|[AMRadio] BC-610 terminating impedance|
rbethman at comcast.net
rbethman at comcast.net
Sun Oct 30 14:09:32 EST 2005
Download a copy of the manual, TM 11-286.
This can be gotten from:
This is WB2FCNs web site.
The area you want to look at in the TM starts around page 43.
In the Military versions of the HT-4, (BC-610s), there are what looks like HV fuse clips on the top of the final loading cap. Depending which loading coil is used, either C-455 or C-454, dictates whether you use a 55uuf or a 100 uuf vacuum capacitor.
If I had spares, I'd hook up with you and we'd talk. Unfortunately I do NOT.
There are OTHER changes that MUST be made to the TX - OR - damage can occur. These are some MINOR rewiring that are COMPLETELY reversible!
If you own and use a BC-939 tuner, it ALSO must have some rewiring done, and use of another one or two vacuum caps are used. With the BC-939, the "long wire" specified for operations from 1Mc to 2 Mc is 125 ft.
As to the HT-5 speech amplifier, I strongly suspect that a BC-614 speech amp CAN be used in lieu of the HT-5. Watch that "E" place for them to turn up. They do from time to time.
The other place to go would be the T-368 BC-610 mail list through QTH.NET. Join the list and meet some other owners of the BEASTS!
Bob - N0DGN
> With all this interesting discussion about the BC-610 I'm reminded of a
> question I asked a while ago regarding the padder-cap for 160 operation.
> I do not have a BC-610, nor, other than photos, have I ever seen one. I do
> have the Hallicrafters HT4-B, which was made in 1938, and was the basis for
> the BC-610.
> In the HT4-B, there is a platform in the rear left corner of the RF
> compartment with four banana jacks. These jacks are hard-wired in such a
> fashion that if a capacitor were plugged into two of the jacks it would be
> in parallel with the variable tune cap.
> I was told, years ago on the air, that this assembly was to be used for a
> plugin fixed air capacitor for low frequency operation.
> I use a 50pf vacuum cap for 160 operation, but I'd certainly like to know
> more about the plugin air cap. And, if any still exist, because I'd
> certainly be in the market for one.
> Also, I'm still looking for the HT5 speech amp.
> Barrie, W7ALW
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