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The discussion on dummy loads got me thinking of resistive SWR bridges. Would be good to include an SWR meter as part of a basic uBitx test set. Here's a resistive bridge that I like:

Gerard you won't notice much difference on receive if you move the xtal frequency.? this change is to reduce the transmit spurious on certain bands.? and these bands are higher in the spectrum, and

Motor oil is slightly acidic.. .you don’t want to use it. Sent: Sunday, November 1, 2020 5:18 PM To: [email protected] Subject: [BITX20] Dummy Load Resistors & Motor Oil Motor oil might be good for

If the SWR doesn't change much for your resistor(s) when you dunk them in the motor oil,?it should be fine.? ?Worth experimenting. My primary concern would be that motor oil is much more

Motor oil might be good for high temperatures but what are its electrical properties? I believe most motor oils have a corrosion inhibitor, a wear inhibitor and some kind of detergent. There are

Flash point is about 280F so smoke point would be lower… Sent: Sunday, November 1, 2020 4:37 PM To: [email protected] Subject: Re: [BITX20] Dummy Load Resistors Hello, That’s a great point. What is

You can get mineral oil at the drug store and it: 1) has higher heat capacity than either of the two you suggested, and 2) is inert. You can also pour what’s left into the traps of the drains in

Hello, That’s a great point. What is the smoke point of mineral oil? Chris

If you use the Linseed oil since it will with heat go "rancid" with use. The better solution is to use the new ALL Synthetic motor oil, much better since it was designed for use in "High"

Yes, buying a power non inductive resistor and an adequate heatsink is not expensive. I use and Anaren resistor similar to the ones suggested by Loris. It works great, but It happened I had 16 820ohm

IS not for you

Excuse me? MRM Sent: Sunday, November 1, 2020 11:57 AM To: [email protected] Subject: Re: [BITX20] Dummy Load Resistors - 1 pound sack e daie rompicoiota !!!! smetti di fare il bovaro quando parli di

e daie rompicoiota !!!! smetti di fare il bovaro quando parli di questi argomenti ! dai consigli corretti per far crescere le persone, non per farne dei cacciavitari ! se vuoi dei buffoni al posto di

Yes, the heat sink and the thermal coupling of the resistor to the heat sink are key to obtaining the power levels these packages suggest. They are rated in terms of allowable temperature rise, and if

Loris You are correct in these statements, that signal strength must be measured independent of the volume control, meaning we cannot sample it after the volume control setting. Second that rendering

Fortunately, I don't think two of the Tayda $0.06 3W 100 ohm metal film resistors (or similar) in parallel count as skimping when used with a uBitx.

Hi Bill it's true ! never skimp on such useful and simple tools! But ... if you want to build this accessory too, use suitable resistors built for RF, today you can find new ones for a few dollars !!!

hello Here, dunny load in a?converse box with linseed oil http://www.on6tn.be/Articles/Dummy_Load.pdf cdt

Hello, I will change my quartz filter on my home Ubitx. I will go from 12MHZ to 11.59 MHZ. I tested about 20 quartz. To compare and cross to my results, what are the 8 best for you? 8 numbers! The

Hi, Even though I have only 100 watt output class transmitters as my biggest guns here I have almost never run more than 75 watts. Several of my transmitters will not put out even close to 100 watts