AN/VRC-7
- willy
- G-Lieutenant General
- Posts: 3502
- Joined: Thu Aug 21, 2003 8:42 pm
- Location: Oakland,Ca.
RT 70
The RT70 and AM-65 are a stand alone radio set VRC-7
The am-65 is also used as amp for intercome in some conficarations
AN/GRC 3 t0 8
No need for more the power supply is inside the AM-65 or should be
6, 12, or 24 volts.
Willy
The am-65 is also used as amp for intercome in some conficarations
AN/GRC 3 t0 8
No need for more the power supply is inside the AM-65 or should be
6, 12, or 24 volts.
Willy
I have Military and Radio Surplus.
MVPA Life Member 683
1943 GPW 98356, 1964 M151, and trailers, plus many Radio's 916-761-5293
Seabee Navy 1982-1988
NRA life Member, KE6EMX
Sold M35A2, M38, M38A1, M880 M37B1 all restored by me
MVPA Life Member 683
1943 GPW 98356, 1964 M151, and trailers, plus many Radio's 916-761-5293
Seabee Navy 1982-1988
NRA life Member, KE6EMX
Sold M35A2, M38, M38A1, M880 M37B1 all restored by me
- wa5cab
- CWO4 (Ordnance) USNR
- Posts: 2064
- Joined: Sun Dec 29, 2002 11:22 am
- Location: USA/TX/Houston
- Contact:
Richard,
To add to what Willy said, inside the AM-65 should be a small plug-in vibrator power supply. There were three types, PP-282/GRC (24 volt), PP-281/GRC (12 volt) and PP-448/GRC (6 volt). The PP-281 and PP-282 were also used in the R-108, R-109 and R-110/GRC receivers. For an AN/VRC-7, you also need one MT-300/GR Mount plus antenna and audio components depending upon vehicle.
AM-65 by itself was used as part of Interphone System AN/UIC-1. RT-70 by itself was part of AN/PRC-16, with Generator G-8/GRC and Battery Box CY-590/GRC.
In the AN/VRC-7 and the AN/GRC-3, 5 and 7 (and a few other sets), the AM-65 is attached to the mount and cables from the mount plug into it. The RT-70 attaches to the top of the AM-65 and they are connected by the small dog-bone cable CX-1213/U.
To add to what Willy said, inside the AM-65 should be a small plug-in vibrator power supply. There were three types, PP-282/GRC (24 volt), PP-281/GRC (12 volt) and PP-448/GRC (6 volt). The PP-281 and PP-282 were also used in the R-108, R-109 and R-110/GRC receivers. For an AN/VRC-7, you also need one MT-300/GR Mount plus antenna and audio components depending upon vehicle.
AM-65 by itself was used as part of Interphone System AN/UIC-1. RT-70 by itself was part of AN/PRC-16, with Generator G-8/GRC and Battery Box CY-590/GRC.
In the AN/VRC-7 and the AN/GRC-3, 5 and 7 (and a few other sets), the AM-65 is attached to the mount and cables from the mount plug into it. The RT-70 attaches to the top of the AM-65 and they are connected by the small dog-bone cable CX-1213/U.
Gunner
USN Retired
MVPA 9480
USN Retired
MVPA 9480
-
- G-Private First Class
- Posts: 12
- Joined: Fri Aug 15, 2008 5:51 pm
- Location: Buenos Aires, Argentina
- Gerry42
- ARMY-Master Sgt.
- Posts: 155
- Joined: Sun Oct 14, 2007 7:22 am
- Location: SC, USA
Korea family radios
the TM 11-184 is on the VRC3 thru 8 but it covers all the radios in that family really well it tell what all the parts do and how they are hooked together
mule mutt M100 45 MB MBT M601WC22 Ben Hur
MVPA 31190
MVPA 31190
- wa5cab
- CWO4 (Ordnance) USNR
- Posts: 2064
- Joined: Sun Dec 29, 2002 11:22 am
- Location: USA/TX/Houston
- Contact:
I believe that is TM 11-284 on AN/GRC-3...8.
Ref TM 11-285 on AN/VRC-7, the 4-pin DC power input connector on the AM-65 is J-6. Pins A & B are +, Pins C & D are -. Check which power supply is plugged into the AM-65 before you apply LV DC to J-6. Odds are about 10:1 that it's a PP-282 but it might not be. And if it isn't and you power the set up with 24 VDC, you won't love the results.
Second, odds are worse than 3:1 that the vibrator in whichever supply you have won't start. If this proves to be the case, don't throw the vibrator away. And don't go looking for an NOS replacement on eBay as it will have the same problem for the same reason (see earlier posts having to do with vibrators in PE-237's or PE-97's, 117's and 120's). I offer a cheap service to fix most vintage vibrators. $5.00 plus shipping if the easy fix works. $10.00 if I have to do surgery and open it up to physically burnish the contacts. Or if you qualify as an ET or an EE over 55 I can tell you how to do it.
Third, as with the recent discussion about operating an RT-66/7/8 off of the mount, you will need to jumper pins J and H in Connector J-4 (the one marked REC-TR CONT). Else there will be no B+ to the 2nd Audio tube in the RT-70.
Ref TM 11-285 on AN/VRC-7, the 4-pin DC power input connector on the AM-65 is J-6. Pins A & B are +, Pins C & D are -. Check which power supply is plugged into the AM-65 before you apply LV DC to J-6. Odds are about 10:1 that it's a PP-282 but it might not be. And if it isn't and you power the set up with 24 VDC, you won't love the results.
Second, odds are worse than 3:1 that the vibrator in whichever supply you have won't start. If this proves to be the case, don't throw the vibrator away. And don't go looking for an NOS replacement on eBay as it will have the same problem for the same reason (see earlier posts having to do with vibrators in PE-237's or PE-97's, 117's and 120's). I offer a cheap service to fix most vintage vibrators. $5.00 plus shipping if the easy fix works. $10.00 if I have to do surgery and open it up to physically burnish the contacts. Or if you qualify as an ET or an EE over 55 I can tell you how to do it.
Third, as with the recent discussion about operating an RT-66/7/8 off of the mount, you will need to jumper pins J and H in Connector J-4 (the one marked REC-TR CONT). Else there will be no B+ to the 2nd Audio tube in the RT-70.
Gunner
USN Retired
MVPA 9480
USN Retired
MVPA 9480
-
- G-Command Sergeant Major
- Posts: 233
- Joined: Tue Dec 19, 2006 12:38 pm
- Location: Greece
Re: AN/VRC-7
i have one set complete in working condition. Please, anyone can tell me what elements i have to use in the AB-15 mast base for antenna? and what combination?
thanks
George
thanks
George
-
- G-Corporal
- Posts: 21
- Joined: Mon Oct 02, 2017 3:44 pm
- Location:
Re: AN/VRC-7
hi George, could you attach photos?
Tks
Tks
- wa5cab
- CWO4 (Ordnance) USNR
- Posts: 2064
- Joined: Sun Dec 29, 2002 11:22 am
- Location: USA/TX/Houston
- Contact:
Re: AN/VRC-7
Besides one AB-15/GR, the antenna for the AN/VRC-7 consists of one AB-22/GR screwed into the AB-15 and one AB-24/GR screwed into the AB-22. Coax between the RT-70 and the AB-15 is CG-530/U which in this case is made up of 50" of RG-62/U and two UG-260/U (BNC Male) or equivalent.
Robert Downs
Robert Downs
Gunner
USN Retired
MVPA 9480
USN Retired
MVPA 9480
Who is online
Users browsing this forum: No registered users and 14 guests