Warning: Creating default object from empty value in /homepages/11/d132647312/htdocs/Amfone/mkportal/include/SMF/smf_out.php on line 47
Recent Posts




 
The AM Forum
November 27, 2022, 01:51:37 PM *
Welcome, Guest. Please login or register.

Login with username, password and session length
 
   Home   Help Calendar Links Staff List Gallery Login Register  
Pages: [1] 2 ... 10
 1 
 on: Today at 06:48:50 AM 
Started by W1ITT - Last post by WB4AM
Finally, my 14-bit Hermes arrived here in Maine.  It started out via DHL from Gurugram, a ways down the road from New Delhi, hence to Bahrain, and on to Leipzig, and to Cincinnati and then to Boston.  DHL got tired of it in Boston and gave it over to the USPS which brought it to me today, Friday.  For those who have ordered, be advised that there are no connectors that you can wire up to bring in power etc.  It'll take some chasing around in the Mouser catalog to get them.  But Mouser is pretty darn quick so I'm not worried.
73 de Norm W1ITT

That's great Norm, well actually that's awesome!  When I first read your post my thoughts were Wow!...I still can't believe the wait was this long.

Thanks for giving us heads up on the voltage input connections.  Will you be using the Power Poles?  On my Anan 100 I had issues with the connections
that Apaches Labs originally used.  I didn't go with the Power Poles, I just wired it directly.  I suppose having the options of disconnecting at the radio is more convenience,
but its never been an issue so far.

By the way, although I ordered the 10 watt board from Apache Labs, I decided to order that other 10 watt board that you had posted about.  A friend of mine had bought a used a 10E and it seem to have issues with
the on-board 10 watt unit.  So I decide to make the purchase on my behalf to see how this amp that you had mention will work.  <<< (Just for Shins and Grins, learning purpose and for future references)

Well again I am glad you finally received your Anan.  Maybe you can report back with your ideas on your build and any experiences you may or may not encounter, and any pics as well!

73 for now...Ken




 2 
 on: Today at 06:18:58 AM 
Started by W1ITT - Last post by WB4AM
Hello Francis (WA1GFZ)

Don't know if you are aware that you have me blocked on replying
to your message.
I have been trying to reply to your message that you had
Sent, but you have me blocked.

Ken

You aren't the only one.  I've had that issue for a couple years with replying to him.

He is active on facebutt, if you have it.

--Shane
WP2ASS / ex KD6VXI

Hello Shane,

Francis had gotten back to me, he said he doesn't know why he is blocked or why we are blocked trying to get back to him.


 3 
 on: Yesterday at 02:20:43 PM 
Started by W5FH - Last post by K9MB
Yes, impedance ratio is the square of the turns (voltage) ratio.

If you have a good inductance meter, measure the inductance of the high impedance winding. The higher the inductance, the better the low end response. Ideally, it should be 8H or more, though, for example, an A3894 100watt Stancor is only about 4H maximum.

If you taylor audio response to cutoff at the low end a bit higher, you can get more power out of it, but give up 50Hz range.
Most of these small trannys are not high fidelity.
73, Mike

 4 
 on: Yesterday at 11:12:13 AM 
Started by W5FH - Last post by WBear2GCR
pictures?

You can determine the turns ratio by applying say 10volts AC and measuring the voltages on all the taps.
Apply the formula to convert turns ratio to impedance ratio and get a very good idea what it is/does.

                        _-_-

 5 
 on: Yesterday at 03:35:34 AM 
Started by W1RKW - Last post by AJ1G
I havenít done business with them at the ham radio level, but JAN Electronics in New London apparently does over the counter sales to the public.  Joe, N1VIV went over there for some small components needed when we were getting a DX-100 working for Bob, W1GTH earlier this year. 

 6 
 on: November 25, 2022, 06:11:58 PM 
Started by W5FH - Last post by W5FH
Hello-
    Does anyone here have any technical info regarding the ROLA manufactured audio interstage transformer RC1205 and modulation transformer RC1206 as used in the BC-1158 WW2 VHF transmitter? I am considering using these and am very curious if anyone had any ROLA technical data? I know the RC1205 I/S is for matching the P-P plates of a 12SN7 to the P-P grids of an 815 modulator tube. I am very curious about the quality of this transformer in regards to audio bandwidth/frequency response and distortion; not many center tapped on both sides types show up. It appears pretty substantial in construction/weight.
     Also would like info on the RC1206 modulation transformer although it is known that it matches the P-P plates of an 815 on its primary and the B+ supply to an 815 RF power amp on its secondary.
Thanks,
Byron W5FH

 7 
 on: November 25, 2022, 03:59:37 PM 
Started by W5FH - Last post by W5FH
Hello-
    I have in my stock a modulation transformer in a sealed housing with a schematic drawing on the side of housing showing the primary and secondary taps. However, they are not identified as to turns ratio or impedance. It is marked "25M90" and "55w". Does anyone here have any data on this unit? It appears as a "poly-pedance" type with many taps.
Thanks,
Byron W5FH

 8 
 on: November 25, 2022, 12:28:38 PM 
Started by W1ITT - Last post by W1ITT
Finally, my 14-bit Hermes arrived here in Maine.  It started out via DHL from Gurugram, a ways down the road from New Delhi, hence to Bahrain, and on to Leipzig, and to Cincinnati and then to Boston.  DHL got tired of it in Boston and gave it over to the USPS which brought it to me today, Friday.  For those who have ordered, be advised that there are no connectors that you can wire up to bring in power etc.  It'll take some chasing around in the Mouser catalog to get them.  But Mouser is pretty darn quick so I'm not worried.
73 de Norm W1ITT

 9 
 on: November 25, 2022, 09:42:10 AM 
Started by W1RKW - Last post by KD1SH
Very sad; love that place. CT's a small state, but it was still an awkward drive for me so I didn't get there too often, and bought more from their website than their brick & mortar. Every time I was in the store business was booming. I regret their closing, but I salute them for a long, successful run in a difficult market and in small-business unfriendly state.

Cables and Connectors in Newington CT to close.  Owner is retiring.

 10 
 on: November 25, 2022, 08:48:27 AM 
Started by xe1yzy - Last post by xe1yzy
Project update,

     I receive an email from Jim WD5JKO, he suggest  me take a look on a couple of 10 ohms cluster resistors on the filament of V1 6BL8 ( Mic amp. and VOX), I found 3 10 Ohms resistors in parallel on each side of the filament, I mesure the resistance and I have 2.5 ohms on each cluster, or 5 ohms in total, according to Ohms low, that suppose a drop in voltage to 4.05 volts, instead of 6.3V.

      Well, I by pass those branches , and the transmitter como back to life, the VOX works OK, and Audio also are Ok, the only difference I noticed, is a more blinks on the limiter lamp, So Jim and I wondering why CE put those resistor to lower the filament voltage ?, maybe a fancy way to reduce the amplification gain of the tube?

Regards
   

Pages: [1] 2 ... 10
AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
 AMfone © 2001-2015
Powered by SMF 1.1.21 | SMF © 2015, Simple Machines
Page created in 0.035 seconds with 14 queries.