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| To: | [email protected] |
|---|---|
| Subject: | LF: Re: J310 IMD figures |
| From: | "Jay Rusgrove" <[email protected]> |
| Date: | Thu, 2 Feb 2006 07:54:14 -0500 |
| Delivery-date: | Thu, 02 Feb 2006 12:55:25 +0000 |
| Envelope-to: | [email protected] |
| References: | <000701c62720$be51b3a0$6401a8c0@JAYTERMINAL> <[email protected]> <[email protected]> <[email protected]> <000901c627ec$a44d91f0$2201a8c0@pcroelof> |
| Reply-to: | [email protected] |
| Sender: | [email protected] |
|
Roelof
Had an opportunity to build 6 of the
Amrad CP666 e probes (for a military customer) a while back
and measured the following. First column is measurments from the QST
article, second column is measurment average of the 6 antennas built
(all measured within a dB or so of each other), third column Amrad
circuit with single J310 at 12 volts and fourth column single J310 at 24 volts.
Measured significantly higher IP2 than the original
article leading me to believe there might have been a measurement error in the
original article...or I got a batch of CP666s that were unusally good
performers. The fact that the J310 at 12 volts achieved +50 dBM makes me
lean toward possible measurement error in the original
article.
Hope these columns stay lined up when passing
through the reflector!
Amrad article W1VD
built J310
12volt J310 24
volt
1 dB comp. +25 dBm +25 dBm +17 dBm +18 dBm IP2 +53 dBm* +60 dBm +50 dBm +60 dBm IP3 +37 dBm +36 dBm +32 dBm +32 dBm Gain
-16.7
dB -16.5
dB
-10
dB
-10 dB
* possible measurement error
Jay, W1VD
----- Original Message -----
From: "Roelof Bakker" <[email protected]>
To: <[email protected]>
Sent: Thursday, February 02, 2006 6:34
AM
Subject: LF: J310 IMD figures > > Thanks to Andre Kesteloo for forwarding the update on the AMRAD active whip > design and pleased to see that the CP666 is still available. > > Regarding the advice for substuting the CP666 for a J310 and the quoted > second and third order IMD figures, I have measured these and found IP2 = + > 65 dBm and IP3 = + 30 dBm. At 12 volt the J310 should be biased for 10 -12 > mA, excellent for battery operation. These figures are in the same league as > for the CP666 and I am tempted to purchase one and find out if there is any > difference in practice. > > Best regards, > > Roelof Bakker, pa0rdt > > |
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