>”Need, want....whatever. What single ham would ever use 100 of them and make the supply problem even worse for others? That's my point.” The distributor invokes the incentive to purchase in quantitie

See attachment of my Mouser shipping options. It shows the USPS Economy option. Paul, W9AC

Roy, I did notice that I do not get the low USPS pricing until fully logged in. I’m a high volume purchaser and often get free 2-day UPS shipping with notice after the order. So, it’s possible that th

At the final invoicing phase, just before submitting the order, more shipping options appear. I just tried it and it does indeed show a USPS First Class option of $3.49. Paul, W9AC

Fairchild/OnSemi BS170 MOSFETs are back in stock at Mouser. 49,189 as of this morning. I placed an order for 100 over the weekend and got a 50% price break over small quantities. USPS First Class ship

Nice work gents… Ron, where did you source the die-cast aluminum enclosures? It would be great to include an OEM part number too. Paul, W9AC

My list of suspects starts with Q3 through Q6, followed by diodes D4, D5, and D6 although the 1N4007 is a very robust 1KV diode and generally not susceptible to static damage. Based on the schematic,

I modeled the ZS6BKW using NEC 4.2 using the specified antenna and line lengths, and assumed a 30 ft flattop height over average ground, which is probably attainable in many portable conditions. Gener

>"Mouser USA is reporting 68,000 BS170 (through hole TO92) and still in stock..." Mouser is currently out-of-stock on all BS170. What you're seeing is the amount on order from the OEM and the expected

Hans, For the contest, how did you cool the 2N2222s? The rules appear to allow much flexibility. Also, did you use plastic-encapsulated TO-92 transistors or TO-18 with a metal can? Paul, W9AC

>A source of <<Za=312,69 ohm -j325,52 connected to a load with >>Ze=227ohm +j521 results in an SWR of 1:2,19 Wolfgang, I believe we are both correct (or at least our software is!) and only the present

>"guess this is a typo: "227+j521 = 29:1 SWR (50) on 20m"" Wolfgang, On your diagram, the impedance looking into your load shows a value of 227+j521 with SWR = 2.19:1. Normalized in a Z=50 system, I g

70 cm? In the example Wolfgang provided, a load impedance of 227+j521 = 29:1 SWR (50) on 20m. Add in 3m of RG-58 coaxial cable between the T network and load, and we have loss on 20m in addition to th

On Fri, May 13, 2022 at 03:36 AM, Roelof Bakker wrote: "These calculations are not correct as the source impedance (your transmitter antenna port) is not 50 ohm. It must be connected to a 50 ohm load,

Wolfgang, That’s a nice modeling presentation. What software is used? Paul, W9AC

>”How does that compare to the coax losses you would expect from a dipole?” And I thought I was done posting. Here goes… I don’t use coax on my multiband dipoles. Either 400 or 600-ohm homemade open-f

I'll end my commenting with this... No doubt you understand the EFHW's limitations, but unfortunately some manufacturers are touting it as the Holy Grail of multiband antennas and many gullible new op

>”The results are below, a small MFJ Travel Tuner was required on some bands only... The test was made using WSPR @ 5w.” I don’t want to diminish anyone’s enjoyment who use an EFHW antenna, but the re

>”The purpose of an antenna tuner circuit is to match impedance.” Although I prefer L networks in nearly all antenna matching cases, they can’t be used to independently adjust phase through the networ

What’s not discussed is the wide SWR bandwidth measurement relative to the NEC model. Worse is the compensated model that shift the 10m frequency to get low SWR in-band. Bu,t that occurs as a result o