Thanks for all the great replies both on and off thread WRT my MFJ-259 (not B model) and some suggestions for a new analyzer. I think I have it narrowed down, but have a question. Will a simple filte
I purchased one of the ICE filters and the performance does NOT meet the published curve. Many dB off. It does provide some filtering. The performance is OK considering the price. However, whether a
VE9AA: analyzer would not be enough to overpower the components??? Anyone have a suggestion of a CHEAP filter? If I am shelling out $500++ for an analyzer, I don't want to spring another $100-$200 fo
Rick, There are several USB interfaces for the N2PK VNA; I guess it's the most popular interface used with that design now. I built mine with USB from the start, and I love it. 73, geo - n4ua --Origi
This has the same problem as the ICE filter. An impressive looking measured curve, but no guaranteed specs. Having built many filters, I can tell you that repeatability is a huge issue in the case of
Contact the owner Dale Parfitt W4OP. Dale can tweak the #3 null in the response shown to exactly reject 1700 kHz. Poke around on his website...it might give you a little more confidence he knows what
Mike, Looking at the response of the 402/402x filter, I really wonder if it works as good as it looks. The response appears to be flat down to about 1.7MHz, then it turns the corner and falls off a c
What about W3NQN's filters? http://www.arraysolutions.com/Products/BCB%20RF%20Filters.htm Jim N7US _______________________________________________ Topband mailing list Topband@contesting.com http://l
As I said weeks earlier in this thread..my Par BCB filter works great. My BCB attenuation measurements are per his specs on my swept SA. The BC band falls off a cliff below 1800. Is it perfect? Of co
Author: "Michael St. Angelo" <mstangelo@comcast.net>
Date: Fri, 16 Oct 2009 20:12:18 -0400
Rick, Telepost makes a Digital Vector Wattmeter, model LP-100A, that also measures complex impedances when you transmit. If you can get your hands on one of there you can try it. Mike N2MS -- Origina
I need to know the complex impedance of the antenna, not the impedance at the transmitter. I don't believe the telepost system calibrates out cables. Also, my transmitter is 900 feet from my antenna,
Rick impedance at the transmitter. We have few available options. I am using the LP-100 for several years and I love it. To know the impedance at the antenna there are several programs to help with.
Author: "Michael St. Angelo" <mstangelo@comcast.net>
Date: Sat, 17 Oct 2009 15:24:42 -0400
Rick, 900 feet? What type of coax are you using? You could probably cancel out the coax by using a VNA like the AIM4170 of N2PKVNA and performing a OSL calibration at the antenna end. You would get l
Open wire line, 4 AWG aluminum, 450 ohms. A few .1 dB's of loss on 160. Yes, the AIM4170 can calibrate out both the 160 meter BCB filter and the open wire line, including baluns at each end and resid
Author: "Michael St. Angelo" <mstangelo@comcast.net>
Date: Sat, 17 Oct 2009 16:22:15 -0400
Rick, I've used my LP-100 and FT-817 to measure the antenna impedance at the base of my 160 inverted L. I run both from a 12 volt battery. I've also used my N2PKVNA and Laptop but the LP-100/FT-817 c
That procedure is actually reasonable. I have an IC-706 and gel cell for that. Due to the power level involved, no 160 meter filter is necessary, no calibration, etc. Rick N6RK ______________________
Hi Rick, If your antenna is within wifi range of your shack, you could try running the laptop to remotely control the AIM4170, which remains in the shack. Full details here: <http://homepage.ntlworld
Hi Rick, If your antenna is within wifi range of your shack, you could try running the laptop to remotely control the AIM4170, which remains in the shack. Full details here: <http://homepage.ntlworld
I use sections of RG6 to remote the AIM4170, principally to tune parasitic devices in place. One caution doing that is to put a good common mode choke at the remote end, and recalibrate the remote wi