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Good question. I have never used it on 144/440 bands. It works great as a QRP HF radio. 73, N7JFP

Great Question. I don't know. I am using flour two years old. No problems yet.

Check this video: th-cam.com/video/CWTg3qw7YRA/w-d-xo.html In video a drawing of connections. If you want CAT control signals going to the radio you do need an software driver interface for Data (Serial Port). For the audio portion you will need two audio ports (Mic/Speaker) defined on one USB port. Older radios used two ports. One for the CAT and one for Audio. Newer radios with built-in Sound Card only need one USB port. CAT/Audio go over the same USB port. Some USB port software is loaded in the radio and some need to be loaded on your Laptop. Good Luck, 73, N7JFP Larry

Yes. 50 to 200. Works great. Thanks for watching. N7JFP

I have no data/study that shows how long you can seal flour/cornmeal and it is still good. I would use it up in a year or two to be on the safe side. Main concern is protection from creepy crawly bugs. Thanks for watching. Larry

You can find the oxygen remover packets on Amazon for 10-15.00 per hundred. I don't use them. Thanks for watching. Larry

@@N7JFP thank you

Thanks for watching. It does get hot. I limit the time ON to 30 min to an hour per day. A bigger heat sink and/or fan would help. 73, N7JFP

Thanks for watching. To get rid of Dead air time and provide a background noise I use a soundtrack of a 1950's Teletype machine. 73, N7JFP

it's oddly relaxing lol

@@N7JFP Made me have nostalgia from working an AN/GRC-142 in the late 80s just as they were being replaced with digital mode terminals and packet switched networks. 73, KN4FVH th-cam.com/video/nVYF72Xn9qc/w-d-xo.htmlsi=LhEZiIXq0vwd7l8H

Thanks for watching. Great question. I do put the flour/cornmeal in the freezer for 3-4 days then remove it and let it come to room temperature for a day or two before I vacuum pack it. Suppose to kill any bugs or eggs. Larry

@@N7JFP Do you have a specific reason why you do it prior to vacuum seal it? Due to moister I would do it after vacuum sealing it - but it might not work in glas. In a plastic bag it works fine.

@@michlblacksmith I read somewhere it was best to use the freeze method to kill possible bug/eggs infestations in grains before storing them. I do let them sit for days to let any moisture evaporate. I try to cycle thru the ground grains within a year. I have no long term storage data. Larry

JTDX shows FT4 on 6m at 50.318. FT8 shows 50.313. Maybe that is why no one was on the air. Will have to check into the frequencies more. 73, N7JFP

I have not tried using it on a receive only antenna. It's main purpose is for the transmitter/antenna matching. 73, N7JFP

The overall length of the antenna is 1/2 wavelength. The connections should be as close as possible as construction allows. Both sides being the same length is what is important. Good luck, 73 N7JFP

Soaking the lid helps to clear the oder. Some items it does not matter, such as sugar, salt or baking soda. Thanks for watching....

The wire chart website has gone down. The size of the toroid will limit the gauge of wire to wind. 18 or 16 work fine. Try one and see the results. 73, N7JFP

Depends on direction. Radio is 50-antenna is 200. 73, N7JFP

By heat treat I mean in a oven at a low temperature for so many minutes the let cool completely before bagging and sealing.

Well I just vacuum mine in a paper bad inside my seal bags .

@@paulatudor691 you know to watch for bloating of the bag right, it's not a good sign. One of my friends thought if you vaccuum seal something it was good for ever, which is not the case.

@@lindaschmidt981 no never has it . Usually gases cause that . Mine are hard as a 18 year old. So I never had a bag puff back out . Knock on wood.

@@lindaschmidt981might wanna open it the heat treat method tends to introduce moisture to the product

Yes they are very quick and works perfectly every time!!

Thanks for being interested in vacuum sealing. Do an Amazon search for "3 gallon vacuum chamber stainless steel". There are a lot of sizes to choose from. Also on eBay. Also watch sealing walnuts and oatmeal. th-cam.com/video/QC05deRz3iE/w-d-xo.html ... Hope this helps. Larry

I leave the mic unplugged. You could turn down the mic volume. WSJT is controlling the output. Make sure the Audio setting are for the SignaLink Codec. 73, N7JFP

I did a repurpose on it. Found it on ebay. There are a lot of sizes -----> --www.ebay.com/itm/3-Gallon-250mm-9-8-Stainless-Steel-Vacuum-Degassing-Chamber-PC-Lid-from-USA/174799472337?&shqty=1&isGTR=1#shId-- <---- It works great. Larry

That web site doesn't exist anymore.@@N7JFP

I decided not to use oxygen absorbers and just check the seal every so often. -25 inHg makes a very tight seal. One year is a long term storage for me. Thanks for watching. Larry

what size do you use for 40m please john?

I assume you mean the video. Video camera and edited video with Camtasia for windows. Thanks for watching.

WSJT-X digital modes with Ham Radio Deluxe for mainly control and logging. I use GridTracker and JTAlert for the audio and visual effects. Thanks for watching. 73, N7JFP

I have not tried it for the TV. Try it and see if it works. 73, N7JFP

1/2 inch tubes from an old TV antenna. 73, N7JFP