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Here is a part number for 680 nh smd inductor from Arrow electronics. Data sheet available on product page. Looks like the size is a 1212. I have not tried it yet, but specs look about right

Raj, Rather than just using double shielded coax from the 2 pin RF plug on the uBITX to the BNC, I carefully installed gold plated female SMA connector and that should help some but I'm just using the

So what?exactly are these seniors complaining about? They heard you had a uBitx, and think you should not be using it at all? They somehow checked your harmonics and out-of-band spurs that are 30dB

Much slower this morning but made three more before breakfast. I'm just running of of 8 AA batteries so I think that folks with good antennas heard me and folks without or pointing the other way

Power does not decrease when on 12V for the PA only on 24V. Using a 3 amp supply for the 12V both main board and the PA (when it is on 12V). When I switch the PA to 24V, I use a set of LIPO batteries

Nice! I made a contact to a PA QSO party with my bitx40 too. NY3B 7.191. Tried some others but got frustrated and turned on my Kenwood 430.?? 73 Dave k0mbt

After a lot of investigations (HI !) I found that there is a contact beetween pins 3 and 5? (K3) but there is not any continuity beetween pin 3 and M1 and beetween pin 5 and M2. But continuity is 0K

Jim I agree with you regarding the lowest number of turns. My theory is that the relay contacts are acting as the primary of a current transformer inducing the RF current flowing in the contacts into

Tom - great link, thank you. Do you recommend I wait a while, or is this part good to go? Senior folks in my club bash me 'bout my spurious emissions. They have strongly encouraged me to "work on that

GM Jim, 400mW is 33mA that should be OK for the transistors. I will try lower current one when I find a cheaper source or a vendor who will send me by USPS.

The parts in the photo appear to be these parts: https://www.budgetronics.eu/index.php?action=article&aid=13200&lang=EN Not sure they are Murata parts. I would concur that a part marked ‘681k’ is

That is 680nH or 68 followed by one 0 - uH would have been 684 marking IMHO - like resistors. I measured them and they were exact 680nH. In some places the discussion relating to 680uH is about

Raj, I thought the same thing, but maybe, even using sockets, just for the experiment, I could get some relative comparisons between the types to see if any were better than others. I suspect the

Am 14.10.2018 um 03:34 schrieb Joe Puma: In some postings are mentioned 680uH inductors in some 680nH. uH or nH?? I had a look at the picture in Raj's posting #60465 and read there 681K. This would

The learning module referenced is an excellent source for ALL electronics theory. Add it to your home page. This winter when it is too nasty to go outside and you are tired of making contacts you can

In ricezione: su 40mt con impostazione di default Lsb non si riesce a rendere intelligibile la conversazione, impostando Usb tutto bene. Sui 20 mt il contrario. In reception: on 40mt with default

Lev, Any experiments on this ?

Tim, Looks like you 12V is not OK. Increase to 15V and see. I have run my boards on 15V with much better output. If the power goes up and then settles back down, I suspect your 12V not sustaining

I've only recently got my bitx40 working after replacing a bad Arduino board and an end fed antenna with a good Nano and a sloping dipole.Plenty of ears but zero contacts until this weekend. I'm in

Jim, My take on this relay business is that both contacts are being inductively coupled. Imagine the NC contacts on one side - it is a loop and will be inductive. The same goes for the other pair on