开云体育

ctrl + shift + ? for shortcuts
© 2025 开云体育
  1. BITX20
  2. Messages
Single Messages Topics Expanded Polls

Re: FS Sbitx V2. (No Pi)

 

AH, thanks!!!? ?I didn't kknow that rig cat was implemented.

Watching my output on a 100MHz scope, with my voice and the latest microphone?(I lost the one that came with the rig, my bad) --- I'm only getting at most 1/2 the CW voltage out, which means 1/4 the power (-6dB).? ?If I push the software gain any higher than about 25....there is clear distortion which is obvious on a monitoring radio and also to a friend a little ways away....

I'm using one of the mic elements that went with a ubitx series radio.? ?But the output just isn't quite enough.? ?At least now with me being VERY LOUD into the mic....

I may build a little preamp with a gain of 10 or so to allow me to back down on the software?gain, or get one of the higher output cartridges (-24dBm).? ?I suspect the one I'm using is more like -35 dB which is typical of a lot of them.? ?

I was able to do a comparison this morning between my homemade mic (ubitx cartridge) versus an eBay "Icom" mic -- which works FINE on my 7300.? Switching to the ubitx cartridge, it was modulating basically the same.? ?No discernible difference.? ?Then I switched to a gamer headset with some sort of electret inside and it might have been a tiny bit more output if I put the mic very close (like 1-2 cm) from mouth.? ?But definitely not 10dB stronger.

My experience with Signalinks has always been that the ubitx/sbitx series need a LOT more audio than other rigs in our group's experience.? ?Not a problem.? ?This reduces the risk of rf interference!? ?

I'm just pleased as punch that I was able to mechanically fit the little mic?cartridge into a classic desk microphone == the ones I have don't have the transistor amp, however.

OldFashionedMic.jpg

Crammed plastic-y wrapping material behind the cartridge and put a bit of T-shirt in front of it and it worked in this mic shell.? ?I can pick these up all the time at hamfests for $15.? ? I just can't bear the thought of paying $170 for a desktop mic!!!


THANKS for the tip on the riccat.? ?I may need to upgrade software....
Gordon KX4Z


On Mon, Sep 18, 2023 at 7:24?AM Rafael Diniz <rafael@...> wrote:
Hi Gordon,

Mic pre-amp? I understand if the mic is of better quality, but
amplification is something definitely not needed, as the level is
totally software controlled.

rigctl "network" CAT is already implemented in Ashhar implementation.

- Rafael

On 9/18/23 09:00, Gordon Gibby wrote:
> We were finally able to make email contact and I was able to purchase
> the V2.
> Pishop has raspberry pi 4's in stock at the moment, and although I had
> a spare one, I picked up an additional one.? ? With MY history, one
> can never have too many.
> Will be interesting to see how the V2 does.? ? Next move is either to
> ger some of the PUI high-output mics? (rating -24 dB)? or build a
> small mic preamp.? ?Also plan to test the mic cartridge that came with
> some uBitx kit, on an icom 7300 and compare to their handheld for
> sensitivity to sound pressure.
>
> I'm hoping that I can find a way to put the zeners on the gates of the
> finals, and change out the insulators to the Aluminum nitrides I still
> have around here somewhere.
> Very interesting rig, and the V2 with its diode switching of relays,
> should be able to do ALE (automatic link establishment)
> Really need an ICOM CAT emulation!!
>
> Gordon KX4Z
>





Join [email protected] to automatically receive all group messages.