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Retro 75- Anybody built one?
- Thread starter RickC.
- Start date
Hi Rick,
I haven't built the kit, yet. However, I've got one ordered, and will let you know what I think when it gets in and I put it together. It doesn't look to be that difficult to build, so I should be able to comment further in a couple of days.
73
AC5CH
I haven't built the kit, yet. However, I've got one ordered, and will let you know what I think when it gets in and I put it together. It doesn't look to be that difficult to build, so I should be able to comment further in a couple of days.
73
AC5CH
That looks interesting. That would make a nice little project,throw in a pair of 807's or similar after it and it would make a nice little 50 watt rig.
Well I was just over on amfone.net where all the serious AM'ers hang out and it is getting some good comments. Even the guys that run Big Iron or Heavy Metal as they call it are saying good things about it.
My 75'r has arrived today first look.
retro 75 board is complete
My 75'r has arrived today first look.
retro 75 board is complete
Hey thanks for the links and let me know when that Mississippi 75r is on the air, I'll listen for it.
...driving a pair of 807s, would that not be cool?
Hmmmm.... wonder how stable and linear a little KL 203 would be at 3885? I assume they use a broadband transformer and not a tuned circuit on the output, maybe someone could confirm/deny that.
Anyway, I've had my hands full with work this year and for some reason just became aware of this little rig a couple of days ago. I have not visited amphone since I was working on my old Ranger a couple of years ago, but I'll scan through the posts there.
There's a very active AM group here in the SE US, though I have not checked in on the Tuesday evening net in a couple of years. My little IC-718 has gotten surprisingly good reports from the SE AM club bunch, and I'm told the ICM/compression at 25W carrier sounds very good, and I will sometimes feed that into my old SB 200 for 125W carrier. The Valiant/HT37/HT44/Collins crew seem to like it.
This is an intriguing idea. I hate it when I run into those.
Rick
...driving a pair of 807s, would that not be cool?
Hmmmm.... wonder how stable and linear a little KL 203 would be at 3885? I assume they use a broadband transformer and not a tuned circuit on the output, maybe someone could confirm/deny that.
Anyway, I've had my hands full with work this year and for some reason just became aware of this little rig a couple of days ago. I have not visited amphone since I was working on my old Ranger a couple of years ago, but I'll scan through the posts there.
There's a very active AM group here in the SE US, though I have not checked in on the Tuesday evening net in a couple of years. My little IC-718 has gotten surprisingly good reports from the SE AM club bunch, and I'm told the ICM/compression at 25W carrier sounds very good, and I will sometimes feed that into my old SB 200 for 125W carrier. The Valiant/HT37/HT44/Collins crew seem to like it.
This is an intriguing idea. I hate it when I run into those.
Rick
Yeah I agree. I have a whole list of intriguing ideas I want to follow up on. Actually it's more like a scroll rather than a list. It goes down to the floor, across the room and out the door. :laugh:
LMAO!! Like rolling out the red carpet
Along with the red ink to follow up on all those ideas as well.
Well after looking at that little rig some more I have decided to go to the post office Tuesday morning, it's closed until then with Monday being a holiday up here, and get a money order off to Small Wonder Labs for one of those. I probably won't do anything with it until the fall and it would make a nice little project for then. I also have a pair of NOS National 811A's that I forgot all about that would make a nice pair of finals for it. I see it comes with XTALS for 3880 and 3885 but I would want one for 3735 as well as we use that one up here on Sunday mornings.
Always glad to be a bad influence!
There's a link on the site to a guy who has other xtals. That little rig is on my list also for this year but it'll have to be later-- I have way too much going on right now, unfortunately.
I would wait until he had the cabinet for it anyway (next month) as I don't have any cool old radios like a Two'er to house it in.
Good deal! Let me know how it goes.
Rick
There's a link on the site to a guy who has other xtals. That little rig is on my list also for this year but it'll have to be later-- I have way too much going on right now, unfortunately.
I would wait until he had the cabinet for it anyway (next month) as I don't have any cool old radios like a Two'er to house it in.
Good deal! Let me know how it goes.
Rick
Seems this design could be made to serve 10 or 11 meters AM.
Tank circuits and low-pass filter could be retuned.
The SA602 mixer has no problem to run on higher frequencies.
But the variable L.O. would need to be changed to a DDS, along with the crystals replaced to be fed by the same. Two channels is probably ok for 75M, but not on other bands. Perhaps a dds with lcd could increase cost by $30.
I am unsure about D1,D2,D3,D4 used to keep TX power out of mixer. Should be fine at such low power, but anything higher would need a real switch.
Tank circuits and low-pass filter could be retuned.
The SA602 mixer has no problem to run on higher frequencies.
But the variable L.O. would need to be changed to a DDS, along with the crystals replaced to be fed by the same. Two channels is probably ok for 75M, but not on other bands. Perhaps a dds with lcd could increase cost by $30.
I am unsure about D1,D2,D3,D4 used to keep TX power out of mixer. Should be fine at such low power, but anything higher would need a real switch.
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