If anyone has any experience, could you please tell me how
this adjustment is performed.
From my reading by default it's prevented so high voltage and damage won't happen.

It's suppose to allow slightly more or less capacitance and inductance
than what's available by default.

I run low power and wanted to find out if either more or less cap/Ind would
help with some tuning.
I have read the manual a few times and I am still a bit confused
how you extend the range.

thanks
Ken
N1KK

OK? This the loss between the ports..? so power on? (? Not in TX )?

From ANT connection to the SDR? it has 2 db of loss? should have? 0 DB? or no loss ( shorted )

From ANT connection to the radio? its shows -50 db of loss? or you could say open? no connection..

So when the sdr is receiving the radio is not receiving at all .. ?

when in TX? it seems to work right?
Ant to XCVR ( radio) =? 0DBM? or shorted?
Ant to SDR=?? > -60 Dbm across? band? 2-30 mhz? or open

my question is? why 2 db of loss should be shorted .. or no LOSS

Skip

On Sat, Dec 17, 2022 at 02:16 PM, Skip wrote:

Powered on??
ANT to XCVR=? -50DBM to -35 DBM? ( 2 Mhz,30Mhz)
ANT to SDR= -2dbm across frequencies 2-30 Mhz

Please forgive my ignorance, can you explain what this is?

ANY ONE????

Skip

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MFJ 901 B
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Ken, W8EK

Ken Simpson
E-mail to W8EK@... or W8EK@...
Voice Phone (352) 732-8400





.

All, This does not seem right..

Powered on??
ANT to XCVR=? -50DBM to -35 DBM? ( 2 Mhz,30Mhz)
ANT to SDR= -2dbm across frequencies 2-30 Mhz??

Power on in TX

Ant to XCVR=? 0DBM
Ant to SDR=?? > -60 Dbm across? band? 2-30 mhz

Question is WHY is there a 2 DB Loss from ant to SDR in RX ?? ? and why is there a -50 db loss to XCVR port..?? Seems that it should also be 0 dbm for both..

HELP?
Skip

PS? MFJ doesn't respond to my emails..

I ordered the 4602 entry panel from them, but I ordered it with N connectors instead of PL style, and there was no extra charge. PL-259 fittings are junk in my opinion, and are best used for audio applications, cause that's about the limit of their frequency response!

开云体育

I changed some. No problem loosen the nut and out it comes you don't need to mess with the panel. The problem is that a standard N barrel isn't long enough to seat a male on both sides you need a longer barrel.
I used a "MPD Digital 3-Inch Extra Long N Type Female Threaded Bulkhead Barrel Adapter" from Amazon?? ? ??

开云体育

Heard of a mod to short together the Ant and Xcvr ports together? so transceiver can also RX while in RX mode...? any one know of this?

Skip? WB4YO

There is a scammer site that's been reported to the FTC. From MFJ's site:

"There is a SCAM website currently advertising as MFJ. Please be aware that this
site is not MFJ Enterprises, Inc. We have reported this to the Federal Trade
Commission. Do not purchase anything from scammer website."

This is the REAL site:



Also note that if you allow them to have your email address, you can get a free
copy of a book, 73 DIPOLE AND LONG-WIRE ANTENNAS. There is a link on the above
page to do that.

HOWEVER, their link to subscribe and get that is broken. I suggest contacting
them and arranging to get the book for free. It's not a book you'd sell your
soul for, but it's free, and it may give some members ideas on simple wire
antennas. The book is for sale for $24.95, a bit overpriced in my opinion, but
they appear to have bought the rights to it and it's out of print except there.

To do this ethically, you should sign up for their email list, but I don't see
how to do that with their broken site. Then you are taken to the URL below,
where you click on the words: "Click Here" and that gets you the publication at
the URL below.

So you can get it there if you wish; it takes you to a Google Drive document in
PDF. It's an OLD book, first published in 1969, and I think it was then
distributed by 73 Magazine, a Wayne Greene publication.





Donald KX8K



----------------------------------------------------
Some ham radio groups you may be interested in:
/g/ICOM /g/Ham-Antennas
/g/HamRadioHelp /g/Baofeng
/g/CHIRP

James . . .

On Sun, 30 Oct 2022 14:10:17 -0700, "James M. Horak" <kg5pte@...> wrote:

But then again if the antenna is already resonate for that frequency then I may not see anything happen I do not know.

What is displayed for the SWR, forward, and reflected power on the tuner? What
does the power output of the radio and on the display show (you would have to
press the LCD Mode switch to get the other parameters to display)?

If SWR is close to 1:1, then there would be no need to tune. This would
especially be the case if you were using that band previously. If you're putting
out close to 100W, and SWR is low, then there's no need for the unit to go into
the tune mode.

Donald KX8K





----------------------------------------------------
Some ham radio groups you may be interested in:
/g/ICOM /g/Ham-Antennas
/g/HamRadioHelp /g/Baofeng
/g/CHIRP

Hi I am using an Icom 7300 with my MFJ 993B Intellituner with the MFJ interface cable. I notice today that the tuner would not tune up 10MHZ. I normally tune at 20 watts power. But then again if the antenna is already resonate for that frequency then I may not see anything happen I do not know. I normally tune anything from a 3.5 swr to 1.1 swr.?

Thanks

I recently made some repair work on my MFJ-993BRT tuner.
Unfortunately I forgotten to check the followig:
1. Can the switch board (atop the main pcb) be easily removed?
2. IMO the tuner should work normally with the switch board removed.
3. Is the microcontroller U1 (PIC16F76-I/SP) read protected?
Thanks for any reply,
Robert W4BCZ

Thanks Jeff
eBay is high risk to get fake…
Unfortunately Mouser has out of stock. ?

So RF Microwave only to get them…

73 - Petr. OK1RP

Mouser


RF Microwave


everything RF


eBay, Chinese, but what isn't these days?

Hi all

any hint where to buy genuine?schottky diodes surface mount 2820s for MFJ please??

Petr, OK1RP

There is a nice rectifier on the external power input that should/might protect the rest of the meter.
Bob N5TX

This might help:

Bob N5TX