ft = 5 GHz NF =

I don't have to worry about either, as I have well over 1000 of the 2SC5551s and well over 400 of the 2N5109s and about 30 of it's complementary 2N5160s. When you know something is good buy a good

All this does not bode well for the 2SC5111 continued existence. It's well on its way of the 2N5109. I will search for an equivalent. Dave - W?LEV wrote: -- *Dave - W?LEV* *Just Let Darwin Work*

Sometimes semiconductor companies list a product, but do not make it - ?because the demand is too small. ?When a large order is placed, then they make the part. ?I experienced this years ago with

Steve..that sounds bad.. was just saying what I had heard on this group.. I don’t give a **** where you from, USA, Canada, Uk etc , ( just cos Martin English don’t mean nothing.) just trying to

Mouser.com gives an online quote for OnSemi 2SC5551 as 2000 minimum quantity for $900 (45 cents/each), with a minimum 25 week lead time, so apparently OnSemi is hoping to manufacture some more in the

Onsemi shows that it's still an active device in their system: https://www.onsemi.com/products/discrete-power-modules/rf-transistors/2sc5551a

So, evidently, it, as well, has gone the way of the 2N5109. Any suggestions on an equivalent / replacement of current manufacture? HUNTER: Thanks for the EvilPay reference. I don't trust anything

Available on evilBay:

Thank you ( so just basic stuff, no need to change any biasing etc.) Simon g0zen

I found two more transistors to test, these have been added--BFP196; Motorola PN2222A "820". ZTX327 ? -89 dBm ???????? +10.58 dB, 1.16 NF