The ferrite loaded mast cable is obviously there for common mode rejection. As
such, the CM can only be sourced form unbalanced baluns at the antenna, or
from the imbalanced complex impedance variance caused from the mutual
inductance of the antenae over the ground plane.
An antenna expert such as
A1. Since concrete is partly conductive and varies with mositure content and
ambient conditions, the reflected path with vary substantially. The solution
is to place a screen mesh over the top of the concrete.
A2. The specified size is that of the elipse which is 2d by root3d. A
practical size is
There is a round of voting ongoing at this time for a new set of CISPR 22
limits for measurements above 1GHz. They are rumoured to be quite interesting
and substantially different from anything the FCC has been doing for years,
including the required anechoic chamber (vs semianechoic most of us
---BeginMessage---
when using a log value, A +/- xdB, the tolerance is a percentage of value A
rather than an absolute range independent of A. Makes sense to me!
Hans
---End Message---
I have encountered certain European agencies requesting that not only are the
conducted emissions required to be performed at 230V 50Hz but radiated
emissions as well. I agree that for conducted emissions it may make a
difference but I have not seen radiated emissions change when the power source
Tantalums give you the advantage of a high Capacitance per unit volume. Their
reliability is proportional to the applied voltage versus rated voltage,
operating temperature versus rated temperature and power dissipation
(Vripple*2*pi*f*C)
The do most often fail in a short circuit. They should be
This M-G set is located in Santa Clara CA USA. Shipping costs are anticipated
to be high.
Hans
If anyone is in need of a 150KVA 3-phase Motor-Generator Set please contact me
for details.
Hans Mellberg
What if the little green Italian sports car, happened to resonate at 433. MHz?
And, with a reasonable Q? Then, your weak 3rd harmonic, will retransmit from
the sports car and your receiver will pick it up. I contend that it is your Tx
output filter that is not performing. Do a conducted emissions
There used to be a special plastic shoulder washer used in exactly this
application (The washer has a crossection resembling the letter T). This
solved the clearance and creepage problem. It fits inside the hole of the
TO-220.
Hans
In general reliability terms, one connector is better than two. But, if the
lack of connector allows for warpage and hence, reduced contact pressure at
certain locations, then it is a toss-up. Secondly, without the use of the
second connector, the pad contact material becomes significantly
Correction: It is held next door at the Westin Hotel, not at the Convention
center. (about 100 yards/meters walking distance between the two)
To unsubscribe from si-list: send e-mail to majord...@silab.eng.sun.com.
In the BODY of message put: UNSUBSCRIBE si-list, for more more help, put
A one day Colloquium and Exhibition on 1 June 1998 at the Santa Clara
Convention Center, Santa Clara CA. 7:30 am to 5:00 pm.
Sponsored by the IEEE EMC chapter of the Santa Clara Valley.
Fee required for attendance,
All welcome,
visit our web site for details at:
www.scvemc.org/emc98/
Topics
The best way to design a filter is to establish the performance criteria
first.
Determine the source impedance
Determine the load impedance
Determine the attenuation required and at what frequency
Determine the roll-off required
Now you can determine what order filter you need and whether it is
14 matches
Mail list logo
