In looking at the file that WD5JKO uploaded. I am not at all a techi sort of guy but I would like to add a bar display driver to the retro 75 as an rf level...
Dick, To answer the first part of your question, maybe look at the QRP SWR/Wattmeter here: http://www.norcalqrp.org/files/NorCal_Power_Meter_Rev_1D.pdf Here...
... I like the QRP idea too, but a QRO switch is nice to have in case you need it. :-) With summertime static, QRP 75M AM will be very limited until this fall....
... Yep Mac, The QRO switches here are on the 500 , the Globe Champ, the Viking 1 etc. Been using the little Retro more and more anyhow. I bought a two watter...
Thanks for your reply, as I said I am not a techi, the files you sent me will not open as jpeg for some reason unable to view them. Can you give me more info...
Jim this sounds like what I am looking for and simple. Would I pick up or "sniff" the RF from a direc connection on the back side of the antenna connector and...
OK, the Mini Mono Match was in the ARRL Mobile Manual, copyright 1968. Page 183 by James W. Rush Jr. W4EWL. A later version is in the ARRL QRP Classics ...
Yesterday, quite by accident I discovered something. I had a Johnson 275 matchbox in line with my Central Electronics 600L amplifier to see how varying the...
Hi Jim, I noticed the same effects as you did but never researched and experimented like you did. What I did notice when messing around with homebrew...
I put mine in a swiss-cheesed beater of an HW-30 Twoer chassis. ;) Anyway, I'm trying to use my restored D-104 with it using the recommended 100k resistor in...
... Jason, I'd say verify the modulator is functioning first before playing with a crystal mic. Do you have an audio generator? If so, hook it to the Retro as...
I also did not have good results with the D-104. I went with a cheap dynamic mic that seems to sound ok. I thought maybe I did not have enough modulation since...
Went out and bought the cheap dynamic Karaoke mike that was on the recommended list. Still same crummy modulation. (yes, I took the 100k out) I looked at the...
Ok, here's where I'll leave off testing for the night. I can make about .75 volts across the LED by really speaking loud into it. (this is with the Sony FV100...
Speaking of D-104's, go to QRZ.com type in W9AC. I have used Paul's D-104 mod and works very good. http://www.qrz.com/db/w9ac 73 de w5jay/jay.. Jason, I'd...
... Jason, Have you probed the RF output at the BNC with a scope? The "leaky dummy" load receiver approach always sounds terrible, and low level to me. Instead...
Do not expect your power meter to increase when you talk unless you are using a true peak Reading wattmeter. A normal wattmeter measures RMS average power and...
Jim, I recall looking at the RF out directly with the scope, and recall it overwhelming the scope... However that may have been when I was using the more...
Mike, In the name of full disclosure, its an old Tempo One SWR/wattmeter, so its probably the generic monimatch circuit. I just like it because it has...
Ok, the video of my Retro-75 on the scope is up at: http://www.youtube.com/watch?v=91efwgslReo I remembered there was something funny about my dummy load, went...
I watched your utube How much current is it drawing ? Hook up an ammeter in series with your power supply. The output looks normal into a 50 Ohm load, I find...
Bob, Thanks. I have all of the pieces to put together the W7ZOI power meter and 40dB tap, I just need the free time to do it! I will measure the current draw...
... The modulation looks real shallow. If the led is flickering at all, the AGC is kicking in too early. Try removing one end of D9 to disable the AGC. The AGC...
Jim, Removing that diode helped a lot. Sounds a lot better, scope pattern looks a lot better. In listening to recorded snippets with the SDR however, my FT-817...
... Jason, I am concerned that the 0.72A resting carrier current is too high. I see 0.4A into 50 ohms resistive load, and about 0.8A at somewhere above 50...
I've just posted photos of my recently completed Retro-75 "Delux". It includes the Retro Helper as well as the Frequency Mite. It is installed in a Ten Tec...
