, W3TMZ
- Original Message - From: Jack Smith
[EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Cc: elecraft@mailman.qth.net
Sent: Wednesday, July 30, 2008 6:48 PM
Subject: Re: [Elecraft] Re: K3 6m pre-amp
Don:
The U310's are not too easy to find these days. Vishay seems to be the
most common
Oh well a cavity design might not be the way to go on 6m,
it might get a bit too big when I think about it.
A very low NF isn´t needed in the first place. There are
a ton of transistors that can be used, after all it´s
only 50 MHz.
/SM2EKM
--
Jan Erik Holm wrote:
Or BF981 would work
PROTECTED]
To: Jack Smith [EMAIL PROTECTED];
[EMAIL PROTECTED]
Cc: elecraft@mailman.qth.net
Sent: Wednesday, July 30, 2008 4:37 PM
Subject: Re: [Elecraft] Re: K3 6m pre-amp
I personally would use a MGF-1302.
73
Jack, W3TMZ
___
Elecraft mailing list
Yes, I have a number of 2N5109s. I use them
in my HF preamps.
Thanks, Jan Erik.
73, Bob N6WG
- Original Message -
From: Jan Erik Holm [EMAIL PROTECTED]
Cc: elecraft@mailman.qth.net
Sent: Thursday, July 31, 2008 4:38 AM
Subject: Re: [Elecraft] Re: K3 6m pre-amp
MGF1302 is a GaSFet
Note that I installed this preamplifier in the RX IN/OUT path on the K3
rear panel
To enhance the 6 meter performance of my K3 I built the U310
preamplifier as described on N6CA's website:
http://www.ham-radio.com/n6ca/50MHz/50appnotes/U310.html
Tuned up on an HP8970A noise figure meter
, July 30, 2008 10:56 AM
Subject: [Elecraft] Re: K3 6m pre-amp
Note that I installed this preamplifier in the RX IN/OUT path on the
K3
rear panel
To enhance the 6 meter performance of my K3 I built the U310
preamplifier as described on N6CA's website:
http://www.ham-radio.com/n6ca/50MHz
Bob,
While I cannot speak from my own measurements, but in EMRFD, Wes Hayward
recommends the U310s for VHF/UHF rather than the J310. The case of the
U310 is connected to the gate, and when used in a grounded gate
configuration, the case can be mounted (upside down) into a hole in the
PC
Don:
The U310's are not too easy to find these days. Vishay seems to be the
most common (only?) new production supplier and the one-off price is
about $14 from Mouser or Arrow. Digikey, Allied and Newark only stock
the SOT23 plastic surface mount version. TO-92 plastic case parts, the
J310,
Jack,
I understand the vanishing part syndrome. I have a few remaining in my
parts bin, and I am not about to give them up (similar feelings about my
dual gate MOSFETs).
As an alternative to the U310, when laying out a PC board (or Manhatten
construction board), one might consider the SMD
I personally would use a MGF-1302.
73
Jack, W3TMZ
- Original Message -
From: Jack Smith [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Cc: elecraft@mailman.qth.net
Sent: Wednesday, July 30, 2008 6:48 PM
Subject: Re: [Elecraft] Re: K3 6m pre-amp
Don:
The U310's are not too easy to find
I'm using J310 parts in a VLF-LF-MF-HF active antenna design I'm working
on, no need to go to the U310 version at those frequencies.
I've found best intermodulaton performance in the active antenna
requires 25 - 35 mA idle current with 8-10 volts source-drain, so
there's some advantage in
PM
Subject: Re: [Elecraft] Re: K3 6m pre-amp
I personally would use a MGF-1302.
73
Jack, W3TMZ
- Original Message -
From: Jack Smith [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Cc: elecraft@mailman.qth.net
Sent: Wednesday, July 30, 2008 6:48 PM
Subject: Re: [Elecraft] Re: K3 6m pre
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