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Arvid I wound a 37-6 with fifty turns as per the calculator, worse. I shorted the crystal and found I had moved lower to 6190. from the 8200. But still had the 135 KC tunable range with the crystal

Jerry K5LRU That indicates that your BFO oscillator should be tunable. Next step would be to check capacitor and inductor values to make it tune across the crystal frequency. You can change the

The crystal brand is KDS. I took your advice Arv and shorted the crystal out and the frequency tuned from 8104. MHz to 8239. Mhz 105 KC range. But way lower than the 9995. Mhz area. Jerry K5LRU

Jerry K5LRU The LC network in series with the crystal (including series-C of the two feedback divider caps) needs to tune to the crystal frequency. Tuning this resonant network a bit above to a bit

What type and brand of xtals are you using? Paul k5wms Quoting jerryk5lru : This is a Bitx20 Version 3. I'm almost done with it. The receiver receives good, the VFO bandwidth is between

This is a Bitx20 Version 3. I'm almost done with it. The receiver receives good, the VFO bandwidth is between 14,000. and 14,450. The exciter produces a signal of 500mv and the PA kicks that up to

Works for me! _._

Why can't you take the 12.6 volts supply for the 20a and at about 10 watts out the current draw is about 2 amps. Subtract about 300mas no mod current and you get 12.6 x 1.7 = 21.42 watts. If you

Arnab - VU2BPW This sometimes confuses me as well. It seems that the key is in impedance relative to voltage and current. If we lower the impedance the current will increase and voltage will

hi arv, ??? i am still a little bit confused. with 12volt and a single irf510 based design, how much rf power can we get??? 12volt rf? across 50 ohm load, so my calculation

Rob I think that it may take more than just increasing voltage to the output MOSFET. If you change the voltage the current will change and impedances involved will change. That would seem to

Bitx is built and seems to be working o.k. on 20M,running on external 13v supply. If i increased the voltage on the pa transistor only to say 25v would we see much of an increase in power? This

That should work just fine. Have a great day, --... ...-- Dale - WC7S in Wy To: BITX20@... From: kg6wni@... Date: Tue, 18 Jun 2013 22:09:19 +0000 Subject: [BITX20] inductor

I'm putting together the frequency counter/digital dial for my Bitx20a V1.3. In the BOM L1 is 4k7 uhy, the one that came with my kit has 2R7 on it. Is this OK our should I get the right one.

Thanks for reply. I think I will not fit extra resistor then and I'll just drop levels using the pot that is part of oscillator kit. I don't have the resistor fitted in bitx20a, I was trying using a

Dave MW0PRI 45 to 50 mv is the best level. If using a signal generator input you will need to disconnect R-92 so that it is not trying to pull your signal generator output to +12 volts. I don't

Dear All, I am still messing with final alignment of my bitx20a. Having read advice, and given I quite like building things, I have just built a simple "tone tone oscillator" kit to help set up the

The schematic for the board is in the files section under "Modifications". Also a nice AGC circuit (which is incorporated into the smd BITX v.4). john AD5YE

Howard I usually do my reports like you. HI Hi Ron

I think you're right. It probably is an S meter board. I've never looked at the S meter on a rig. when I give a report it's always as I hear it. I find the S meter varies with AGC gain etc. Nothing